If you're on a pretty tight budget, look into a set of these. I bought them at a Walmart while I was on the road for work for ~$40. They're on-ear, which is my only complaint with them. I prefer over-ear. I picked them up to use with an old headphone amp I have. Low frequencies are not an issue for them. Low-B on a 5-string bass with decent volume without any distortion. I will say that they're not as good coming from my PC. Whether that's because the lower power output from my computer speakers' headphone jack, or the EQ on my PC I don't know. But they definitely don't rattle my skull like they do coming from my headphone amp, but they're adequate given the price. I'm not recommending them as the end-all, be-all. Especially if you've got a significantly larger budget. But bang-for-the-buck, I've been pretty happy with them and I know they'll produce damn-good bass if fed a decent signal.
