The combo "Odac + Neco V3" is very well-praised:http://www.head-fi.org/t/513233/neco-so ... -2-amp/105
"ODAC + NECO V.3 + Sennheiser HD580 = A MATCH MADE IN HEAVEN.
I can't tell you how beautiful this rig sounds. We all know how well the HD580/600 scales with better sources and amps.. but synergy is often undervalued. The ODAC is beautifully resolving and clean.. but the Neco really steals the show, IMO.
My V.3 has the 8610s & lithium battery.. and boy, does the HD580 love it. A DEAD silent background, fantastic dynamic range.. and the artful Sennheiser sound.. on steroids! Treble has spectacular air, crispness, and detail.. the mids are very very transparent and deep.. with the bass coming tight and punchy. One thing I've really noticed the Senn benefits from is the V.3's dual opamp setup.. which provide fantastic channel separation, imaging, and soundstage. It's so immersive.. I can listen to this setup for hours on end. I like this little combo more than my desktop rig (via the tube or SS output!) and the ODAC+O2 (which is a little too clinical). For those one the fence about this amp.. stop waffling.. it's a GEM.
I also dropped the gain jumpers in so I've got it set at low gain (2.3x) since it's being used with the ODAC (2 Vrms output). the Neco it quite ably drives the HE-500, btw. Very clean & dynamic, again.
When driving the HE-500.. I like this combo more than the O2."
The Odac USB DAC can interwork with an Android powered smartphone Samsung Galaxy S III as well as with a PC or a Mac.
Odac USB DAC:http://epiphany-acoustics.co.uk/our-pro ... e-usb-dac/ http://www.jdslabs.com/item.php?fetchitem=46http://www.headnhifi.com/index.php/shop/objective/odac
Neco V3 amp :http://www.ebay.co.uk/itm/new-V3-DUAL-A ... d=ViewItem