Recommendation for SS amp for biamping

Hafler built a number of pro TransNova amps, many that provide gain controls for both channels(necessary for matching with your mains). Any of them would provide you with the bottom-end attributes you mentioned. One drawback: Most are equipped Pro-style inputs(XLR and 1/4"). You could use adapters(to audition), then install some good RCA jacks. The two best(9303 and 9505), both have RCA inputs, but- no gain controls, which are VERY critical for your application. (http://images.search.yahoo.com/search/images;_ylt=A0SO8zF3kM5STTUA_L1XNyoA;_ylu=X3oDMTB0cWVmanVlBHNlYwNzYwRjb2xvA2dxMQR2dGlkA1ZJUDM0M18x?_adv_prop=image&fr=uh3_my_web_gs&va=hafler+transnova)

Class D amplifiers (CDA) - SDS 470 - $700 with gain controls - high enough power to drive your low end,\. I bi-amp Von Schweikert VR-35s with Bel canto 1000 Ref on top and Class d amps on bottom with tube preamp and they work fine.

Not many options as I see. Just two ideas. Thank you so much. I thaught to use 2 Bel Canto ref 1000 M monoblocks for the bass. Is it good idea. They have 1000 W of power but are they punchy and agressive enough?

I use two Arcam P38 power amps to bi-amp. Great results!

I would try DC coupled monoblocks running in class A. But to really get the benefit of biamping you need to use an external crossover between the preamp and the 2 sets of monblocks.

A point that is commonly overlooked with respect to passive biamping (i.e., biamping without an electronic crossover between the preamp and the power amps) is that both the high frequency amplifier and the low frequency amplifier have to output essentially identical voltages (assuming that differences in their gains are compensated for somehow, which of course is necessary for proper tonal balance), those voltages corresponding to the full frequency range of the signal.

Therefore if the two amps have very different power capabilities, and therefore most likely very different output voltage capabilities, most of the power capability of the high powered amp will not be usable. If the volume control is turned up high enough to use a lot of its power capability the lower powered amp will be driven into clipping, resulting in extremely distorted sound.

In this case you are considering using an 8 watt tube amp in conjunction with an amp that can provide 1000 watts into the speaker's 4 ohm nominal impedance. I doubt that you would ever be able to use more than a tiny fraction of those 1000 watts without clipping the 8 watt amp.

Using an electronic crossover ahead of the amps would resolve that issue in itself, but I would feel pretty certain that you still would not be able to utilize the vast majority of the 1000 watts unless you set the electronic crossover's crossover frequency way too high to be compatible with both the low frequency drivers and the speaker's internal crossover. Also, a good case could be made that having two crossovers, one electronic and one within the speaker, is less than optimal even if their crossover frequencies are set compatibly.

Finally, I see that the Audio Note amp has only one pair of output terminals, rather than providing multiple taps, which leads me to wonder how well it can handle the low impedance of your speakers.

IMO, instead of biamping it would be better to consider just upgrading your amp. Oftentimes simpler is better.

Regards,
-- Al

Thank you Al. I am considering an upgrade of the amps too. Now I am looking at two Burmester monoblocks. Think they may be better than the entry level Audio Note.