How to Bypass Relay on Sub Amp?

synthsayer · 30th November 2011, 09:57 PM

My subwoofer amp will not stay on. I have tried to bypass the relay switch but must not be doing it right.

Attached is the sub amp schematic and the Goodsky relay schematic.
Seems like it should be so simple... I have tried shorting across different points by the relay but the amp will still cut off. The power light stays green but that seems the only change.
I turn the amp off and wait a few minutes; turn it back on and get sound again.
Ughhh!!!! Please help???
Thanks in advance

200W Subwoofer Schematic.pdf

Goodsky Relay RWRWH.pdf

madtecchy · 30th November 2011, 10:10 PM

Hi.

The relay is part of the protection circuit. It would be best to find why the protection circuit is activating the relay and put the fault right IMHO. Note A dc voltage across the ls for any length of time could cause a fire

synthsayer · 1st December 2011, 01:31 AM

Thanks for the safety warning.

When I short across one section of the relay the power light goes from green to orange, or from red to orange.

I used the same amp with another 4 ohm woofer and it worked properly.

???

Thanks again.

Enzo · 1st December 2011, 03:55 AM

If the amp works properly with another speaker, then perhaps the original speaker is damaged in some way. The protection circuit senses the excess current demand of the damaged voice coil. Just a possibility.

synthsayer · 3rd December 2011, 03:55 PM

I have tried the amp with 3 other speakers -both 4 and 8 ohm and the amp shuts off. THis happens when the sub amp is connected to Harman AVR 154 sub output.
When I connect the sub amp to a small Tascam TM-D1000 digital mixer the amp stays on. Using -10db outputs on mixer.

30th November 2011, 09:57 PM	#1
synthsayer diyAudio Member Join Date: Dec 2008	How to Bypass Relay on Sub Amp? My subwoofer amp will not stay on. I have tried to bypass the relay switch but must not be doing it right. Attached is the sub amp schematic and the Goodsky relay schematic. Seems like it should be so simple... I have tried shorting across different points by the relay but the amp will still cut off. The power light stays green but that seems the only change. I turn the amp off and wait a few minutes; turn it back on and get sound again. Ughhh!!!! Please help??? Thanks in advance 200W Subwoofer Schematic.pdf Goodsky Relay RWRWH.pdf

1st December 2011, 01:31 AM	#3
synthsayer diyAudio Member Join Date: Dec 2008	Thanks for the safety warning. Thanks for the safety warning. When I short across one section of the relay the power light goes from green to orange, or from red to orange. I used the same amp with another 4 ohm woofer and it worked properly. ??? Thanks again.

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30th November 2011, 10:10 PM	#2
madtecchy diyAudio Member Join Date: Dec 2010 Location: wigan	Hi. The relay is part of the protection circuit. It would be best to find why the protection circuit is activating the relay and put the fault right IMHO. Note A dc voltage across the ls for any length of time could cause a fire

1st December 2011, 03:55 AM	#4
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	If the amp works properly with another speaker, then perhaps the original speaker is damaged in some way. The protection circuit senses the excess current demand of the damaged voice coil. Just a possibility.

3rd December 2011, 03:55 PM	#5
synthsayer diyAudio Member Join Date: Dec 2008	I have tried the amp with 3 other speakers -both 4 and 8 ohm and the amp shuts off. THis happens when the sub amp is connected to Harman AVR 154 sub output. When I connect the sub amp to a small Tascam TM-D1000 digital mixer the amp stays on. Using -10db outputs on mixer.

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