Thanks Robert and his post very much, so I know more about audiocircle.

Now we already released the new version of several DIY-Kits with RCA-->XLR Converting module in Audiogon:
http://app.audiogon.com/listings/466580The cheaper kit is A000 Basic-Kit(incl. one 125ASX2 module), $299, run in following modes:
The most interesting and powerful is A200 Basic-Kit or Pro-Kit(incl. two 125ASX2 modules), very compact size, run in following modes with different combinations:
- 2.1 HiFi system: 120w x 2/ch (L/R channels) + 450w x 1/ch (Subwoofer)
- SE mode: 120w x 4/ch
- BTL mode: 450w x 2/ch, via XLR inputs
- BTL mode: 450w x 2/ch, via RCA inputs (Pro-Kit)
- BTL mode: 450w x 2/ch, via 1/ch XLR input + 1/ch RCA input (Pro-Kit)
- Individual balanced signal provider (1/ch or 2/ch), to other amps (Pro-Kit)
Please check
http://app.audiogon.com/listings/466580 to know more details about Ghent's DIY-Kits.
Also, please mail me directly: windowsxp@vip.163.com if anyone have questions.
Best Regards,
Ghent