Bridging amps???

unc2701

Ok, check out the attachment... Can you do this with any amp??? (assuming that you can get the reversed phase on one channel)

edit: sonofawhore attachments aren't working. Basically, you use a y cable to feed a single signal to both channels, put one channel 180 degrees out of phase, wire the negative terminals together and wire the speaker to the positive terminals.

thehaens@cox.net

No attachment...................

unc2701

Attachments still bonking here's a link:
http://www.bryston.ca/BrystonSite05/pdfs/LegacyPowerAmplifiers/6Bst+9Bst-BRIDGED-Hkup(RP8)PMC.pdf

thehaens@cox.net

I still couldn't get the pdf to open, must be the lunch hour traffic...

anywho, I don't think this would work with any amp, but I am still a bit fuzzy on the logic of what the phase has to do with it.

I know that Sunfire has an odd way to bridge as well, they combine a Lab output w/ the L/R on the single channel, then cross splice something else, then roll into another output etc. It was far to confusing when I read it in the manual, and I was only using it for stereo anyway so I didn't pay to much attention.

Back to your question.

On my parasound it is pretty easy to bridge. From the Pre/Amp Left Out to the L input on one of the amps. Then run a single speaker wire across both speaker terminals(it is labeled)

From the Pre/Amp Right Out to the L input on the other amp, and run the speaker cable the same.

scott

unc2701

Flipping the phase makes the positive terminal have the proper potential across them.

Lets say +1 volt on the input gives you +30 volts across on the red vs black terminals. So if you flip the phase on one channel, then you get +30 across the one side, -30 across the other side, so the net is +60 across the positive terminals. I'm just surprised because these are basically monoblocks- they share a chassis ground, but that's it, but it seems to imply that you can bridge-mono just about any amp just by flipping the phase on one input (if it's a common ground amp).

heiney9

Can't get the .pdf to load either.

H9

unc2701

Ok, I'll try attaching it from home tonight.

jmierzur

My amp has the ability to run bridged in this manor. Instead of having a polarity switch, it has two RCA inputs out of phase for each channel.

Simaudio Moon W-3 manual

Refer to page 10.

unc2701

Huh... it would certainly seem that one could easily rig a bridge mono switch onto any amp with an XLR input or a phase switch. I need to find an old amp and a crap driver to try this out on...