As you my have recently read, my fully restored Sansui AU-D11 Mk2 is kicking some serious butt. But it left my Yamaha A-S2100 all cold and lonely. So I decided to experiment with Bi-amping and I am happy to present to you the YamSui A-D2111Mk2! I have all the sources fed into the Sansui and use Tape out into Line input of the Yamaha. Currently the Yamaha is powering the LFs (160W at 4ohms) and Sansui into the HFs (Guessing it might be 180W+ into 4ohms). I have to individually control volume on both, it seems pretty easy. I set a level on the Sansui, get into my listening positions and use the remote on the Yamaha to dial up the LF to match . Once I get my second set of proper speaker cables delivered I will experiment more by swapping the LF and HF amps. Currently I am limited by the binding posts on the Sansui. How does it sound? First impressions are great. I can see why people are drawn to Bi-amping. There is so much more head room when you play loud. The bass is tighter and more focussed and instrument separation is definitely better. Sound stage and clarity seem better too. The Polk LSi15 are really power hungry and the extra amplification seem to really open it up and give it more legs!