Ayre QB-9 USB DAC

"I also need a bigger hard drive although a firewire drive is cheap these days. It is important to use firewire so you don't overburden the USB bus."

I use an "older" Windoze XP based laptop with a 500GB FreeAgent USB drive with the QB-9. Works just fine. USB has plenty of bandwidth for this application. Also I believe with Firewire you'll need a drive that takes external power. Yet something else to plug in....

I'm extremely pleased with the QB-9. Setup instructions on Ayre site worked just fine.

larry

good to know, thanks Larry! I would prefer to have the drive powered by the USB port as well.

Just borrowed a QB-9 from my dealer. I am doing side by side comparison with my current DAC - My current system is:
Ayre AX-7e
Green Mountain Calisto speakers w/tweaked paradigm subwoofer.
Monarchy Tube DAC with NOS Amperex tubes.
Monarchy DIP with 96 khz clock,
Cables are all DIY magnet wire with gold connectors. Speaker wires are magnet wire also.
J-River with Windows 7 running WASAPI (I couldn't get ASIO4all to run on Windows 7)

The QB-9 is connected to balanced inputs, the Monarchy with single ended. I am able to play the CD closely synced with the computer output so I can instantly switch sources on the Ayre AX7 and compare side by side.

I noticed an immediate difference comparing the CD source with the QB-9. Soundstage is clearer, more space between instruments and more depth to the soundstage. Voices are focused and exactly where they should be. I really noticed the clarity of instruments in complex and dense musical passages. There also was more bass with fuller tone. Everything sounded more present and realistic. I compared probably 25 CD's of different music from classical to Hip hop with the same results.
I tried to get some 24/96 sources of CD's I already had but couldn't find any so I wasn't able to do a side by side comparison. I did find some sample 24/96 that sounded pretty darn good.

Honestly, I can see why someone who is used to tubes might find the combination a bit clinical and prefer the Monarchy, but for me, clarity and refinement is exactly what I am seeking.

It's not clear which you preferred, the CD or the computer playback.

I tried to compare my Esoteric DV-50 and the QB-9 both connected via XLR to different inputs on my pre-amp. However, the DV-50 was noticeably louder when switching inputs at the same volume setting. Adjusting the volume puts me past the 200-300ms window where I trust my memory. They both sound great to me, so if there are any differences, it doesn't matter to me.

larry