This is a pair of SongTower QWT's that is self powered. No need for a DAC, preamp or amp.
Just plug in your source and you are good to go. Your source can be a CD player (or other device) with coax S/PDIF, a USB connection to a computer or any analog source. In fact, you can use all three of these inputs and the system will automatically switch to the device that is currently sending a signal. A remote is also included that allows volume control and manual input switching. (Add a StreamPlayer and you have a complete music system!)
If you are interested in more information, we put a web page together outlining the system. Here is a link...http://salksound.com/selfpowered.htm
And of course, you can email for any additional information you may require.
Normally, this build would be $3045 including $300 for the cherry hardwood stringers. But we're throwing in the stringers for free. So the price is $2745 plus shipping.