[TKonrad.NOLA]

I do most of my listening via laptop.  Is there a headphone amp that I can connect via USB or is there another way to connect a headphone amp to my Macbook Pro?
I was considering purchasing the AKG-K701 as that is what lead me to get a headphone system

[eclein]

DigitalDude there are a bunch of amps-USB DAC's-etc..you might want to check out:

http://www.head-fi.org/

The DAC I chose, Grant Fidelity Tube DAC-09 does USB, Headphone etc..as does Maverick D1 and others, here are a couple links:
http://www.grantfidelity.com/site/Grant_Fidelity_Tube_DAC-09

http://www.mavaudio.com/base/

the above two are basically identical, FWIW-Cheers..Ed L.

[saisunil]

I have recabled 701 as one of my reference amps. From a purist perspective:
 
Have a
1. Separate source
2. Separate headphone amp
3. Recabled 701
 
Depending on your budget - you could get a USB Dac plugged into a separate headphone amp or a usb dac/head-amp combo - headphone.com has very good selections.
 
701 need to be
1. recabled
2. have powerful / high current amp to really shine ... hybrid amps can add some tube warmth / coloration / tube-rolling fun/flexibility.
3. Burn-in for at least 300 hours ...
 
Of course you can pick and choose what you want to do / afford - I am just sharing my experience ...
 
Have fun!

[tjohnusa]

If you want to keep cost down look for a Totalbithead it's a usb dac/amp