Originally Posted by deltadube
Originally Posted by Theresa
Passive bi-amping has no real world effect other than wasting an amp channel and wire costs.
might also put this quote from denon in here as well
This prevents the back electromotive force (returned force
without output) of the woofer sent to the tweeter, which affects the sound quality of the tweeter, and
you can enjoy playback with higher-quality sound.
why do they write this ..? i know the avs forum is loaded in people with your statement above..
but i tell you it sounds better..
have you tried it?
Yes, I have tried it.
Passive biamping, as Theresa puts it, is a waste of an amp and some wire. It can't make any audible difference unless Denon etc have found a way to bypass the laws of physics. And you remember what Scottie said about that - even in Stardate 5928.5 it stil would not be possible :) The reason is this pesky, irritating little thing known as the Superposition Theorem. You'd have to google that to find out about it as to discuss it here would take us waaaay off topic. Basically it says that where a circuit has more than one independent source (this is the additional wires running from the additional amp) the voltage/current (it makes no difference) is equal to the sum of the voltage/current you would see if each independent circuit acted on its own (ie each amp in the 'biamped' system was just connected on its own). You will find deeper explanations of this by googling if you want to check it out more.
So, when you 'passively biamp' the Superposition Theorem of Physics proves that you can't in fact make any difference, so no difference = no audible difference.
The next question is, why do you feel so strongly that you CAN hear a difference. And the answer to that is your pesky brain doesn’t work the way we'd like it to work. Nobody's does - I'm not singling out your brain for special attention :) Your brain (and everyone's) has not been designed to provide you with an objective view of reality. That is why for thousands of years people believed that the sun revolved around the earth - they could SEE it did, using their eyes and their brain. It was 'obvious'. It was similarly obvious that the earth was flat. Later, some clever dudes came along and proved, by independent scientific examination of the phenomena, that the sun did NOT go around the earth at all. For their pains, they were put in prison. People could see that the sun went around the earth and the evidence of their own eyes was far more powerful than some squiggles of math on a bit of paper. Now of course, you won't even get a small fine, let alone be put in prison, for suggesting that the sun does not revolve around the earth.
So..... your brain (everyone's brain - this is getting old real fast - can we assume that when I say 'your brain' I mean all the brains in the world today?) your brain fools you into thinking you can hear a difference when no difference exists. This can be placebo effect or expectation bias or a number of other things. It's probably expectation bias though. You wired up for 'biamping' and you expected it to make a difference (two amps, more wire!! Hey - how can it not make a difference?) so your brain told you "yeah deltadube, listen to those highs now - much clearer huh? And the separation - that's better too huh? And the imaging? Wow!. The fly in the ointment.... Superposition Theorem. Damn!
If you had the facilities to conduct a blind test between your 'biamped' system and your 'regular system' I would be more than happy to bet you my house that you wouldn't reliably be able to tell one system setup from the other. Heck, I know you couldn't, because there is no difference. The laws of Physics are on my side, whereas all you have on yours is that tricky human brain. Just like the dudes who threw Copernicus into prison.
For more reading on 'passive biamping', check this out:
Of course, proper biamping, with active electronic crossovers, like Theresa has, and like you find in 'active' or powered loudspeakers - that is a different thing altogether and has huge benefits.
Sorry if this is causing rain on your parade - it is not my intention. The good news is, passive biamping does no harm so you can leave it all set up if that is the way you like it. I mean, look hw many times Jim ignored Scottie..... :)