Bi-amping Rules

Hi: Back in the Nineties; I used a Bi-Amp set up. I was using some Adcom stuff the GFP565 as it has three sets of out puts. I used a GFA 535 with about 60watts/Channel. So, When I bought some Polk Audio SDA SRS 2.2 speakers, I needed a bigger amp! I stumbled into a Great deal on a Bryston  4B they were rated at 200watts/ channel then. Even then I was aware of Polk tweeters blowing fairly easy with too much power. My previous speakers were DCM Time Windows (first series). What I did was put the 4B into the "Bass" end of the Polks;(6x 6 1/2 mid woofers into a 15" sub bass radiator each speaker), then used the GFA 535 to run the tweeters and the Time Windows. I never blew any tweeters! That set up had 10; yes ten tweeters. The bonus was the best Holographic stereo soundstage I have ever had or heard. I had the DCMs on the side walls 6-8 feet from the Polks and Image at about 270 degrees in front of me. My case was I got new gear and did not want to part with the old gear yet? Once you know a sonic signature in your set up you can use that to get "other" results. When I played Jimi Hendrix's "Purple Haze" he sounded outside the window singing in and between the two right speakers. I told people this and when I played it they were amazed? I guess what I am getting at is A lot of previous people are right on " Bi Amping Blues". I wanted to experiment. Out of fear of blowing tweeters and  having Extra Gear, so I Bi Amped for fun, and got an extra Bonus in soundstage. That set up was the most fun to listen to of any set up I have had. It unlocked recordings secret information; and that was fun. I think you take all the information and experiment? Something does not work, try something else? Gear is easy to sell and buy now. You can always follow someone else's pattern or electronic IQ, mix and match until YOU are happy.   B

What I don't get about the entire concept of using SS for low freq and tubes for high freq is there will always be a dramatic power differential.  So how can you begin to balance out the sound levels coming from your tweeter and woofer when the amps delivering the signal are themselves delivering noticeable different volumes?  To me that means that the tube/SS suggestion has always seemed sort of useless unless you automatically include an electronic crossover and the ability the sound balance.  Am I missing something here?

aewhistory

What I don't get about the entire concept of using SS for low freq and tubes for high freq is there will always be a dramatic power differential.  So how can you begin to balance out the sound levels coming from your tweeter and woofer when the amps delivering the signal are themselves delivering noticeable different volumes?

The issue isn't one of a power differential between the two amplifiers or whether one is solid state and one is tube. The issue arises when the amplifiers have different amounts of gain, independent of power.  That's why you use an active crossover to balance them out.

At the minimum, you need to be able to control the gain of one of the amps in order to make the bi-amp approach work properly. Even then, the results can be very mixed. My NAD preamp allows for changing the gain on the second pre-out output. Some amps like my Mac MC2200 also have separate gain controls for left and right channels. But gain aside, I still don't quite understand the need for an outboard crossover to control the frequency between the HF and LF sections since both amps are feeding full range and each section of the speaker still operates within its own design frequency range.

russbutton66 posts07-29-2016 8:45pmWhen you bi-amp, you become a speaker designer, like it or not.

Can you share a number of your 'supply' dealer so I can try it too?