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Subwoofer auto bypass?

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98falstaff

New Member
I have this powered subwoofer, a Cerwin Vega CLSC 12S. It is either off, or in the auto off/on mode. The thresh hold of the bass signal seems to be too high in the amp to keep the amp on. So I assume this signal detector detects the bass signal level and closes a switch to power on the amp. 120 volts I would presume. If I could find this switch, I'd like to jumper across it to keep the amp on all the time. I just bought a new sub that has a constant on feature, so this older Cerwin Vega is just sitting unused and would not kill me to modify it. Can this be done and is this a good idea? Thanks for all input.
 

karyoker

New Member
I have this powered subwoofer, a Cerwin Vega CLSC 12S. It is either off, or in the auto off/on mode. The thresh hold of the bass signal seems to be too high in the amp to keep the amp on. So I assume this signal detector detects the bass signal level and closes a switch to power on the amp. 120 volts I would presume. If I could find this switch, I'd like to jumper across it to keep the amp on all the time. I just bought a new sub that has a constant on feature, so this older Cerwin Vega is just sitting unused and would not kill me to modify it. Can this be done and is this a good idea? Thanks for all input.

This is a protection feature which should not be bypassed. The threshold is close to clipped audio which will destroy a speaker. When a woofer is popping it is being over driven and wont last long. Reduce the bass peaks going to the woofer.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
This is a protection feature which should not be bypassed. The threshold is close to clipped audio which will destroy a speaker. When a woofer is popping it is being over driven and wont last long. Reduce the bass peaks going to the woofer.

I suggest you reread the original post, you're talking about something completely different.
 

karyoker

New Member
You can use an audio proc such as the Aphex 204 with big bottom. It increases lower bass without taxing the speakers.
 

karyoker

New Member
I suggest you reread the original post, you're talking about something completely different.

This is the post from the OP that I read.
I have this powered subwoofer, a Cerwin Vega CLSC 12S. It is either off, or in the auto off/on mode. The thresh hold of the bass signal seems to be too high in the amp to keep the amp on. So I assume this signal detector detects the bass signal level and closes a switch to power on the amp. 120 volts I would presume. If I could find this switch, I'd like to jumper across it to keep the amp on all the time. I just bought a new sub that has a constant on feature, so this older Cerwin Vega is just sitting unused and would not kill me to modify it. Can this be done and is this a good idea? Thanks for all input.

I do not know what you are referring to.
 

karyoker

New Member
A bass amp has a protection circuit in it that shuts off the output amps when it is being overdriven during peaks. I run and install professional audio systems I am an audio engineer. An audio amp idles with no input it does not shut itself down. I understand the original question and I am giving him professional advice.
 

98falstaff

New Member
Thanks Nigel, I hope my original question was clear enough. I'm going to get my meter and tear into this and at least see what things look like in there.
 

karyoker

New Member
ROFL Are you driving it with an active crossover or passive? It is obvious that nobody here understands why a bass amp has an auto shutoff. Give me a description of your system and I can advise you about gain structure or peaking your system.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
ROFL Are you driving it with an active crossover or passive? It is obvious that nobody here understands why a bass amp has an auto shutoff. Give me a description of your system and I can advise you about gain structure or peaking your system.

Everyone else understands him apart from you.

It's NOT an auto-shutoff problem, it's an auto-switch ON problem - read what he posted.

The instruction manual is no use, it's a circuit diagram that's required.
 

98falstaff

New Member
Not you Nigel. Also I'm sorry for being a smart alec. A lot of people have this same problem, don't know if certain AVRs signal is too low or if some powered subs levels are too high. Maybe Yamaha and Cerwin are a bad combo. Anyway my new one works great on "on". There has to be some contacts that close to turn on this sub's amp and I'm going to close them for it. Thanks again.
 

karyoker

New Member
I really would suggest you join this forum and ask the same question.
I will not recommend prosoundweb or they will tear you apart.

link
 
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98falstaff

New Member
I am not an audiohpile fanatic snob, just a working, joe sixpack electrician with a mid grade home theater set up, who thinks my old sub could use an improvement. With this apparently common problem, you would think all subs would have off/on/auto, but some do not. I figured someone here on this electronics forum may have heard a mod and have some ideas. My new sub, which the brand doesn't matter, is doing just great. Thanks
 

karyoker

New Member
Three times now I have offered tech advise on this forum and somebody jumped on my case. I am not going to post a photo of my engineering degree or or post my resume. I am done...
 
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