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09-23-2007, 05:35 PM
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Junior Head-Fi'er
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Join Date: Sep 2007
Posts: 2
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Koss Pro/4AAA
Hi, a friend of mine gave me a set of Koss Pro/4AAA headphones to repair. He tried to solder a loose / open connection and made a mess with splatter etc. When I got them three of the five wires in the input ear piece where not attached and he can’t tell me which wire goes where. Three wires from cable in and two from other ear piece. I thought it would be easy to figure where each wire goes but I’m not sure. There are two wires that go to other ear piece and which have not been disturbed in the ear piece. I think that there are two signal (channel) wires (red and white) and a common ground (black). Do I solder them as in the picture?
Thanks, Jay
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09-23-2007, 10:02 PM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: Orem, UT
Posts: 7,030
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Probably.
If the Pro4AAA is like my Pro4AA, the enraging part is that they didn't mark + and - on the drivers.
If they did mark + and - on the drivers, the tip on the headphone jack is left, the ring is right, and the sleeve is ground. You should be able to use an ohm meter to figure out the rest.
__________________
Server rebuilt - better, stronger, faster. Still busier than a one-legged man at a butt-kicking contest, though.
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Team Planar | Team Sturzhelm | Team Cheap Bastards | Team Baby Stax
If the monster is immortal, either it does not exist, or there are two.
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WTB: Your broken iAudio 7
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09-25-2007, 02:21 PM
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Junior Head-Fi'er
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Join Date: Sep 2007
Posts: 2
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All phono plugs have three wires just as you described. So my question would be is it OK to use a common ground? By the way, the speakers are not marked + and - and they are mounted 180 opposite each other. In other words + may be on the top of one speaker but on the bottom of the other. I believe this is important to keep them in phase. / J
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04-22-2009, 03:54 AM
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500+ Head-Fi'er
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Join Date: Jul 2002
Location: Winter Haven, Florida USA
Posts: 863
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Arma, are you trying to figure out how to get access to the inside wiring to the drivers?
If so, the outside cups just snap into place. If I can get access to photos (I'll have to dig around) I have taken, it shows how to pry the outer cups out so you can get access to the driver wiring.
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04-22-2009, 04:11 AM
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500+ Head-Fi'er
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Join Date: Jul 2002
Location: Winter Haven, Florida USA
Posts: 863
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Last edited by itza2mer; 04-22-2009 at 04:18 AM.
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04-22-2009, 12:03 PM
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Junior Head-Fi'er
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Join Date: Apr 2009
Posts: 2
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Hi itza2mer,
Thank You very much!!!
Now my headphones (on both sides) sound as when my father bought them! 
Thank You again and Best Regards from Italy!
Armando
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