Mono vs 4-Channel vs 5-Channel Car Amps, Explained

What a channel is

Each channel is one output that powers one speaker, or one group of speakers wired together. A 4-channel amp can power four door speakers. A mono amp has one channel, built for subwoofers.

Many amps can be bridged, which combines two channels into one stronger output. That is how people run a small sub off two channels of a 4-channel amp. It works, but a dedicated sub amp usually does the job better.

Mono amps: built for subwoofers

A mono, or monoblock, amp is designed to push a lot of power into a low impedance load, like 2 ohms or 1 ohm. That is what subwoofers want. Mono amps also have a low-pass filter and often a bass boost and subsonic filter.

Match the amp's rated RMS power at your sub's final impedance, not the peak number on the box.

4-channel amps: for your speakers

A 4-channel amp powers front and rear speakers, or front components with the rear channels bridged to something else. Each channel has a crossover, so you can keep the deep bass out of your door speakers and let them play cleaner and louder.

5-channel amps: one amp for everything

A 5-channel amp is four speaker channels plus a mono sub channel on one chassis. You run one power wire, one ground and one remote wire. That saves space and install labor.

The tradeoff with any 5-channel is that the sub channel is shared with the rest of the amp's power supply, so if you want huge bass, two separate amps may be better.

RMS, ohms and wiring

Ignore peak watts. RMS is the continuous power the amp really makes. Check it at the impedance you will run. An amp might make twice the power at 2 ohms that it makes at 4 ohms.

The power wire gauge, fuse and ground matter just as much as the amp. A weak ground causes heat, noise and amps that shut off.Tell us your speakers and sub and we will match the amp.