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View Full Version : MONITOR and SDA series woofers


Gary Batson
06-11-2007, 10:12 PM
Polk made a lot of 6.5 in. woofers for their monitor series and SDA series speakers that all look the same but different model numbers. Does anyone know the differences between these speakers and if any of them are interchangeable?

What are the new replacement woofers from Polk like? Do they look the same? I think I read somewhere that they're not sticky. I'm sure the originals were sticky for a reason.
ben62670
06-11-2007, 10:19 PM
There were a few 4ohms versions, and several 8ohm versions. The early MW6500 was very efficient, but bottomed out if overly driven. It slowly worked up to the 6503 which handled more power, and resisted bottoming out. As for the sticky part I don't know if the originals came sticky, or got sticky after a couple years.
F1nut
06-11-2007, 10:31 PM
All the drivers are designed with different specs and therefore are not really interchangeable. The original drivers came sticky and as far as I know the replacements are too.
Jockos
06-11-2007, 10:58 PM
Are the new replacements out already, ie 6510, 6502?
ben62670
06-11-2007, 11:02 PM
Are the new replacements out already 6510ie?

Nope I just ordered the other day.
I don't know about the 6502
MillerLiteScott
06-11-2007, 11:14 PM
Why are they sticky?
Gary Batson
06-11-2007, 11:14 PM
There were a few 4ohms versions, and several 8ohm versions. The early MW6500 was very efficient, but bottomed out if overly driven. It slowly worked up to the 6503 which handled more power, and resisted bottoming out. As for the sticky part I don't know if the originals came sticky, or got sticky after a couple years.

Yep; My SDA 1's were sticky the day I bought them in 1983. I'm surprised they haven't dried up after all these years. Some things are just better sticky.:D
F1nut
06-11-2007, 11:24 PM
Why are they sticky?


It's doped paper, which helps the cone keep it's shape.
Gary Batson
06-11-2007, 11:27 PM
Why are they sticky?

Just a guess, But I think it was used as a damping material. Polk literature says they use a three layer cone construction. It must be one of the layers. And I've seen mentioned somewhere before about a damping material used in the cone.
Jockos
06-12-2007, 01:36 AM
I read somewhere that the sticky coating reduces resonance and leads to cleaner midrange.

Jockos