I think I'm after the same bass impact. I listen to a lot of classic rock and heavy metal (Pantera, Lamb of God, Devil Driver, System of a Down, Twelve Foot Ninja...) I've found that the Hifiman HE4XX give really good detail, clarity to vocals, and reduced sharpness/harshness. But I feel like...

Awesome. So would you choose say the AKG K371 over the 6xx adam upgrade?

I don't have either. I'm asking more for learning purposes. Love the car comparison. What I'm most curious about is any sort of specs or qualities to be reading up on for research that would tell me if they're good.(besides what ohms they can drive and the battery life) Also, someone on another...

More specifically, why are portable amps like the Aune B1s priced at $100.00+ when there are portable amps like these for $25.00 ? They both can run very high impedance headphones and the cheaper one seems to have a longer lasting battery. What am I missing?

Thank you for such a thorough response man. I'll be sure to check out some Grados if given the chance. Need to find a headphone shop first. Also, I listened to Kamelot with the HE 4xx and it rocks it.

Sorry, I should have been more clear. 200$ for new headphones, but If I'm just getting a new amp I'd like to keep it around 70$

Definitely too quiet. The portable amp does seem to help a lot(with volume at least), I'm just not sure if it's enough. I know Amps are supposed to help with volume, but I've also read elsewhere that they're supposed to help with other qualities of sound as well.

I can't figure out if I need to try a different headphone or a different Amp. The Behringer P2 Amp Under the stats on the device it says " Max output: 2 x 100mW @ 16 ohms " Does this mean it is not powerful enough to drive my new Hifimans HE-4XX that require 35 ohms (it has 93 db/mW...