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Video: car amplifier channels
by Zak Billmeier, Ken Nail

How many channels you'll need for your amp depends on how you intend to use it, and with how many speakers or subs.

Car amplifier buying guide
by Buck Pomerantz

How much power and how many channels are right for you? This guide will help you choose the right amplifier for your car's sound system.

Video: how to choose an amplifier
by Zak Billmeier, Ken Nail

Here are some major points to consider and features to look for when choosing a new amplifier, like how many channels, or how much power it needs.

Why bi-amp your speakers?
by Kramer Crane

Using a 7-channel receiver to power five speakers? That extra power need not go to waste. See how to put the two unused amplifier channels to work for better sound.

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