Alpine V12 MRV-400 picking up radio on ch2

andymacsub · 8th November 2011, 12:07 PM

Hi there
I'm a newbie on here. Having an issue with this 4ch amp. 3 channels are fine, but ch 2 is not. As soon as I plug an RCA into it it plays no music but is picking up radio signals, like a detuned radio. I have tried swapping the signal cables, switching different input modes etc but to no avail. If I leave it unplugged and just run ch1 in mono mode with the output bridged it works fine, although not entirely sure if I'm getting full power in this config. ch3 & 4 are fine. If I pull the RCA out slightly leaving the centre core attached the interference disappears, and it plays properly. I have read the other posts on here which were very helpful and will have another look tonight to see if it's the RCA input itself. Luckily I have another Alpine that I can use for parts if needed. Any help would be most appreciated.

AKHeathen · 8th November 2011, 10:10 PM

Have you tried swapping rcas at the source?

andymacsub · 9th November 2011, 02:24 PM

Yes, tried different interconnects and a different source altogether, still the same issue. Hopefully have time to desolder/resolder the RCA sockets tonight and see whats what.

8th November 2011, 12:07 PM	#1
andymacsub diyAudio Member Join Date: Nov 2011	Alpine V12 MRV-400 picking up radio on ch2 Hi there I'm a newbie on here. Having an issue with this 4ch amp. 3 channels are fine, but ch 2 is not. As soon as I plug an RCA into it it plays no music but is picking up radio signals, like a detuned radio. I have tried swapping the signal cables, switching different input modes etc but to no avail. If I leave it unplugged and just run ch1 in mono mode with the output bridged it works fine, although not entirely sure if I'm getting full power in this config. ch3 & 4 are fine. If I pull the RCA out slightly leaving the centre core attached the interference disappears, and it plays properly. I have read the other posts on here which were very helpful and will have another look tonight to see if it's the RCA input itself. Luckily I have another Alpine that I can use for parts if needed. Any help would be most appreciated.

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8th November 2011, 10:10 PM	#2
AKHeathen diyAudio Member Join Date: Apr 2011 Location: Anchorage AK	Have you tried swapping rcas at the source?

9th November 2011, 02:24 PM	#3
andymacsub diyAudio Member Join Date: Nov 2011	Yes, tried different interconnects and a different source altogether, still the same issue. Hopefully have time to desolder/resolder the RCA sockets tonight and see whats what.

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