I'm a vintage Sansui enthusiast (
www.sansui.us) and in my main system I was vertically biamping two AU-X1 amps I have to my Infinity Renaissance 90 speakers. Preamp is Sansui CA-2000. This preamp has TWO pairs of Outputs, so connecting to two amps is very easy to do- no splitter required. The AU-X1 is an integrated amp with separable pre/power sections, so I simply switch over the AU-X1's to Power amp mode.
I had a problem with one of my AU-X1's the other night so in the meantime I rearranged my setup and now have a horizontal biamp arrangement- using my Sansui AU-20000 (170W) and Sansui AU-919 (110W). I chose horizontal for this because of the two different model amps (as opposed to vertical and identical AU-X1's).
I noticed that I am getting tremendous bass response with the higher wattage Au-20K driving the Infinity speaker woofers and the AU-919 driving the Infinity Emit tweeter/midrange. Out of curiosity, I swapped the amps so that the lower wattage AU-919, now drives the woofers, and the AU-20K the high/mid- and the sound was diferent- less bass, more brightness.
So, my question is: Does this result cause a dispute to the belief (by some people) that most amps sound the same? Does biamping really reveal that two amps can produce different sounding results? Is the 170W AU-20000 and the 110W AU-919 too much difference in wattage such that the bass becomes more prominent than the treble/midrange?
Sincerely, B/F.