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The Reference Fit line of amplifiers from Kenwood Excelon packs a ton of power into a small chassis. These amps hit hard and can fit into tight spaces, if needed. And with mono, 4-channel, and 5-channel versions available, you're sure to find one that fits into your car audio upgrade plans.

The Alpine PDX-V9 is the "do it all" version of Alpine's popular digital PDX amps. It's small, stackable with other PDX amps, and gives you 100 watts RMS x 4 for your speakers, plus 500 watts RMS x 1 to drive a sub. Serious power, with a tiny footprint.

While at CES 2012, we got the inside scoop on the new Kenwood Excelon line of amplifiers - three models featuring a small footprint, clean design, and covered by a reassuring 2-year warranty.

Sony's efficient GS car amplifiers give you clean, effective power to make your car audio system sing. There are two GS models: a 4-channel, and a mono subwoofer amp. Both feature RCA and speaker-level inputs and are backed by a 3-year Sony warranty.

Video: Focal FPS amplifiers
by Zak Billmeier

For the best amplified sound in your car, turn to Focal. This brief video introduces the Focal FPS series of amplifiers.

Now that the front door speakers were in  -- and we could ably demonstrate the difference between the front aftermarket and rear factory speakers -- it was time to install the new...

An amplifier is your key to enjoying the best musical experience you'll ever have in your car. Installing one is a cool project - getting to know your car inside and out is often fun and satisfying. This article presents five important tips to help achieve a successful and problem-free installation.

We're passionate about car audio. Crutchfield's Mobile Audio Listening Lab lets us get hands-on experience with all kinds of car audio gear, from speakers and subs to amplifiers and receivers.

Ben H's 2003 Toyota Camry LE
by Dominic Devito

Ben H. from Palm Harbor, FL, wanted to get the most out of his 2003 Camry LE, so he pumped up his sound system with two pairs of Sony speakers, a slamming enclosed subwoofer from Boston Acoustics, and a powerful Kicker amplifier. He also tricked out the car's interior lighting.

Daniel M's 2002 Mercury Cougar
by Dominic Devito

Daniel M. from Delmont, PA, added a new Kenwood stereo and Infinity speakers to his sleek 2002 Mercury Cougar. After he discovered his speakers were underpowered, he went whole hog and added a 4-channel Kicker amplifier, plus a pair of Rockford Fosgate subs, each with their own Kicker amp.

Kicker's Yellow Series of amps, speakers and subs gives you the performance you expect from Kicker at a more affordable price. And this year's models are better than ever.

In Part 2 of our Car Stereo Proving Ground series, we added a bass system (subwoofer and amp) and an amplifier to the speakers. Anyone who's ever done this won't be surprised to hear that the music opened up and sounded better. What really impressed us? Read on....

Adding an amplifier to your car audio system doesn't just make it louder - it makes every instrument sound clearer, it makes subs hit harder, and helps raise your soundstage to head level. Check out this overview of a typical installation to see the steps involved when you install an amplifier in your vehicle.

Crutchfield Advisor Kramer equipped his 2009 Honda Element with a budget-friendly sound system. The system is built around a Kenwood receiver, complemented by Infinity speakers, and two amps and a sub from Alpine.

Video: setting your amp's gain control
by Robert Ferency-Viars

Check out our quick and easy method for properly setting the gain on your car amplifier. This simple adjustment will have you on the road to stellar sound.

Make your music sound lively and vital with a Sound Ordnance amplifier. Watch this Crutchfield video for a quick overview of what these amplifiers have to offer.

Video: Upgrading Your Factory Stereo, part 2
by Robert Ferency-Viars, Ken Nail

Just because you can't replace your vehicle's factory stereo doesn't mean you have to live with a poor sound system. In this short video, Crutchfield experts take a look at how a fellow employee created a high-performance car audio system.

This video demonstrates how easy it is to install the Alpine KTP-445 Power Pack amplifier module. The Power Pack gives you the power and improved sound of an external amplifier at a fraction of the cost and with a much easier installation.

Subwoofers FAQ
by Crutchfield Writing Team

Which hits harder: one 12" sub or two 10" subs? How much power do I need? What difference do cone materials make? The answers to these and many other questions can be found in Crutchfield's Subwoofer FAQ.

Video: car amplifier build quality
by Zak Billmeier, Ken Nail

If you can get the same amount of power from two different amplifiers, is there any reason to buy the higher-priced amp? What are you getting for that extra money? We'll discuss the differences in build quality and performance between lower-priced amplifiers and more-expensive options.

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