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Thread: need amp turn on delay, speakers pop

  1. #1
    Maximum Bitrate customaudioman's Avatar
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    need amp turn on delay, speakers pop

    okay, I upgraded my opus 150psu for the newer 180w psu which has the amp turn-on blue/white wire that hooks to the amps remote input. the problem is that the opus180 psu remote wire is not a 12v wire, so the amp does not see any current when booting up which cause the amp to stay off. the fun thing is that only one of the amps will turn on(momo sub amp), but no the 4 ch amp that goes to the rear and front speakers. These amp are arc audio foose series FD-4150(4ch amp 400watt) and FD-1200( mono 1,100 watt). I called arc audio to see what current or voltage the amp need to see to come on they told me very little( 200milamps). But I told them that the mono amp would come on without any problem, the 4ch would stay off. He then said the the mono amp is very sensitive to any change. But the 4ch less sensitive. so then I called opus about the issue of the amp not turning on. they told me that the remote wire from the psu is not powered, like a double ground just used for signal to turn on devices. it was very hard to understand the guy in tech support. So Ive tired the relay to power the amp to see 12v, didnt work, tried the double ground way with the relay the guy told me, amp still wouldnt come on. So I just wired to the acc which works, but with a big pop which will damage my speakers. So I need a amp delay device that you can adjust the time to turn on the amp. Ive seen products out there, but they are only for a few seconds, need something much longer.

  2. #2
    Variable Bitrate csfile's Avatar
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    first thing that came to my mind was fusion brain...but there may be other (possibly simpler) solutions out there

  3. #3
    Maximum Bitrate customaudioman's Avatar
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    I have a fusion brain that I use to use with my accord steering wheel control. I dont need to do all that programming stuff to turn on an amp. something simple.

  4. #4
    What can I say? I like serial. Curiosity's Avatar
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    I make timers for that kind of thing, but I'm thinking all you need is a small 5V relay if it's output is 5V. Connect the coil to the output and ground, then the contacts to 12V and the amp remote wire. You should really get a cheap DMM so you can be positive though.

  5. #5
    Constant Bitrate
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    I'm thinking a relay should work, too. Connect the replay to your acc or any other 12V and trigger it with the output of the Opus.

  6. #6
    What can I say? I like serial. Curiosity's Avatar
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    It may not be a good idea to attempt to sink a relay with a 5V source because it may feed 12V back to the 5V rail. It's triggering one of the amps so that means it has a positive output. It could even be 12V 20mA and the 2 amps are drawing 50mA each. Amp remotes are supposed to have a 50mA max, but mine for example use 12mA and 8mA so they're usually much lower. That's why it would be better to just know, or they could have explained it in the manual.

  7. #7
    Maximum Bitrate customaudioman's Avatar
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    Quote Originally Posted by Curiosity View Post
    It may not be a good idea to attempt to sink a relay with a 5V source because it may feed 12V back to the 5V rail. It's triggering one of the amps so that means it has a positive output. It could even be 12V 20mA and the 2 amps are drawing 50mA each. Amp remotes are supposed to have a 50mA max, but mine for example use 12mA and 8mA so they're usually much lower. That's why it would be better to just know, or they could have explained it in the manual.
    even when I hook up just one that does not turn on by it self, still will not turn on. the guy from opus said the remote wire has no current. But im not understanding why it turns on my sub amp but not my 4ch amp.

  8. #8
    What can I say? I like serial. Curiosity's Avatar
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    Yeah, that is really strange that it triggers the amp. The 180W one shows a diagram of RMT to a switch connected to +BATT internally. That would be what you'd expect. Well if you can't find anything else, my TMR-4 is guaranteed to do what you want. shameless plug.

  9. #9
    Variable Bitrate
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    Well, I tried to find some info on the opus 180w to help you out with that remote wire, but they don't seem to have much info on their site for it. Regardless, you can, instead of the delay, use a windows service to turn the amp on from a serial port. That way it will turn on when windows is booted up, and off before it shuts down.

    Check here for some howtos: http://www.mp3car.com/vbulletin/soft...r-powerup.html
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  10. #10
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    Possible quick and dirty solution:

    Have you tried to run the remote from one of the yellow +12vdc wires on the 4 pin molex connector (intended for an optical or disk drive) on the opus? The amps wont sense a remote signal until after the opus turns on and might fix your pop as well.

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