Wouldn’t it be nice to have a really small car audio amplifier that would make lots of power and fit in the palm of your hand? Based on experience, we’ve come to expect that consumer electronics increase in power and capability while shrinking in size as new generations are released every year or so. For computers, Moore’s law has held true with a doubling of transistors in a computer processor every two years. That same philosophy doesn’t work for amplifiers. Here are a few things to think about before you rush out to buy a really small amp for your car or truck.

Car Audio Amplifier Efficiency

Mobile audio amplifiers need to have a heat sink because they are not 100% efficient. This lack of perfect efficiency means some of the power that goes into the amp is converted (or wasted) as heat rather than being output to your speakers. For a Class-AB amp, efficiency at 1/3-rated power might be around 35% and a Class-D amp would be up around 70%. Even at 70%, if the amp is producing 100 watts of power, it’s still turning 43 watts into heat.

This heat, if not controlled, will damage the components in the amp. To prevent this, amplifier designers attach heat-generating devices to a heat sink. Most modern amplifiers use aluminum extrusions to wick heat away from the transistors and MOSFETS that handle large amounts of current. The heat sink needs to transfer this heat into the air around the amp and as such, it needs to be a specific size for a given amount of energy transfer.

What Happens When an Amplifier Heat Sink Is Too Small?

Sadly, there are lots of amplifiers on the market that don’t have large enough heat sinks. What happens when these amplifiers get hot? Depending on how the amp was designed, it may simply turn itself off at a certain temperature. Some amps include circuits that reduce the voltage of the power supply in hopes of reducing the amount of power being wasted.

If you live somewhere that experiences high temperatures, or you listen to your music at high volume levels, have your local specialty mobile enhancement retailer help you choose an amplifier with a large enough heat sink that it functions reliably.

What Else Limits the Size of a Car Audio Amplifier?

Aside from needing enough space to physically house the power supply, signal processing and output devices, another factor that puts a limit on the size of an amplifier is having enough room for the various connections and controls required to make the amp work. Once a designer has found room for the power, signal and speaker connections, he or she needs to find room for sensitivity and crossover adjustments, as well as switches for crossover functions. Subwoofer amps often need a jack for a remote level control, and that space is part of the chassis design. If the amp needs bandpass crossovers, an infrasonic filter and signal routing switches, the end panels of the amp can very quickly run out of space.

Is a Small Car Audio Amplifier Better?

As we mentioned in our article about compact amplifiers, cramming a lot of circuitry in a very small space has some drawbacks. In almost every example we’ve seen, really small car audio amplifiers have worse signal-to-noise performance specifications than their larger counterparts. The last thing you want after having your mobile audio system upgraded is to hear hiss between songs.

Choose Reliability of Size

Unless you are trying to fit an amp into a very small location like the fairing of a motorcycle, you are always better off choosing a solution with a relatively large heat sink and, most importantly, great specifications. Drop by your local specialty mobile enhancement retailer today to audition the different amplifiers available to suit your car audio system upgrade.

Many new cars and trucks don’t come with a CD player. Music stored on our smartphones and the multitude of streaming audio services has, sadly, made compact disc technology almost obsolete. If you still have an extensive collection of discs, your local specialty mobile electronics retailer has a variety of add-on solutions to make it easy for you to enjoy your favorite music.

What Happened to the Compact Disc?

According to the Recording Industry Association of America, sales of compact discs peaked at just under 1 billion units in both 2000 and 2001. One of the key factors in the subsequent decrease in CD sales was the advent of peer-to-peer file sharing through programs like Napster. At the same time, the Apple iPod launched in 2001 and by 2005, iTunes song sales exceeded CD sales in Tower Records and Borders. The next hit was the advent of music streaming services like Pandora (based on the Music Genome Project) and Spotify. CD sales have now dropped to a level similar to that of 1986, and it’s reported that the sales of vinyl records have exceeded that of the compact disc.

Seeing this trend, vehicle manufacturers like Buick, Chevrolet, GMC, Cadillac, Chrysler, Dodge, Mazda, Subaru, Honda, Kia and Jeep have omitted a compact disc mechanism in their new vehicles. This omission not only reduces the cost of the infotainment system, but it also opens up valuable space in the center stack (the portion of the car dash that extends down to the center console) for larger displays.

Can You Add a CD Player?

Several companies have created add-on CD player solutions that connect to your factory radio using the USB port. These devices are special and uniquely distinct from a computer USB drive like an Apple SuperDrive or something from Asus or LG. The primary difference is that the software in the vehicle-specific drives is programmed to make the car radio think it’s connected to a media player. The audio tracks on your compact disc are presented to the radio in the same format as you’d find MP3 files on a USB memory stick.

Secondly, automotive compact disc mechanisms include suspensions that help reduce the chances of skipping and drop-outs as the vehicle goes over bumps.

Once the device is installed, you can slide a disc into the player and select the USB media source option on your factory radio. The tracks on the CD will show up the same way as if they were stored on a memory stick. It’s worth noting that you are unlikely to see the album, artist and song name on the screen.

Upgrade Your Car Stereo System Today

Whether you want to add a CD player or SiriusXM satellite radio, your local specialty mobile enhancement retailer will probably have a solution for your needs. Drop by and let them know what’s missing. They’ll do their best to help you out!

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.

If you’ve been following the changes in the mobile enhancement industry over the past few years, then you’re familiar with the steady progression of new floating-face radios. These radios feature an oversized touchscreen that mounts in front of a standard radio chassis to provide big-screen entertainment without the need for extensive and often expensive modifications to your vehicle.

Single-DIN Multimedia Receiver Screen Sizes

Around 1986, the first single-DIN flip-out multimedia receivers hit the market with a 5-inch color display. Many of these units required that the user flip the screen up manually once it extended from the dash.

Through the ’90s and 2000s, all the top head unit manufacturers had created fully motorized flip-out-display multimedia receivers with screen sizes up to 7 inches. These receivers featured touchscreen overlays that made selecting entertainment options quick and easy. Many of these radios also included GPS-based navigation systems and, in later years, support for playback of digital video formats like MPG and WMV and, of course, dedicated video inputs for backup cameras.

If your car or truck only had room for a single-DIN chassis, these radios or extensive modifications to your vehicle were your only options for adding a video screen to your dash.

Floating-Face Radio Solutions

As our industry has slowly moved away from the need for CD and DVD mechanisms in multimedia receivers in favor of support for digital formats, manufacturers have been able to shrink the size of the radio chassis. Expanding on these reduced hardware requirements on the radio has allowed companies like Sony, Alpine and Pioneer to graft oversized displays onto the single-DIN chassis to make viewing and controlling the devices even easier.

Taking their cues from such companies as Mercedes-Benz, Mazda and Tesla, these displays range in sizes from 8 to 11 inches.

Flexible Mounting for a Perfect Fit

Each manufacturer provides a number of mounting options to ensure that these large-screen radios will fit nicely and look good in the dash of your vehicle. The Sony XAV-AX8000, for example, includes 20 degrees of tilt angle adjustment, 20 mm of fore and aft flexibility and three vertical mounting options.

One thing you’ll want to keep in mind when choosing one of these solutions is screen stability. You want something that is rock solid. You don’t want the screen vibrating while you drive, and it needs to be solid and stable when you press on the touch interface to make a menu or source selection.

Upgrade Your Mobile Entertainment System Today

If you’ve been eyeing a new multimedia receiver for your car or truck, drop by your local specialty mobile enhancement retailer today and ask about the new generation of floating-face multimedia radios. The staff there can help you choose a solution that has the features and options you want, then arrange to integrate the system into your vehicle to make your commute to or from work or school even 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.

If you visit a new car dealership these days, you’ll notice more and more cars, trucks and SUVs with small touchscreen displays that are mounted in front of or above the dash. While these infotainment systems provide you with AM/FM terrestrial radio, SiriusXM Satellite radio and playback of all your favorite digital media files, these systems aren’t traditional car radios in the classic sense of the word. Confused? There’s no need to be; we’ll explain.

What is a Classic Car Radio?

For decades, the standard for car radios was a chassis that measured roughly 2 inches in height and 7 inches in width. This standard, known as ISO (International Organization for Standardization) 7736, was based on DIN (Deutsches Institut für Normung) 75490 or 180 mm by 50 mm. Although never popular in North American vehicles, ISO 10487 defined a set of standards for radio connectors and wire harness colors. The colors are used by all aftermarket radio manufacturers, but few adopted the connectors due to their large size.

Contained within these tight confines is a power supply, an AM/FM receiver and, depending on your age, possible a cassette player, a CD mechanism, along with support for digital media playback by USB or a combination of these technologies.

Where is the Radio in My New Car?

If you were to look for the “radio” in a new car, you might find a metal box with two or three multi-pin connectors on it. There isn’t likely to be a display affixed to the box, nor any controls. Referred to by Japanese head unit manufacturers as a “silver box” design, these radio modules interface with the controls and displays already built into the dash, center console and steering wheel of your vehicle. Depending on the design of your vehicle, these silver boxes may be mounted in the dash, under a seat or in the cargo area of the vehicle.

How Can I Upgrade My Car Stereo?

If you happen to have purchased a vehicle that is designed around a silver box radio, you can still upgrade your car stereo system. You won’t be starting with a new radio. Your upgrade will come in the form of better speakers, more-powerful amplifiers, a subwoofer or a digital signal processor. In the hands of a properly trained mobile enhancement retailer, every aspect of the listening experience in your car can be improved: clarity, detail, tonal balance, low-frequency extension and — of course — overall volume level. You just have to explain your goals and let their expertise guide you to the end goal.

What If I Want to Upgrade the Technology in My Vehicle?

Say, for example, that your vehicle didn’t come with Apple CarPlay or Android Auto. Companies like NAV-TV offer upgrades for Chevrolet, Buick, GMC, Cadillac, Lexus and Range Rover vehicles to add these smartphone interface technologies. More applications are always in the works.

Likewise, companies like VAIS Technology offer Satellite Radio interfaces that work with Toyota, Scion, Honda, Hyundai, Ford, Dodge, Chrysler, Jeep, Fiat, Nissan, Mazda, Porsche, Chevrolet, GMC, Mercedes, Volkswagen, Land Rover, Alfa Romeo and Subaru factory radios. They also have Bluetooth add-on modules for many Toyota and Lexus vehicles.

Finally, if your new vehicle didn’t come with a CD player, companies like Automotive Integration Solutions (AIS) have add-on solutions that work with your USB port.

Upgrade Your Car Stereo Today!

If the entertainment system that came with your vehicle doesn’t offer the features or performance you want, drop by your local specialist mobile enhancement retailer today to find out how it can be improved. They’d be happy to make your commute to work or school a little more enjoyable through new infotainment options.

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.

As we continue our deep-dive into the functions of car audio digital signal processors, we’ve reached the topic of crossovers. Many people overlook the importance of configuring crossovers properly to achieve a smooth frequency response. Let’s take a look at what a crossover does and why your technician must set them correctly to protect your speakers.

What Is a Crossover?

All speakers, no matter their size, have limits in terms of their ability to reproduce low-frequency audio information at high levels. For small speakers like a tweeter or midrange driver, attempting to produce bass is a recipe for disaster. Crossovers are used to limit the audio information being sent to a speaker above or below a set frequency.

High-pass crossovers allow information higher than the set frequency to go to the speaker. Low-pass filters do the opposite – they pass audio information below the crossover frequency.

High-pass filters are used to prevent bass and midrange information from being sent to tweeters. Low-pass filters are used to prevent midrange and high-frequency information from being sent to a subwoofer. For midbass and midrange speakers, we combine a high- and low-pass filter to create what’s known as a bandpass filter. A bandpass filter has limited low- and high-frequency information.

Crossovers have three defining characteristics: the crossover frequency, the attenuation rate and the type of crossover response curve.

Crossover Frequency

Depending on the response curve chosen, the crossover frequency defines the -3 dB or -6 dB point for the filter. When setting crossovers between midbass woofers, midrange speakers and tweeters, we want the output to sum flat – as though there were no crossover, and we had a single speaker that would play through the entire audio range. To achieve this, we need the crossover frequencies for both speakers to be the same.

Crossover Slope

The slope describes how fast audio signals in the stop-band are attenuated. A crossover isn’t a brick wall or a switch. Say you set a high-pass crossover at 3 kHz for a tweeter. You still get output at 2.5 kHz and 2.0 kHz. The rate at which that output attenuates is the slope. The slope is described by how much the output is reduced per octave away from the crossover point. The most commonly used slopes are -12 and -24 dB/octave.

Crossover Response Options

Some companies describe the shape of the filter response using different terms – alignment, damping or simply crossover type. These options describe the behavior of the filter around the crossover point and how the output sums with an adjacent filter. This is a topic that could fill a textbook, but suffice it to say that some types work better in car audio applications than others. Your technician should know what to use to achieve the flattest response and best speaker radiation pattern around the crossover frequency.

Choosing the Right DSP

Most of the high-quality digital signal processors on the market have very flexible crossover frequency, slope and response options. Where you need to pay attention is in choosing a DSP that has enough channels for your system, and in ensuring that any channel can be configured with any type of crossover. In some cases, manufacturers link channels together. While usually acceptable for conventional systems, linking presents limits when you want to drive a center channel speaker.

Lastly, and most importantly, you want to choose a technician who has the tools (a calibrated RTA) and the training to ensure that the crossovers that he or she configures for your audio system protect speakers adequately. Of course, the system also needs to be designed using speakers that complement each other and deliver smooth sound distribution throughout the vehicle. Start with your local specialty mobile enhancement retailer. Ask to hear some of their demo vehicles. Ask what RTA they use, how long they take to configure a system, and how they ensure it’s adjusted to suit your listening preferences.

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.