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-   -   need some info on Pioneer KPX-9000 HU (http://www.diyaudio.com/forums/car-audio/170442-need-some-info-pioneer-kpx-9000-hu.html)

ul9601 18th July 2010 10:13 PM

need some info on Pioneer KPX-9000 HU
 
Hi all,

I have a Pioneer KPX-9000 headunit but no amp to go with it (I'm led to believe GM-120 is the amp for it). Anyway, I'd like to hook it up to some other amp, so I need some (or any) info on the headunit - users' manual, service manual, schematics whatever.
Also, I'm planning to ditch the tape deck and build in an auxhiliary in jack for mp3 players.
Any help would be appreciated.
Cheers,
Sam

ul9601 22nd July 2010 08:23 AM

After some research and looking at GM-120 amp schematics etc, I think I figured out the pin outs for the massive 9 pin DIN connector.
But there is another connector, looks like a 6 pin DIN socket, which seems to come out of tuner PCB board, and it has a removable plastic cap which shorts a couple of adjacent pins with the cap on.
Any idea what this might be?

By the way, reading a car stereo article on Popular Mechanic April '79 issue, GM-120 doesn't look like it was the standard issue for KPX-9000 - the photo looks different than GM-120 & power output s lower at 20 wpc RMS vs 35 (I think).

Thanks,
Sam

Perry Babin 22nd July 2010 04:29 PM

I think the jumper was to bypass the processor loop (which was to allow the use of an equalizer) but I'm not sure.

ul9601 22nd July 2010 08:00 PM

ok - but what actually hooks up to the 6 pin DIN socket?
or is it just a jumper and nothing is meant to be plugged in?
9 pin DIN seems to have everything that needs to go to the amplifier, i.e. R & L (+ve) and a common audio ground, +12V, GND.
cheers,
sam

Perry Babin 22nd July 2010 09:52 PM

You'd plug in a pioneer equalizer, if I remember correctly. If you don't have an equalizer, you'd leave the jumper in place.

ul9601 22nd July 2010 11:07 PM

Cool - thanks so much, Perry.
Cheers,
Sam

rctm 21st June 2012 03:44 PM

Hi Sam,

I just wanted to clarify a few things, the "white" 6 pin DIN socket you refer to, is supposed to be connected (optionally) to a noise suppressor (AD-306 or AD-307) it is used to reduce static, improve radio reception, etc...

When it comes to amps... your head unit (which I own two) can be hooked up to any of the following amps:

- GM-12, GM-40, GM-4, GM-120...

I would advise you hook up an equalizer... either a CD-5 or CD-7.

I hope this was any help.

Regards,

Rod.

ul9601 28th September 2013 10:50 PM

Quote:

Originally Posted by rctm (Post 3067321)
Hi Sam,

I just wanted to clarify a few things, the "white" 6 pin DIN socket you refer to, is supposed to be connected (optionally) to a noise suppressor (AD-306 or AD-307) it is used to reduce static, improve radio reception, etc...

When it comes to amps... your head unit (which I own two) can be hooked up to any of the following amps:

- GM-12, GM-40, GM-4, GM-120...

I would advise you hook up an equalizer... either a CD-5 or CD-7.

I hope this was any help.

Regards,

Rod.

Thanks Rod, great info there - I couldn't get hold of one of those amps so I went ahead with a pre-amp and an amp, now I'm getting a bad whining interference noise - not sure if it has to do with the amps setup or not but I did follow the usual standard practice of separating signal and power wires.
The only thing I can think of is the pre-amp is getting the interference.
Since then I have obtained GM40 so in theory I can go back to standard setup but me being a dumb n00b I chopped off 9pin din plug off and now I don't know which wires should be spliced back.
Do you have any docs on that regard?
Cheers


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