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In Reply to: RE: Bi-amp fail and Amy Winehouse posted by kSpace on January 31, 2017 at 09:32:34
All the new connections you created. Did you use the same interconnects as when you were only using 5 of the 7 channels? What new cables did you introduce besides the Y's?
Also you ran seven channels of the amp for the first time. I have never seen a multichannel amp or receiver able to run all of its channels to full output. The FTC does not require them to spec wise either. So the power supply in the amp had to work a lot harder to drive seven channels than five and was not likely up to it.
When I was in the biz we measured good expensive gear that would easily give the rated output on each channel with two, three and sometimes four, but never five channels driven at once. Never.
Also some of the Revels are 6 ohm. When you remove the shorting bar to bi-am[p measure the DCR of each set of terminals with an ohm meter. If the LF section is only four ohms that also would provide a tougher load to drive and may be an issue in your attempted implementation.
So while Im glad the switch back is an improvement you owe it to yourself to do that extra research and find out some things.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Follow Ups:
I used DiMarzio 1m interconnects. Have a set of 7. Used matching pairs interconnects for the left and right. The Audioquest Y splitters were very close (?touching) at the back of the processor.
Fascinating about the 7 channel issue. Of course, I was running analog direct stereo, so the other three channels were not being used.
I am curious about Revel in bi-amp mode with regards to your discussion. I doubt the Halcro would have much trouble, even with a 4 ohm load. I will try to measure the the resistance as you suggested. If something interesting emerges, will follow up.
Thank you so much for your thoughtful and helpful response!
I didn't realize you were not using all seven channels. The interconnects are the same. Did you use the all metal Y like this one? I used them without issue, so that means I'm at a loss then. I thought it was an Anthem amp I doubt a Halcro would have a problem either.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Similar Y adaptor, only both female connectors are on the side instead of end and side, like the image you included in your response. I would have rather had the end/side connectors, as the side/side form that I have were pretty awkward on the back of my D2.
Yeah, when listening to vinyl, have the D2 in AnalogDir mode (stereo, analog pass thru), so only two channels (or 4 if bi-amp) being used. Fascinating to think that audio or movies in 7.1 might lead to loss of sound quality.
Not sure exactly how the speaker network is configured, but since there are shorting plates, I'm pretty sure the high and low freq inputs have their own high and low pass filters and then internal crossovers to distribute the sound to the individual drivers. So, I think the problem is likely slight differences in resistance between the interconnects, crosstalk due to the close proximity of the y connectors on the back of the D2 or slight phase differences between the amp channels used to bi-amp each main channel.
From a hobbyist point of view, I'd love to figure this out. But... The sound is so good with single amp channel to each main speaker that I'm happy to throw in the towel, pour a tall frosty one and enjoy the music!
Cheers!
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