Looking for a USB Headphone amplifier


I am currently using a Music Fidelity OBH21 amp with a V-DAC to drive AKG 701 headphones. Though this system provides detail, I would like to improve on the ’soundstage’ and add a little more bass.

To this end, I am looking for USB headphone amplifier and also may upgrade from the 701s. Would like to purchase the amp 1st, one that would support a headphone upgrade.

Any recommendations?

mesch
I bought Oppo HA-2 headphone amp recently and it sounds amazing. It has asynch USB, SPIDIF, DSD an analog in/out.  I use USB.  Sounds better than my Benchmark DAC1.  D/A converter IC is SABRE 32-bit. It has lithium battery and can be used with a phone, but I’m using it as stationary unit only (next to my computer).

https://www.oppodigital.com/headphone-amplifier-ha-2/
Thanks kijanki, I took a look at the Oppo.  I have not made any move as of yet.  I am keeping an eye on the used market.  



I purchased a used Schiit Vahalla tube headphone amp here on AG. I will use it with a Music Fidelity V-DAC II and MHDT Paradisea+ DACs. Currently to drive my AKG 701Q headphones.  One day I what to try a Audezen headphone however not sure the Vahalla does well with phones having ~30ohm impedance, as do the Audeze models.