#270253 - 21/11/2005 13:29
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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Blue? Is that the amp remote line??? If so, that will certainly need to be connected.
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270255 - 21/11/2005 13:51
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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Assuming your empeg is going into an input line on the other head unit, it should connect to that head unit. If you are going from the other radio to the aux in on the empeg, it should connect to the empeg.
Basically, if it is what I think it is, the blue line you see is the amp remote line - the wire that (when 12v is applied to it) signals the amp to turn on and do its thing. It might be that everything else is correct, but the amp (not seeing the remote signal) is turned off. Do you have a status LED or any blinkenlights on the amp to show that it is turned on? (Note: This is completely different from the amp's power feed, but you probably already know that.)
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270260 - 21/11/2005 14:25
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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What kind of cheap CD head unit? Does it have an "amp remote" line or equivalent?
I found a PDF of the genesis profile four. The last connection at the very end is labeled as the remote line. Your blue wire should probably be connected to this line on the amp, and to the "remote" wire output on your head unit (if one exists).
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270262 - 21/11/2005 14:44
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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Hmmm... The head unit's site seems to say it uses an ISO out adapter. It might be that it uses the same position in the ISO adapter that the empeg uses (pin 5 in the wiring diagram). Still looking...
Edit: Aha! Over on their support FAQ page, they answer about connecting the amp remote out line with:
Quote:
Where can I connect the remote wire of my amplifier?
If you are using an after market radio you would connect the remote of the amplifier to the remote wire of the radio labeled; (remote, amp turnon or pwr. ant) on most radios a blue wire or on others a blue with a white tracer. If you are interfacing the amplifier with a factory (OEM) radio you will connect the remote terminal to an accessory wire that powers up only when the key is in the on position.
Edited by pgrzelak (21/11/2005 14:49)
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270264 - 21/11/2005 16:55
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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Greetings!
I think that will work, assuming their ISO connector is standard (not a certainty), but there should be some labeling on the head unit.
As for the PDF and information, I found myself in the support section after a few googles, and was able to get to their FAQ page. That is what I linked. I hope it will help.
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270265 - 21/11/2005 17:44
Re: Help - power but no sound
[Re: furtive]
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tfabris
carpal tunnel
Registered: 20/12/1999
Posts: 27576
Loc: Seattle, WA
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Quote:
Right, question 2 - I have a 4 channel amp so have 2 pairs of RCA connectors but the headunit only has a single pair. Can I just get one of these and join the front and rear's together?
Depends on the direction you're going. I think, assuming that what you're talking about is a 4-channel amp and a 2-channel head unit, yes that's possible.
But you're not joining in that case, you're splitting. So your word "join" is confusing there. What you'd be doing in that case is splitting the outputs of the head unit to go into the 4 inputs of the amp.
However. does your amp have pass-through connectors on it? If so, use those instead, do not use the Y-splitter adapter you pictured. Only use the Y-adapter as a last resort if your amp doesn't have pass-through connectors. Illustrations of various ways to hook things up are here.
If you're going the other direction, trying to take four output channels and combine them into two input channels, that really is joining, and you should not do it.
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#270268 - 21/11/2005 18:31
Re: Help - power but no sound
[Re: matthew_k]
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tfabris
carpal tunnel
Registered: 20/12/1999
Posts: 27576
Loc: Seattle, WA
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Yeah, just don't hook it up that way permanently, or you'll get speaker-damaging pops when you turn the car on and off.
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#270269 - 21/11/2005 18:31
Re: Help - power but no sound
[Re: JBjorgen]
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tfabris
carpal tunnel
Registered: 20/12/1999
Posts: 27576
Loc: Seattle, WA
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And yeah, what Meatballman said.
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#270271 - 23/11/2005 14:10
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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Okay. Progress!
Now, you are not getting anything out of the rear speakers? Except when you plug the rear RCAs into the front head unit outputs? Do you have the fader controls set correctly? Another thought, make sure (if you are not using a sub) to have the lowpass filter off on the amp. Are you using Y cables? Can you clarify your existing wiring and options on the head unit? Thanks.
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270273 - 23/11/2005 14:41
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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That should do it! It looks like you should have a nice setup when you are done. Cool!
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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#270274 - 23/11/2005 14:49
Re: Help - power but no sound
[Re: furtive]
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mtempsch
pooh-bah
Registered: 02/06/2000
Posts: 1936
Loc: Gothenburg, Sweden
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Quote:
Right, looking again at the wiring diagram for my amp it shows that the front preouts are on the far left - but these are the ones I have removed as they were driving the rear speakers!
So it looks like when my amp was installed the wiring was done incorrectly. So if I move the connections from the right hand connectors to the left ones, I should be good to go I think.
What's front and channels on an amp is typically not set in stone, but which signal (front/rear left/right) you plug in where on the amp. Though often you're constrained by what filter options are available for what channels on the amp and how you typically set up a system (front system HP filtered to reduce the stress from deep bass, rear channels LP filtered to run a sub ). The labelling on the amp should [hopefully] be consistent between input and related output, but you're of course free to ignore any 'front', 'rear', 'left', 'right' labels if it better suits your setup - cable runs, filtering etc...
Quote:
If you can excuse my poor MS Paint skills, the attachment shows roughly how it's all wired up.
Hmm, as I interpret that, you're running everything off the HU and the amp actually doesn't power anything at all... And you've got two speakers in parallell on each channel in the rear, possibly creating a too low impedance for the HU, but yhat's not the impression I got from the posts earlier in the thread...
/Michael
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#270281 - 04/12/2005 12:06
Re: Help - power but no sound
[Re: furtive]
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pgrzelak
carpal tunnel
Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
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Have you checked the player on AC power, just to be certain it is not the empeg itself?
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs
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