Please help me fix my SDA-1 wiring!
jimreeves
Posts: 57
I just picked up a pair of SDA-1A's cheap and need your help to reconnect the crossover wiring properly. The former owner said he wired them for bi-amping and said they could be returned to original in a few minutes. Maybe so, but he doesn't remember which wires go where! I'm a newbie to this kind of network so your help is greatly appreciated.
See the attached pics, here's what I see.
1)The black and white interconnect plug wires are disconnected.
2)The black wire from the red terminal post is soldered to the lower board.
3)The white wire from the black terminal post is plugged into the upper board.
4)A black wire is plugged into the lower board next to the larger coil, this wire ran to the upper board at the crimp connector but has pulled out. (I suspect that this lower board connector originally accepted the interconnect black lead but I'm not sure.)
5)There is a cut blue wire, lower board, next to the larger coil and the black connector mentioned in #4. Should be a signal wire, but to what? Pic 2
6)Another cut blue wire and a cut white wire, lower board, next to the smaller coil, signal and common assumed, but to what? Pic 2
7)On the upper board there is a cut black wire and a cut white wire closest to the the smaller coil, shown at upper right in pic 3.
Above this mess he has spliced several black and blue wires together and several white wires together. I've yet to pull all the drivers to see which goes where. I have only a basic understanding of schematics but that would help.
If you have pics of your boards properly connected that would be perfect. As I said any input would be much appreciated!:o
See the attached pics, here's what I see.
1)The black and white interconnect plug wires are disconnected.
2)The black wire from the red terminal post is soldered to the lower board.
3)The white wire from the black terminal post is plugged into the upper board.
4)A black wire is plugged into the lower board next to the larger coil, this wire ran to the upper board at the crimp connector but has pulled out. (I suspect that this lower board connector originally accepted the interconnect black lead but I'm not sure.)
5)There is a cut blue wire, lower board, next to the larger coil and the black connector mentioned in #4. Should be a signal wire, but to what? Pic 2
6)Another cut blue wire and a cut white wire, lower board, next to the smaller coil, signal and common assumed, but to what? Pic 2
7)On the upper board there is a cut black wire and a cut white wire closest to the the smaller coil, shown at upper right in pic 3.
Above this mess he has spliced several black and blue wires together and several white wires together. I've yet to pull all the drivers to see which goes where. I have only a basic understanding of schematics but that would help.
If you have pics of your boards properly connected that would be perfect. As I said any input would be much appreciated!:o
Infinity QLS1, Polk SDA-1A, OLAdvent Econowave, Yamaha RXV-1300, CDC-685, P2200, AB International 9220A, Rane ME15B, Cambridge Audio 640P, Grant Fidelity B-283, Luxman PD277-AT7V, Pioneer PL707-Denon DL-207, DL-160....And projects on the bench!
Post edited by jimreeves on
Comments
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Welcome to the polk forum.
You will find some photos in this thread. The schematic you desire is located in the sticky originated by Darque Knight. If you study the schematic you will see it's a pretty simple deal. You need to remember that the large inductor (wire coil) is on the low pass (big speaker) circuit and the small inductor is on the tweeter circuit. The big yellow thing is the capacitor in the tweeter circuit. Be sure to get the speaker polarity correct. Also search the forum for the correct resistances for each speaker so you can check your results. If you create a short circuit, the speakers can ruin your amp.
The white wires are the neutrals and I think you will find that they all terminate to the same trace so it doesn't matter too much which one you use. If I recall correctly (and I may not what with the mad cow and all) the blue wires are for the dimensional array drivers. In this particular model you have an array bass driver and an array tweeter. If you read the thread above you will find a discussion of the placement of these drivers and a discussion concerning the pros and cons of not hooking up the array tweeter.
Good luckThe world is full of answers, some are right and some are wrong. - Neil Young -
Thanks for your post dcmeigs, I get the general idea from what you describe and will read up.
Do I assume correctly that the lower board serves the dimensional array while the upper board serves the mains, since the blue wires terminate on the lower board?Infinity QLS1, Polk SDA-1A, OLAdvent Econowave, Yamaha RXV-1300, CDC-685, P2200, AB International 9220A, Rane ME15B, Cambridge Audio 640P, Grant Fidelity B-283, Luxman PD277-AT7V, Pioneer PL707-Denon DL-207, DL-160....And projects on the bench! -
With your help and the schematic I've got them rewired as stock! I thought that figuring out two modules would make it more difficult, but once I realized that two separates the stereo and dimensional networks it made the task easier. As soon as I find a few more MW6501's and a interconnect cable I'll be able to try them out! Good thing I like a challenge.;)
I noticed that the MW6501's installed were rebadged MW6502's (label glue let go). Is there a difference? It appears there are numerous versions of this driver, what are the differences?
Is there a SDA cable currently available for these SDA-1A's?
Thanks!
JimInfinity QLS1, Polk SDA-1A, OLAdvent Econowave, Yamaha RXV-1300, CDC-685, P2200, AB International 9220A, Rane ME15B, Cambridge Audio 640P, Grant Fidelity B-283, Luxman PD277-AT7V, Pioneer PL707-Denon DL-207, DL-160....And projects on the bench!
