Hello. I have two Proton D540. I want to bridge each of them, and use each one to drive each of my two speakers (I think many people call this horizontal bi-amping). One amp (right) will serve as the amp driving the right speaker and also serve as preamp for the system, the other (left) will simply drive the left speaker. I have the user manual, in which they explain how to bridge one amp, and briefly allude (no details) to the use of another bridged D540 to drive another speaker, but based on this I tried connecting the system, and something is wrong: I get a strong buzzing sound (no music heard) in the left speaker, and a rather poor music sound in the right speaker. I search the forum here and I found one thread on bridging a D540, but it is not useful for my case.
In theory, it should not be difficult. For the right amp (also used as preamp), I put the bridge switch to ON, remove the jumper going from left preamp out to left main in (the bridged amp use the right preamp out and main in when bridged) and connect the speaker. The recommended speaker connection found in the user's manual is strange to me: they say to "connect the positive lead to the right channel red(+) post, and the negative lead to the left red(+) post, and not connecting anything to the black (-) posts." This is what I have done. Is this OK?
For the left amp, I have done the following: put the bridge switch to ON, and remove the jumpers for BOTH left and right preamp-out main in. To drive this amp, I have connected a RCA cable from the left preamp out of the right amp (the one serving as preamp) to the left amp right main in. And finally, I have connected the left speaker just as I did for the right amp that is, connect the positive lead to the right channel red(+) post, and the negative lead to the left red(+) post of the left amp.
What did I do wrong? Of course, I want to specify that both amps are working fine when used as regular (unbridged) amps driving each a set of speakers. Your help would be more than welcome!
Labdrive
In theory, it should not be difficult. For the right amp (also used as preamp), I put the bridge switch to ON, remove the jumper going from left preamp out to left main in (the bridged amp use the right preamp out and main in when bridged) and connect the speaker. The recommended speaker connection found in the user's manual is strange to me: they say to "connect the positive lead to the right channel red(+) post, and the negative lead to the left red(+) post, and not connecting anything to the black (-) posts." This is what I have done. Is this OK?
For the left amp, I have done the following: put the bridge switch to ON, and remove the jumpers for BOTH left and right preamp-out main in. To drive this amp, I have connected a RCA cable from the left preamp out of the right amp (the one serving as preamp) to the left amp right main in. And finally, I have connected the left speaker just as I did for the right amp that is, connect the positive lead to the right channel red(+) post, and the negative lead to the left red(+) post of the left amp.
What did I do wrong? Of course, I want to specify that both amps are working fine when used as regular (unbridged) amps driving each a set of speakers. Your help would be more than welcome!
Labdrive
