Mark Levinson 20.0 amps, "Anyone with info on it"

The ML 23, although I have not heard it. I have heard an ML 27 and it had the same character as the 20.0 (actually maybe even slightly darker). I expect that the whole 20 series would have this similar character, but can't be 100% sure. As to the word "dark", there is a thread about the audiophile lingo. The link is: http://forum.audiogon.com/cgi-bin/fr.pl?htech&1024685609
As to what is dark, well I suppose it's the opposite of bright. Bright generally has a lot of high end information and with that frequently comes grain or harshness. It frequently has the "in your face" kind of presentation. Dark does not have that character, it's laid back, free from grain, but does not have the immediacy that something "bright" would. Dark can be a real detriment in some systems, but in others where the speakers might lean towards the bright side, it would likely work very well--at least that's what I found in my system. What speakers are you planning to bi-amp? Have you selected a crossover?

Thanks again for the explaination. I have the Mc XR19 which sounded bright but I've replace the passive cross-over with the B&W's 801 matix x-over and I made a world of a different, much smoother. I listen to techno and trance and I listen to my music very loud (close to max. gain on my ML380s preamp). Therefore, I needed speaker that have multi. woofers, that's why I selected the Mc XR19, which have two 12' woofer per encloser, along with one 8'mids and (12) tweeters. I'm getting the Krell KBX crossover or the Mark Levinson LNC. There seem very few selection of x-over out there. What crossover are you using and what would yo recommend. Thanks
Danny

I'm using a Bryston 10B cross over. I tired the KBX and liked this one better. I have not tried the LNC, but if I'm not mistaken it is single ended only and I wanted to use balanced. I think Marchand makes excellent cross overs as well. At the time I bought my Bryston they did not make a balanced model, but I believe they do now. I am somewhat familiar with the XR19s--is it easy to bipass the internal cross-over in order to do active bi-amping as you are planning? I generally don't care for McIntosh equipment, but they did a remarkable job with that line of speakers. I'm surprised it has not been better received than it has. It can play the techno, classical, pretty much anything thrown at it. When properly set up I've heard those speakers really sound fantastic.

When biamping your speakers, did you have to deal with the issue of adjusting your crossover at the right slope.

Not so much the right slope as the right cross-over point. You should get the slope that is recommended by the speaker manufacturer. For my Martin Logans it was the steepest slope possible (24dB per octave). For the McIntosh I would guess it would be 18 dB per octave, but you should call McIntosh and ask them the optimum cross over point and slope for that speaker. Also, as the "dark" characteristic: "Almost inevitably, a dark sounding unit (all of the early Madrigal/Mark Levinson designs) will be dynamically constricted in the top two octaves." Harry Pearson, the Absolute Sound, Issue 137 August/September 2002, page 101.