They sound nice. Not "powerful in the bass", rather it might be a bit too lean and bloomy (not boomy) for some. More textured and rich bass, compared to the tighter Etymotic ER4S. Not as refined or precise overall, but the ER4S is hard to match. Much easier to drive than the Ety, so you're likely to get more bass than the Ety with some random jack. Very different, though nearly as hifi sound. Depending on the content or gear, they may sound a bit midrange recessed or bright, like with a crummy headphone jack and Dishnetwork's Sirius feeds. Brighter than the MDR-7509 (that's a nine) and more refined and transparent than the Sony, too. Their high detail lets you hear MP3 compression and whatever Dishnetwork is doing to channels like Area that screws it up so bad. With a better Sirus feed, like DirectTV's, they sound lovely. My Alesis and Allen & Heath mixers also makes them sound grand. For $129 they are a fair buy, but at $100 they were a steal. It's not exactly neutral in my opinion, but it's more neutral and a better tone than the vast majority of headphones a lot of studio folks have heard. I think it's an improvement to the warmer, euphonic 550 drivers, and at the very least a valid alternative sonic "taste". If you want even less bass, you can use the velours. But I think you'd have to be running them with a tube amp, or something, to justify that.