disturbed471985 5,000+ posts
CarAudio.com Veteran
Not only will it get hot its ***** alot more juice then a class d.I used to run a dual 4 ohm voice coil sub with a 4 channel amp, it was a 12" Bazooka P. Miller series and an old school MTX Pro504, actually worked pretty **** good.
One thing though, that 4 channel amp is gonna work pretty hard since it's running a sub and the lowest impedance it can handle so it'll get hot. My MTX overheated a few times while bumping Ghetto D.
A class D mono subwoofer amp is a better choice but hey if you already have the 4 channel laying around then I don't see why not.