In my experience, the Bravo V2 does not properly drive headphones with higher impedance's. For example, I have tried it with Sony MDR 7506 cans (63 ohms) and Beyerdynamic DT770 Pro (250 ohms). In my experiment, the low end response of the Beyers just disappeared when the Bravo was inline. However, the Sony cans had much more impressive bass response (mine have the beyer earpad mod, but I don't think that was the sole contributor to such a huge difference). Check the frequency response on headphone.com, and you'll see that the Beyers should have beat the Sony cans in bass response. However, that presumes the cans are being properly driven. Try that Bravo with some lower impedance cans, and I would bet you'll hear a marked difference.