I think you may be going about this the wrong way. As far as power ratings go, there is no standard. For example 10 different amps from 10 different companies all rated at 100 watts per channel will all put out a different amounts of power. As far as being class A, I don't think thatÂ’s it, either. You should have no problem getting the same kind of power from an AB amp.
There are so many factors that may be responsible for the results you are getting we can only guess at what the problem is. I'll list a few things that might be worth looking at.
-Other components; especially the preamp. Don't underestimate the importance of the preamp. I've literally had situations where upgrading the preamp was the equivalent of adding a subwoofer.
-Koestner says it may be the room. I agree. (Its more likely a combination of different factors, just to be more clear)
-Unless I'm mistaken, your speaker is a bookshelf/stand mounted design.
-It looks like you are biamping with 2 completely different amplifiers. I don't even know where to begin on this one except, stop. Just use 1 amp. If you can't get results with a DNA500, I'm not sure what to tell you; except..
-You just may like the sound of the old Krell amps. Many do. If that's the case, it may make sense for you to buy one. Just one. (If you must have 2 amps and biamp them, I highly recommend you buy 2 stereo amps, exactly the same, and do a vertical biamp. I don't feel its necessary, but at least you wont be doing anything that will mess up your sound quality.)
There are so many factors that may be responsible for the results you are getting we can only guess at what the problem is. I'll list a few things that might be worth looking at.
-Other components; especially the preamp. Don't underestimate the importance of the preamp. I've literally had situations where upgrading the preamp was the equivalent of adding a subwoofer.
-Koestner says it may be the room. I agree. (Its more likely a combination of different factors, just to be more clear)
-Unless I'm mistaken, your speaker is a bookshelf/stand mounted design.
-It looks like you are biamping with 2 completely different amplifiers. I don't even know where to begin on this one except, stop. Just use 1 amp. If you can't get results with a DNA500, I'm not sure what to tell you; except..
-You just may like the sound of the old Krell amps. Many do. If that's the case, it may make sense for you to buy one. Just one. (If you must have 2 amps and biamp them, I highly recommend you buy 2 stereo amps, exactly the same, and do a vertical biamp. I don't feel its necessary, but at least you wont be doing anything that will mess up your sound quality.)