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Help needed - Only one channel playing!

I am stumped and hope someone can help solve this mystery.

My left AGD Audion mono block stopped playing, while the right one was ok. They are connected directly to a Denafrips Terminator Plus XLR output, but the RCA output also did not fix the problem. I then moved the right amp to the left side after verifying that the cables and connections were okay (even though they had not been touched before the problem). The right amp that had been playing now did not play with the left connection. Alberto (AGD) checked the amps and verified they were testing normally.

Eventually, after many days and playing two different integrated amps, which played both channels, I reconnected the Audions both channels played as expected. Now the problem has returned BUT on the right channel. I moved the right amp to the left channel and verified it plays normally. In other words, the problem has returned, but now the other (right) channel is dead, but only with the Audions, bc I reconnected an integrated, and both channels play as expected.

All connections seem ok, and the problem occurs whether there is an XLR or RCA output connection.

I power reset the TPlus and hard reset the Lumin U2, but that did not help.

I think the problem is in the TPlus, but it's just a guess through the process of elimination.

If anyone has suggestions for correcting this problem, I would appreciate it if you could respond to this message. I'm out of ideas.

Thank you

Michael

quattro4x
zlone
657 posts
 

Confused as well, which component is controlling volume in this setup?

quattro4x OP
4 posts
 

Thanks everyone for responding.

I apologize for any confusion and will attempt to be clearer.

  • I have been using the Leedh volume control in my Lumin U2 streamer to good effect. It is clearer than the preamps I have or have tried. However, there is some loss of body or warmth.
  • The problem I am describing happens with direct dac to power amps or going thru an integrated amps preamp out circuit.
  • Thanks, @carlsbad2. When the problem showed up in the right channel, I had moved the cables from an integrated amp to the monoblocks. I didn't touch the source connections; all other connections remained the same. I went back to the integrated, and everything worked as expected. I think your suggestion to keep changing equipment is the only option I have.
  • @zlone I've checked the cables and connections, including manipulating them to see if there is a faulty connection somewhere, but haven't located it if its there. Will recheck some more.

Again, thanks everyone.

quattro4x OP
4 posts
 

UPDATE:

I just reconnected the monoblocks directly from the Dac, and both channels are singing away as though nothing ever happened. This is truly an amazing mystery.

Is it possible that a DAC can behave this way? I cannot find the problem in the cables, having it occur with XLR and RCA cables.

ron1264
137 posts
 

Check to make sure your power cables are pushed in all the way and firmly seated on the audions. AGD can be fussy with certain power cords 

curiousjim's avatar
curiousjim
4,689 posts
 

Glad to hear that all’s well! But it sounds like something is loose. Let us know if it happens again.

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