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
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
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
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
I think the jumper was to bypass the processor loop (which was to allow the use of an equalizer) but I'm not sure.
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
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
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.
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.
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
Update... and more questions:
I "borrowed" the 9 pin din plug from another pioneer component of the same era (casette player only, which came in a box of stuff, including the aforementioned GM40 and a pair of ts-x6 speakers, too bad these were pretty knackered), and spliced them all up.
The interference whine is gone, so it must have been the pre-amp.
Because there are only two speaker outputs from GM40, i only have a pair of co-axials in the front door at the moment. Now I'm back to thinking about adding a sub at the back and possibly ditching the co-axials with dedicated twitters and woofers with passive crossover.
According to GM40 manual, another pair of speakers can be added by putting them in series as long as the total impedance falls between 4 & 8 ohms.
The sub amp I have has a provision for high level signal input, so I'm guessing I can tap into the speaker wires to feed the sub amp that way.
Questions:
1. Do I hook up the high level signal in series or in parallel with the existing speaker? Since it's only feeding the amp with signal I'm guessing it's not seeing the impedance of the subwoofer, so parallel will work fine.
2. Would it work tapping the signal from one of the two speakers? I don't think I would need two subwoofers, and definitely two will eat up all the space I have.
I "borrowed" the 9 pin din plug from another pioneer component of the same era (casette player only, which came in a box of stuff, including the aforementioned GM40 and a pair of ts-x6 speakers, too bad these were pretty knackered), and spliced them all up.
The interference whine is gone, so it must have been the pre-amp.
Because there are only two speaker outputs from GM40, i only have a pair of co-axials in the front door at the moment. Now I'm back to thinking about adding a sub at the back and possibly ditching the co-axials with dedicated twitters and woofers with passive crossover.
According to GM40 manual, another pair of speakers can be added by putting them in series as long as the total impedance falls between 4 & 8 ohms.
The sub amp I have has a provision for high level signal input, so I'm guessing I can tap into the speaker wires to feed the sub amp that way.
Questions:
1. Do I hook up the high level signal in series or in parallel with the existing speaker? Since it's only feeding the amp with signal I'm guessing it's not seeing the impedance of the subwoofer, so parallel will work fine.
2. Would it work tapping the signal from one of the two speakers? I don't think I would need two subwoofers, and definitely two will eat up all the space I have.
No power
Hey guys need info I just bought a car with this same pioneer unit and it has no amp so I assume that is what powers it up?
Hey guys need info I just bought a car with this same pioneer unit and it has no amp so I assume that is what powers it up?
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