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Mobile Enhancement Experts in Milford CT

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What To Look for When Shopping for Motorcycle Audio Speakers

Motorcycle Audio SpeakersNow that the weather is great all across the country, motorcycle enthusiasts have a chance to get their bikes out and go for a ride – but many riders complain that the factory audio systems on their bikes don’t sound as good as they’d like. There are several reasons why, and a few relatively easy ways to upgrade these systems. A proper motorcycle audio system upgrade will include at least two components – an amplifier and a new set of motorcycle audio speakers. This article highlights a few things to look for when shopping for new motorcycle speakers.

Mother Nature is a Challenge

Unlike in a vehicle, when you are riding your motorcycle, your speakers are exposed to the elements. Sun, water, sand, dirt and debris are natural obstacles that can harm your speakers. When you are shopping for a new set of motorcycle audio speakers, you want to look for ones that are completely weather-resistant.

Motorcycle Audio Speakers
JL Audio rigorously tests their speakers for exposure to salt spray.

Water-resistant – Most speakers are made of plastics and metal. Within the motor structure of the speaker are ceramic or neodymium magnets bonded to ferrous metal plates. These metal plates must be protected from exposure to water. When it comes to coaxial speakers, there has to be a seal between the woofer cone and the tweeter post. If this seal does not exist, then water can get into the motor assembly and cause corrosion. In the marine speaker market, a test known as ASTM B117 exposes speakers to a salt fog spray to test for corrosion or material failure. If your speakers have this rating, you know you will have the reliability you are looking for to last for years.

Dust-resistant Design – Following the same theme as the requirement for water resistance, a motorcycle audio speaker should be able to operate reliably when dusty or dirty. A few specks of sand wedged between the voice coil former and the tweeter post of a coaxial speaker can wreak havoc on the performance of the system.

UV Exposure-rated – You want to look for a speaker that is constructed with materials that can withstand UV exposure. These plastics will not chalk, fade, crack or degrade, even after years of direct sun exposure. Having your speaker cones or surrounds fall apart after a few years on your bike is a frustrating experience. To confirm that the speakers you want to use are up to the challenge, look for ASTM D4329 testing. This test exposes the products to years of UV and heat exposure in a short amount of time. If they pass this test, you can trust they will work will on your bike.

Motorcycle Audio Systems Need Power

Motorcycle Audio SpeakersTo reproduce your music at a volume level that can drown out the wind and overcome the noise of a loud exhaust, you need power. Adding an amplifier to your bike is a necessity to achieve adequate performance. Your new speakers have to handle the power from your amp.

The voice coil is the motor of your speaker. It converts the electrical signal from your amplifier into a magnetic field that pushes or pulls the speaker cone forward or backward. If you are sending a lot of power to the voice coil, it has to be physically large enough to dissipate the heat that is generated. Look for large-diameter voice coils; they act like the radiator in your car.

Can Looking at the Tweeter Tell Me Anything?

Motorcycle Audio SpeakersThere are some strong stereotypes associated with hard- and soft-dome tweeters. Many say that hard, metal dome tweeters sound harsh and that soft-dome tweeters sound smooth and laid back. After listening to thousands of speakers, we can tell you that as many examples of each type of tweeter confirm this theory as oppose it.

No one single material selection can determine what a speaker sounds like. Every component in a speaker works as part of a system. The cone, surround, spider, voice coil and magnet structure all have an important role in determining the resulting performance of a speaker. The only way to know how a system sounds is to listen to it. That said, choosing materials that offer weather resistance and long-term reliability is crucial.

Where to Buy Your Motorcycle Audio Upgrades

We have seen many people buying bolt-on audio system upgrades at shows like Bike Week or Thunder Beach Fall Rally. The people selling products at these events may even offer to install them right at the show. Convenience and instant gratification are wonderful, but what happens when it comes to after-sales support? What if a speaker fails? What if you take the kit home and something doesn’t fit? You will have to track down the vendor and, unless they are local to you, pay someone to remove and replace the failed component.

When you deal with a dedicated retailer with a “brick and mortar” storefront, you know you will have the after-sales support that you want and deserve. If you have a question or concern, or decide you want additional upgrades, your retailer is there to support you every day.

Stick to the Big Names

If someone approached you at a cruise and said, “Hey, I designed these cool tires in my basement, do you want to try them?” – what would be your response? Unless this last person’s last name is Dunlop or Pirelli, you are going to be skeptical. That is a good thing.

You bought a Honda Goldwing, BMW K1600, or Harley-Davidson Road Glide or Street Glide because you are confident in the process that those manufacturers have put into developing and testing their products. Decades of engineering, design and innovation produce increasingly reliable and higher-performing products each year. Audio components are the same. A small company can go to Asia and have its name put on an order of speakers, but does anyone know what you are getting for your money?

Motorcycle Audio SpeakersDealing with a reputable brand ensures that you will have product support long after the sale is complete. You are getting the latest technologies for incredible performance. FEA design analysis, Klippel testing, fanatical quality control and continued research are all hallmarks of dealing with a premium brand. Why take a risk with your audio investment?

Upgrade Your Motorcycle Audio System Today

When it is time to upgrade your existing audio system or add a new system to your motorcycle, visit your local mobile electronics specialist retailer. They have the products and experience to design an audio system that will sound great and be reliable for years to come.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: RESOURCE LIBRARY, ARTICLES, Motorcycle Audio

Hot Rod, RestoMod, and Restoration Source Unit Options

Hot Rod, RestoMod, and Restoration Source Unit OptionsThe stereotypical image of a “Woody” station wagon with a surfboard on the roof is missing one critically important element to make it part of the perfect day on the beach: an audio system. In the 1960s, the aftermarket car audio scene was weak. Compared to now, there weren’t any options for source units, speakers or amplifiers, and certainly nobody had a subwoofer. All of that has changed. Today, aftermarket car audio upgrades can transform your daily driver or project car into something stunning. Let’s think back to our mental image of a ’60s Chevy Woody wagon, but update it with modern speakers, amplifiers and – of course – a new source unit. This article discusses some of the source unit options available to people who are restoring a classic car, building a hot rod or doing anything in between.

Modern Convenience and Performance

Source Unit OptionsIf you are building a street rod or are willing to take some liberties with the look of your dash, then cutting an opening for a single-DIN radio or making a console for a double-DIN radio provides you with an excellent opportunity to have all the latest features and technologies right at your fingertips.

Bluetooth hands-free calling is essential to your safety when on the road. Audio streaming will let you play music from your smartphone or a streaming service wirelessly to your radio. Digital media file playback provides you with a way to access your modern MP3 music collections. Finally, navigation systems can help get you where you want to go quickly and safely.

Many modern radios have the ability to change the color of the controls and the display. You can match the color of your radio to a set of incandescent bulbs in the gauges of a ’30s roadster or the blue glow of a set of new digital gauges. Some people set the radio to match the color of the car.

Contemporary Performance and Classic Style

Several manufacturers produce modern radios with traditional twin-shaft mounting systems. These radios include features like USB ports for your digital media collection or your Apple iPod or iPhone. Bluetooth audio streaming and hands-free calling functions are standard on many models, and SiriusXM satellite radio connectivity will let you enjoy genre-specific programming from coast to coast.

These radios feature vintage styling with simple LCD and LED displays where the old analog tuner used to be. Multi-function knobs on either side of the primary display handle controls for volume, tuning and source selection functions. These radios include between 18 and 25 watts of power from the built-in amplifier and have pre-amp outputs for adding external amplifiers.

Connectivity with the latest devices may not be as up to date as with a modern aftermarket radio, but these vintage radios can conceal themselves well in your dash.

The Hidden Radio Solution

Source Unit OptionsIf you are working hard to keep the interior of your vehicle looking original, then your best bet is not to show off a new radio at all. Some people will mount an aftermarket radio in the glove box or under the front seat. These radios are still accessible while you’re driving, but not as easily.

For several years, the hot ticket was to install a marine radio in the trunk or a storage compartment. The driver would have access to a wired remote control to change the volume or source. These marine remotes often include small displays to let you know what station or track you are enjoying.

Modern marine source unit remote solutions include IR and RF remotes, as well as iPod or iPhone remotes that use WiFi for communication. You can use your radio quite easily without being able to see it at all.

Custom Remote Control Solutions

One “trick” that people often forget about is to use an OEM steering wheel audio control interface with a set of custom switches to control the radio. Your installer can program a set of switches with unique resistor values to perform almost any function you want. A spare four-way power window rocker switch makes a great volume and track selection control. You could use power window and power lock switches on a door to perform similar functions. The options for custom remote controls are nearly endless.

“Radio? We Don’t Need No Stinkin’ Radio!”

Source Unit OptionsThe modern smartphone has started to replace radios altogether in some projects. Being able to stream radio stations over the Internet or use services like Pandora or iHeartRadio makes your cellphone and its wireless Bluetooth connection the only source you may need.

In the most basic of applications, your installer can connect a stand-alone Bluetooth receiver to a small amplifier and new speakers. The volume control on your smartphone will serve as the master volume control for the sound system. The system will power up as soon you connect to the Bluetooth module and start streaming audio.

If you are after a better-sounding system, then you may want to look at a signal processor with an optional Bluetooth streaming module. Several digital signal processors (DSPs) on the market can stream high-quality audio directly without the need for a source unit. The audio processing functions of the DSP will allow your installer to maximize the performance of each speaker in your system and create an amazing sonic experience.

Shop Local for Your Source Unit Options

Before you get too deep into your restoration or project build, contact your local mobile enhancement retailer today to discuss suitable source unit options for your vehicle. They will be able to explain the benefits of each system and provide you with all the information the restoration shop you are working with will need to bring the concept to fruition. No matter what source unit option you choose, having great speakers and amplifiers in your classic car or hot rod will make going for a cruise much more enjoyable.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Car Audio, Classic Car Audio, RESOURCE LIBRARY

Product Spotlight: Drone XC-LTE Dash Cam

Drone XC-LTE

If you’re a regular visitor to BestCarAudio.com, you should be familiar with dash cams and smartphone-based remote vehicle control solutions like Drone. Imagine combining the features of both units into one product and then adding live video streaming capabilities! The new Drone XC-LTE 2K QHD dash cam with LTE, GPS and Wi-Fi does precisely that. Let’s check it out!

What Is the Drone XC-LTE Dash Cam?

There are a lot of features and design elements to unpack with the Drone XC-LTE. The unit has a footprint of 4.2 by 2.8 inches with a thickness of 1.5 inches. A vertical mounting orientation on the windshield minimizes obstruction.

Drone XC-LTE
The XC-LTE mounts vertically on the windshield to stay out of your line of sight.

The XC-LTE uses a Sony STARVIS image sensor for excellent contrast and low-light performance. The sensor is mated to a wide 154-degree lens to allow recording well off to the sides of the vehicle. The camera records at a 2K Quad HD resolution of 2560 by 1440 pixels at 30 frames per second. A built-in Wi-Fi transceiver lets you download stored videos to your smartphone.

Firstech includes a high-quality 64 GB microSD memory card to ensure reliable recording. Upgrading to a 128 or 256 GB memory card allows the system to store more data. The system also accepts a secondary camera input signal. Your installer can add the XC-RC100 rear-facing or the XC-IR100 infrared interior cameras. The interior camera is very popular with taxi, Uber and Lyft operators. The parking mode feature allows it to monitor the visible area continuously and then record when something or someone enters its field of vision.

Drone XC-LTE
The optional XC-RC100 rear-facing camera allows the Drone XC-LTE to capture video of what happens behind your vehicle.

What makes this dash cam unique is the ability to view live video on the DroneMobile app on your smartphone using an LTE cellular data connection. You can see exactly what the camera sees on your phone. The system uses an LTE data connection to transmit video. As long as your phone can access the cellular data network, it doesn’t matter where it’s parked or driving. Remote live-viewing capability is a feature people have been requesting for years.

Drone XC-LTE
The DroneMobile app provides access to a live video feed from your Drone XC-LTE dash cam.

Regarding live-feed details, the video stream has a resolution of 960 by 540 pixels. Depending on your chosen service package, you get 1 or 2 GB of cloud storage for important videos you tag via the DroneMobile app.

Drone Vehicle Control

While the excitement of the remote video viewing is the highlight of the Drone XC-LTE, it’s crucial to remember that this is still a Drone vehicle control interface. When paired with a compatible control module from Compustar, Arctic Start, FTX or NuStart, you can use the DroneMobile app on your phone to lock and unlock your vehicle or start the engine. You can even pop the trunk or open a sliding door or motorized hatch in many applications.

Drone XC-LTE
The updated DroneMobile app retains lock, unlock, remote start and auxiliary control features.

The Drone XC-LTE acts like the DAS-II sensor to detect impact, tilt, motion and glass breakage. Any of these triggers will instantly send a notification to your smartphone. You can use the LTE streaming feature of the dash cam to look around your vehicle to find out what’s going on. The DroneMobile app also allows you to trigger the Panic feature to scare away would-be thieves or the neighbor’s cat.

Drone XC-LTE
The Drone system pushes security alerts to your smartphone so you’ll know immediately when someone is tampering with your vehicle.

The system also functions as a vehicle-locating or -tracking solution with one of the GPS-enabled Drone service plans. You can configure speed-based warnings to monitor vehicle operation. Location-based notifications, often called geofencing, are also available. These warnings tell you when the vehicle enters or exits a specific area or location.

Drone XC-LTE
The Drone’s GPS receiver provides location and speed-based warnings on your smartphone.

See Why Your Car Alarm Triggered

Most of us are familiar with hearing car alarm sirens, getting a security alert from a two-way remote key fob or perhaps seeing an alarm notification on our smartphones. We all want to know what is happening in and around the vehicle. With the new XC-LTE, you can open the DroneMobile app and see what the cameras see in real time. There’s no need to leave the house or your office. You could be on vacation in the Caribbean and check on your car or truck from the pool while sipping a mojito or enjoying a beer.

The XC-LTE is ideal for commercial equipment left on a job site or in a company-owned service or delivery vehicle. The XC-LTE is a perfect solution if you rent your car or truck on Turo or Getaround and want to see where and how the renter uses your vehicle.

The Best Vehicle Monitoring and Control Solution

The Drone XC-LTE is the first aftermarket dash cam solution with live view capabilities that can integrate with a car alarm or remote start system to provide vehicle control and monitoring. You can also use the system as a stand-alone dash cam with remote live viewing. Your local Compustar retailer can explain the remote control and live-view service plans and the features they offer. To find an authorized Drone retailer near you, use the locator tool on their website. For more information about Drone solutions, visit their YouTube channel, Facebook page or Instagram. Check back frequently, as a full Test Drive Review of the Drone XC-LTE is coming soon.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Driver Safety, PRODUCTS, RESOURCE LIBRARY, Vehicle Security Tagged With: Arctic Start, CompuStar, DAS-II Sensor, Dash Cameras, DroneMobile, Firstech LLC, FTX, Getaround, LTE, Lyft, NuStart, Sony, Turo, Uber

Automotive Battery Science: How Batteries Work

Automotive BatteryYour automotive battery is one of the most important, and most often overlooked, electrical components in your vehicle. If your battery is not in good condition, you can be stranded, and other components in your vehicle may be damaged. This article discusses how batteries work and how to take care of them.

What is Inside an Automotive Battery?

Automotive BatteryInside a typical car battery are six smaller energy-producing components called cells. Each cell contains a series of electrodes or plates. The positive plate of the battery is lead [eroxide (PbO2). The negative plates of the battery are pure lead in a soft, sponge-like state. The plates within each cell are arranged in alternating layers for a total of 16 components. All of the positive plates in a cell are wired in parallel, as are all of the negative plates.

Each cell produces roughly 2 volts of electricity. The six individual cells are wired in series with one another so the voltage generated by each cell adds together. The result is 12 volts.

Are You Ready for the Chemistry?

A diluted solution of sulfuric acid (H2SO4) surrounds the plates. The ratio of acid to water (H2O) is typically in the region of three parts of water to one part of acid.

When we connect a load to the external terminals of the battery, a chemical reaction starts to take place. Our diluted sulfuric acid mixture comprises H2SO4 and water (H20). As the reaction commences, the sulfuric acid splits into positive hydrogen ions (2H) and negative sulfate Ions (SO4).

Automotive BatteryWhen the hydrogen ions reach the lead peroxide plate, they absorb electronics from it and become a hydrogen atom. This process attacks the lead peroxide to produce lead oxide (PbO) and water (H2O). The lead oxide reacts with the sulfuric acid to form lead sulfate (Pb SO4) and water (H2O).

Negative sulfate ions move freely within the solution. As they reach the pure lead plate, they give up their extra electron and become what is known as a radical sulfate. As a radical sulfate cannot exist on its own, it will attack the pure lead plate to produce lead sulfate (PbSO4).

The action of positive hydrogen ions taking electrons from the lead peroxide plate, and the negative sulfate ions giving electrons to the pure lead plate produce an electron imbalance. These electrons flow through the external load to try and balance themselves. This process is how the battery provides power to our load (light, amplifier, heater or computer).

The Chemistry behind Battery Charging

Automotive BatteryWhen we apply an external DC source to the battery, we reverse the process. An external DC source such as an alternator or a battery charger feeds electrons to our positive lead sulfate-covered lead peroxide plate and the negative lead peroxide-covered lead plate. During the charging process, the density of the sulfuric acid solution falls, but we still have positive hydrogen ions and negative sulfate ions.

The positively charged hydrogen Ions more toward the negative terminal of the external DC source. Each hydrogen ion takes one electron from the negative plate to become a hydrogen atom. These hydrogen atoms attack the lead sulfate to produce lead and sulfuric acid.

The negative sulfate ions move toward the positively charged plate. When they get there, they give up their extra electron to become radical sulfates. This radical sulfate reacts with the lead sulfate, and forms lead peroxide and sulfuric acid.

We Can Simplify that a Lot!

In a nutshell, the negative terminal of a lead-acid battery has an over-abundance of electrons. When you connect a load to the battery, the electrons scramble through the load to get to the positive terminal. This electron flow is what allows the battery to provide energy to do work.

When we apply a voltage to the battery that is higher than its resting voltage the electron flow reverses. The sulfate layers on the plates are converted back to lead and sulfuric acid.

Battery Charging: Calm Down – What’s the Rush?

About the worst thing you can do to a car battery is to rush the charging process. If you rush the recharging chemical reaction, the lead sulfate will heat up and adhere permanently to the lead and lead peroxide plates. Once it is stuck there, we can no longer use that area of the plate to flow electrons, and we have reduced the effective size of the battery.

Automotive BatteryYou probably have heard the expression “a battery is never the same after it has been killed.” This statement is very true if the battery is not charged gently and thoroughly.

When you want to recharge your battery properly, keeping the process slow will allow the chemical reaction to take place at a controlled rate. If you are using a high-quality, computer-controlled charger (and you should be!) there are two major charging stages. The first stage is called bulk charging. The charger will maintain a constant current flow to the battery by adjusting the applied voltage.

How do you know if you are charging a care battery too quickly? Standard flooded batteries should not exceed roughly 120 degrees Fahrenheit during charging. We suggest that slower and cooler is always better. An absorbed glass mat (AGM) or gel battery should not exceed 100 degrees.

Once approximately 80% of the used energy has been returned to the battery, the charger will switch to the absorption stage. At that stage, the charger provides a constant voltage to the battery and the current flow diminishes as the battery reaches full charge.

How to Calculate Maximum Battery Charging Rates

A relatively large car battery may have a capacity of 70 or 80 amp-hours. This specification means that under ideal conditions, you can draw 1 amp of current from the battery for 70 or 80 hours. After that time, the battery will be considered dead.

To find the ideal charging rate for our 70 amp-hour battery, we divide this specification by 10 to get seven amps. The battery should be able to accept 7 amps of charging current without overheating. It is worth noting that, if the battery is completely discharged, it will take 10 hours to charge it. Remember, slower is better when it comes to charging batteries.

Taking Care of Your Car Battery

Automotive Battery
The CTEK charger is a great charger to keep your battery operating at its potential.

Some of us who are more fanatical about the care and maintenance of our car batteries will connect them to intelligent battery chargers several times a year. One rule of thumb is to charge your battery fully after each oil change, or four times a year. You should increase this frequency if you make short trips that do not provide adequate charging time. Likewise, time spent playing your audio system with the engine off can drain a battery very quickly. If you have been out with friends and your car battery has been depleted, put it on a high-quality charger overnight.

If you can access the acid solution in your battery, ensure that it is at the proper level, or at the very least, is covering the lead plates completely. A hydrometer should be used to confirm the specific gravity of the solution, but if it is low, adding distilled water is better than doing nothing. That little green “eye” included in some batteries is a hydrometer. When it disappears, the chemical balance within the battery is off and it needs to be charged.

Your local mobile electronics retailer may have a battery load tester that they use before every remote car starter they install. If you are concerned about the condition of your battery, ask them to check it. Being stranded due to a dead battery when the temperatures get cold is frustrating if you are trying to get home or to work.

Ensure the battery terminals and connections to your vehicle are clean and secure at all times. A loose connection can have a dramatic adverse effect on the functionality of your electrical system.

If you need a new battery, check with your local mobile enhancement retailer first. They often have extensive experience in upgrading batteries and can help you choose a solution that will ensure your car is ready to go every time you turn the key.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Car Audio, RESOURCE LIBRARY

RCA Y-Cables, Friend or Foe?

RCA Y-CablesIf you spend any time reading car audio discussions on Facebook or in forums, then you will have undoubtedly come across comments involving the supposed drawbacks of using RCA Y-cables. There seems to be a lot of misconception or misunderstanding about how preamp signals works, and this misinformation leads to comments that aren’t always accurate. Let’s take (more than) a few minutes to clear things up.

Understanding Preamp Level Audio Signals

RCA Y-CablesThe audio signal that connects your source unit to your amplifier is both very weak and quite small. The voltage of the preamp signal is rarely above 10% of the maximum voltage capability of your source unit for several reasons. Firstly, the signal level is directly proportional to the output of the system. When the volume is low, the signal is low in amplitude.

The second factor that contributes to the microscopic amplitude of the preamp signal is known as the Crest Factor. By way of a formal definition, the Crest Factor is the ratio between the peak signal amplitude and the RMS value of a waveform. For a pure sine wave, this value would be 1.414. For music, the Crest Factor value is much larger.

We analyzed a few different songs to come up with some relatable numbers. The new song Run by the Foo Fighters has a maximum amplitude of +0.15 dB and an RMS amplitude of -12.7 dB over the entire track. To keep the math simple, let’s call it 13 dB, which is a ratio just shy of 20:1. We also analyzed Heathens by Twenty One Pilots and found that it has a Crest Factor of 10.5 dB, or just about 11.25:1.

If we think about the highest voltage possible on our preamp signal as being 4 volts, then the average voltage for the above track would be 200 millivolts and 355 millivolts respectively. The peak of 4 V only happens when the volume is at maximum. Don’t forget that.

Scotty, We Have No Power!

Another characteristic of our preamp signal is that it contains almost no current flow. As with any electrical circuit, the amount of current flowing through the circuit is determined by the voltage in the circuit and how much resistance there is. The output impedance of most head units is between 300 and 500 ohms. The input impedance on most amplifiers is about 10,000 ohms.

Using our maximum voltage of 4 volts, and a resistance of 10,500 ohms, the maximum current in our circuit will be 0.381 milliamps. If we consider that the average signal amplitude is about 275 millivolts, then we have an average current flow of 0.0275 milliamps. That is nothing.

What does an RCA Y-cable Do?

RCA Y-CablesAn RCA Y-cable allows you to connect a single RCA output to two RCA inputs. Typical applications for Y-cables are a single subwoofer output RCA on a source unit or processor and the need to feed a pair of inputs on a subwoofer amp. Another common application is a source unit with only a single left and right RCA output; you want to use a four-channel amp that doesn’t include a two-input/four-input switch.

Please Don’t Believe the Hype

The biggest myth about the use of Y-cables is that they dramatically reduce the signal going to each input. To prove why this is not true, we need to understand how a voltage divider circuit works. Yes, it is time for a little physics and math.

In an ideal situation, when we have a signal source and a single load, all the voltage developed by the source appears across the load.

RCA Y-Cables

If we have multiple loads, the voltage produced by the source is divided among the loads when they are wired in series. In the image below, we have two loads in series with our single signal source.

RCA Y-Cables

If the resistance value of the two loads is the same, then the voltage produced by the source is divided equally across the loads. Half the voltage can be measured across each load. Using our 4 V preamp example, we would see 2 V across each load. However, what happens when the load resistance is not the same? We have to do some math to determine how much voltage is across each.

Let’s label the loads. The load on the left will be called Rs. This is the resistance of our source. For this example, we will use a value of 500 ohms. The load on the right will be our amplifier input resistance of 10,000 ohms, and we will call it Ra1.

RCA Y-Cables

We have 4 volts being produced by the source and a total circuit resistance of 10,500 ohms. We can calculate that the current flowing in the circuit is 0.0381 milliamps using Ohm’s law. Knowing the current in the circuit allows us to determine how much voltage is dropped across each resistance. For our source load, we have a resistance of 500 ohms with a current of 0.381 milliamps to produce 190.476 millivolts. The rest of the 4 V source signal or 3.809525 volts appears across the load.

Let’s wire another amplifier in parallel with our first amplifier. This is the same effect as using a Y-cable. Our second amplifier will be called Ra2.

RCA Y-Cables

Now it is math time again. This time, our circuit has a total resistance of 5500 ohms, and as such, has a current of 0.7272 milliamps flowing in it. The voltage dropped across the source has increased to 0.363636 volts, and each amp is seeing 3.636 volts. That seems like a noticeable difference, doesn’t it?

The Decibel Scale Changes Everything

Between the two examples above, we have seen a decrease in voltage at the amplifiers by 4.772%. Does that mean our music is almost 5% quieter? No. When we talk about the ratio of voltage to volume, we need to take into account the decibel scale. Our decrease of 4.772% percent in voltage works out to -0.405 dB less output.

Before you get your knickers in a knot, you can fix that by turning the gain on your amplifier up by that amount.

A Worst-case Mathematical Example

RCA Y-CablesThis example was a worst-case scenario. What if you have a source unit with a lower output impedance? Some head units have an output impedance of 300 ohms. For that head unit, with the same 10,000 ohm input impedance on the amplifiers, the change in output by using a Y-cable would be -0.2493 dB. If you have a premium line driver in your system, the output impedance may be as low as 50 ohms. In this scenario, the loss is a paltry -0.0431 dB.

What did we learn from this? If you need to connect many amplifiers to a single source, then choose a source with a low output impedance.

RCA Y-cables as a Solution are Not Evil

If your system requires that you use a set of Y-cables to distribute the audio signal to multiple amplifiers, then go right ahead. Once your installer sets the sensitivity controls on your amps, you will never, ever know they are there.

If you have any questions about the design of your audio system or what to know about how your installer will be wiring it, talk to the salesperson and your local mobile electronics specialist retailer – they would be happy to explain things to you.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Car Audio, RESOURCE LIBRARY

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Factory Source Unit

To Get Better Sound, Do I Need to Replace My Factory Source Unit?

May 4, 2025 

Not all that long ago, upgrading the performance of your car audio system required that you replace the factory source unit. The industry had dozens of premium CD receivers with … [Read More...]

Testimonials

Very Friendly Staff

Very friendly staff, knowledgeable group . Needed help on my remote starter, they got me back up and running in no time . They also do amazing tint jobs!!

I recommend then to everyone!

Super great place to get lots of custom things done. Very nice, very knowledgeable and very fare prices. I recommend to everyone I know.

Will be going back for sure!

Very happy with how the tint came out. Professional and friendly. Will be going back for sure.

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Location

55 Woodmont Road, Milford, CT 06460

Get Directions to Speed of Sound Technologies

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Services

  • Car Audio
  • Custom Installation
  • Driver Safety
  • Radar/Laser Detectors
  • Remote Starters
  • Truck Accessories
  • Vehicle Security
  • Window Tint

Hours

Monday, Tuesday, Wednesday, Thursday, Friday9:00 am – 6:00 pm
Saturday9:00 am – 5:00 pm

Closed
Sunday

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