Logic 7 amp problem

Leegbr · 05-09-2021, 11:52 AM

Anyone know what voltage should be coming out of each channel on the logic 7 amp?

Got an issue with one of the sub channels (right/drivers side) it’s showing 4.5 volts using a multimeter where as the left one shows 18/19. Naturally the right subwoofer isn’t working. I’ve swapped the subs over and it’s still showing the right sub channel as 4.5 volts, so the subs work but not that channel.

Also does anyone know if the fans are meant to be running all the time as ive not seen the fans come to life at all when testing. The amp does warm up a bit but isn’t hot so nit sure if the fan is only meant to come on at certain temps.

ctuna · 05-09-2021, 02:22 PM

https://www.e90post.com/forums/showthread.php?t=1144129

more likely a bad channel see above.

Leegbr · 05-09-2021, 05:53 PM

Yeah looks to be the case, I’ve seen a few threads about the bass going. Probably better off with a replacement amp as I don’t fancy taking it apart. Got it off eBay so hopefully have no problem getting a refund, famous last words.

05-09-2021, 11:52 AM	#1
Leegbr Private 3 Rep 79 Posts Drives: Bmw e92 320d Join Date: Jun 2020 Location: Uk iTrader: (0)	Logic 7 amp problem Anyone know what voltage should be coming out of each channel on the logic 7 amp? Got an issue with one of the sub channels (right/drivers side) it’s showing 4.5 volts using a multimeter where as the left one shows 18/19. Naturally the right subwoofer isn’t working. I’ve swapped the subs over and it’s still showing the right sub channel as 4.5 volts, so the subs work but not that channel. Also does anyone know if the fans are meant to be running all the time as ive not seen the fans come to life at all when testing. The amp does warm up a bit but isn’t hot so nit sure if the fan is only meant to come on at certain temps.
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05-09-2021, 02:22 PM	#2
ctuna Lieutenant General 1911 Rep 13,100 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	https://www.e90post.com/forums/showthread.php?t=1144129 more likely a bad channel see above.
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05-09-2021, 05:53 PM	#3
Leegbr Private 3 Rep 79 Posts Drives: Bmw e92 320d Join Date: Jun 2020 Location: Uk iTrader: (0)	Yeah looks to be the case, I’ve seen a few threads about the bass going. Probably better off with a replacement amp as I don’t fancy taking it apart. Got it off eBay so hopefully have no problem getting a refund, famous last words.
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