my 650's that are on the way
CAMBRIDGE AUDIO DAC, DacMagic100 is the dac i want to get.
I Currently have a xonar essence stx,
For now just plug the Sennheiser HD650s straight into the Essence STX.
Down the line when you have $300 to spare, replace the Essence STX with a Audio-GD NFB-15.32 external DAC/Amp.
The Essence STX comes with a PCM1792A DAC chip and a headphone amplifier that can drive 600-Ohm headphones.
so it should do a decent job driving the 300-Ohm HD650 headphones.
The Audio-GD 15.32 is just a really nice DAC/amp for the price.
I've been using one for a month.
You send them an email (listed on their contact page) saying what model you want and the address the DAC/amp would be send to.
Get the TXCO upgrade ($20).
They send you back an email with the total price, using Audio-GD email address you pay the amount thru Paypal and with in 2 days they ship out the DAC/Amp.
Mine took 6 days from time payment made to when it arrived at my place in California.