Originally Posted by
paskinner
The only issue I can see is that a 4ohm load will draw twice as much current , compared with 8 ohms, and thus potentially give the amp a harder time. But, as already said, the only useful test is to try it. Mind you, I would prefer a powered sub, because extra grunt is always fun when driving bass units.
A class d amp operates digitally, rather than in analogue mode. It will run cool and is very compact because so efficient. Some enthusiasts think they sound less good than a conventional analogue amp. But in truth, a good class D is fine.