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Help with some plate amps
Help with some plate amps
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Old 13th September 2008, 11:47 PM   #1
mazeroth is offline mazeroth  United States
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Join Date: Jul 2004
Location: United States
Default Help with some plate amps

Sorry if this doesn't fit the diy theme of the forum but I could really use some help from some other diyers.

I just purchased these Polk speakers off ebay which are a really good deal:


These sold for $1000/pair when I worked at Circuit City and since I was looking for some bedroom speakers to build but could get these much cheaper and probably outperform them (for the price) I figured why not. Long story short, owner was very friendly and the speakers were in very good condition. It's 2.5 hours away but we were on a trip so I snagged them while we were up visiting, didn't have time to try them out due to my wife having to get to work, and off we went. I just now had a chance to play them and their amps aren't working properly. With the speaker jumper in place to get the signal from the speaker line, the sub doesn't play. After further investigation (taking the amp out and playing around with wires) I've figured out the following:

The speaker input goes from the banana plug to the amp. Then there are two sets of wires out from the amp. One is a pair of 16 gaugish wire that runs to the sub providing power (up to 70w). The other has a plug on the end going into two wires. These wires go into the sub area as well (both go through a hole of MDF into the sub chamber but I can't see what they plug into). With the connector plugged into the amp the subwoofer is playing FULL RANGE audio. When I unplug it the sub plays nothing. If I disconnect the red (+) jumper the sub still plays full range audio, but if I disconnect the black (-) jumper the sub barely at all plays, but it does. Good times.

If I bypass the speaker level inputs and just use RCA inputs it works flawlessly. That would be fine and dandy but I'm using a small T-Amp for the bedroom and I don't have that option. Plus, I purchased these thinking they were fully functional, which they're not.

I think I've tested just about everything I could. Any ideas how to fix these or are they toast?

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Old 14th September 2008, 12:31 AM   #2
lineup is offline lineup  Sweden
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Join Date: Dec 2005
Location: the north
Unless somebody actually have knowledge about these devices
it is hard to know what can be the fault.

Is it just you have not connected wires right?
Or is the device defect?

Sometimes one subwoofer section
can be connected in a bit strange way.
Not purely one wire for + and one wire for - (ground).

I should advice you to try to get one User Manual for that system.
Even better would be one Service Manual
... but user manual would be good to start with, I think.
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