Another email reply from Vincent.
Hi Tuyen,
I have a Goto SG-16TT, I used it when I had a horn midrange, I haven't yet had the time to try to integrate it to my 125Hz-18KHz ribbon.
Goto driver are transparent and never slow, but a full Goto system is expensive, I could by the low midrange driver.
A 15inch Goto would be nice in may bass horns as well.
My DAc has been comapre to a Zanden (on a french forum) and it is as good for midrange beauty and detail and soudstage, but Totaldac is now better for dynamic and bass, which is a limitation of the Zanden.
Yes the best is to use a USB (or pci) to spdif from a computer. Lynx PCI cards are also very good to output spdif. There are many USB to spdif converter, M2tech for exemple. You don't need to use I2S with my DAC, spdif is good because I d'ont use the spdif clock, I rebuild the clock in the DAC.
Vincent