Sonic T-amp, no sound on left channel on low volume

willmans · 26th September 2007, 02:00 PM

As the topic says, if I have the volume set to a low level (like listening when others are sleeping) theres no sound from the left channel.
If I turn the volume up to normal levels the left channel comes on. Has anyone else seen this problem?
I don't remember having this problem with my old one. I'm running it from a 12v sla battery and I tried different inputs and speakers but the problem persists. Any ideas?

BWRX · 26th September 2007, 02:14 PM

Sounds like the volume potentiometer is bad.

willmans · 26th September 2007, 04:00 PM

Yeah, I swapped the one from the old broken one and it was somewhat better but still not balanced. Guess I'll have to mod it with a better quality one.

BWRX · 26th September 2007, 04:27 PM

If you just swapped the pot and it's still bad then that points to bad wiring. Those wires going from the board to the pot are real cheap and can break internally.

nukegoat · 7th October 2007, 05:33 PM

I had the exact same problem (with the left channel being bad) but I had planned to replace the pot anyway - the problem went away after doing so. Measurements of the pot with my DMM showed a fairly substantial imbalance between the two channels, so go figure. You're not alone with this oddity though. If you don't plan to replace the pot you could always send it back and get a replacement unit.

26th September 2007, 02:00 PM	#1
willmans diyAudio Member Join Date: Mar 2007	Sonic T-amp, no sound on left channel on low volume As the topic says, if I have the volume set to a low level (like listening when others are sleeping) theres no sound from the left channel. If I turn the volume up to normal levels the left channel comes on. Has anyone else seen this problem? I don't remember having this problem with my old one. I'm running it from a 12v sla battery and I tried different inputs and speakers but the problem persists. Any ideas?

26th September 2007, 02:14 PM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Sounds like the volume potentiometer is bad. __________________ Brian

26th September 2007, 04:27 PM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	If you just swapped the pot and it's still bad then that points to bad wiring. Those wires going from the board to the pot are real cheap and can break internally. __________________ Brian

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26th September 2007, 04:00 PM	#3
willmans diyAudio Member Join Date: Mar 2007	Yeah, I swapped the one from the old broken one and it was somewhat better but still not balanced. Guess I'll have to mod it with a better quality one.

7th October 2007, 05:33 PM	#5
nukegoat diyAudio Member Join Date: Sep 2007	I had the exact same problem (with the left channel being bad) but I had planned to replace the pot anyway - the problem went away after doing so. Measurements of the pot with my DMM showed a fairly substantial imbalance between the two channels, so go figure. You're not alone with this oddity though. If you don't plan to replace the pot you could always send it back and get a replacement unit.

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