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They do, and a healthy bass boost. They isolate like no other though. The only other IEMs that I've used that come close are Shures.

Yeah, I was going to menton Etymotic as well.. easily my favorite in-ear isolating headphones.

I have the HF3s and while of course they sound better with an amp (I use a FiiO E7 at home), it's not necessary. I use them without one at work and while walking around and they're still great.

I've had my ER4's for eight years now. They're the only headphone I've heard that sounds almost exactly like my beloved NHT 2.5i speakers. After listening to the Etymotics, virtually all other headphones sound wildly inaccurate, and the ones which claim to have great bass response just sound muddy and distorted.