need some info on Pioneer KPX-9000 HU - diyAudio
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Old 18th July 2010, 09:13 PM   #1
ul9601 is offline ul9601  New Zealand
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Default 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
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Old 22nd July 2010, 07:23 AM   #2
ul9601 is offline ul9601  New Zealand
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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
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Old 22nd July 2010, 03:29 PM   #3
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I think the jumper was to bypass the processor loop (which was to allow the use of an equalizer) but I'm not sure.
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Old 22nd July 2010, 07:00 PM   #4
ul9601 is offline ul9601  New Zealand
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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
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Old 22nd July 2010, 08:52 PM   #5
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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.
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Old 22nd July 2010, 10:07 PM   #6
ul9601 is offline ul9601  New Zealand
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Cool - thanks so much, Perry.
Cheers,
Sam
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Old 21st June 2012, 02:44 PM   #7
rctm is offline rctm  Portugal
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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.
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Old 28th September 2013, 09:50 PM   #8
ul9601 is offline ul9601  New Zealand
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Quote:
Originally Posted by rctm View Post
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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