So I currently have the Beyerdynamic COP's and I was very interested in purchasing a portable amplifier to go along with them. Ideally, I would like to spend $200 or less on this amp, and it would need to be USB since I would be running it out of my MacBook Pro. Any ideas?

So I am considering getting the Sennheiser HD800, and I was wondering which amps/DAC's go best with it for under $1500 total. I've heard that the Burson Audio HA-160D is a very good combo, but I'm also wondering about amps like the Woo-Audio WA2 and Apex Arete. What are your thoughts on the...

I listen to little to no live music, so I'm not really concerned about soundstage. I would be using them for mainly at home use but also would like them accessible for plane rides or car rides where I'm not driving. I listen to almost all Alternative music, but occasionally I like Rap and...

Or the Signature Pro's from Ultrasone.

I am currently debating between the Ultrasone Edition 8 or the Beyerdynamic T5p...which one overall has better sound quality coming off of an iPod or MacBook Pro?

Do you mean the Edition 8 or the S-900's? From Ultrasone?

I am looking for a pair of excellent portable over the ear headphones for use. I would like my iPod to be able to drive them sufficiently, and would also like minimum sound leakage. Thus far I have thought about the Beyerdynamic T5P or the Audio Technica W5000. And when I say portable, I mean...

What is your opinion on the BiFrost+Lyr vs the ALO PanAm?

As far as cables go, do you think that the default LCD-2 cable is fine or would you invest in Norse or Moon Audio?

What are your thoughts on the Valhalla vs the Lyr? Is the Lyr worth the extra $100?

Quote: Also what tubes and voltage do you recommend?

Quote: What DAC would you recommend with this?

       

I have a MacBook Pro as a source currently. Are there any programs you would recommend using on the Mac for better sound quality, or is iTunes fine?

Would you recommend the Schiit ASGARD or the O2+ODAC Combo?