Polyfill or No Polyfill behind Passive Raditors on Model 10s ????

coral191

I am replacing a driver & resealing all of them on Polk Model 10s. The cabinet behind the PRs are packed with Polyfill. (from the factory in 1977)

Should I remove it behind the PRs? All or it ? or part of it?
And..if so, why did Polk put it there to begin with?
Thanks

westmassguy

Normally, the bottom section is completely empty on later models. Polk made many adjustments, or refinements as the models progressed. Try it with and without, and see which sounds best to you. In the end, that's all that matters.

Nightfall

It fell down from the top. Push it back up, staple it if you want.

coral191

Well, the top section is totally packed with fill already. There is no way there would even be room up there for half the fill that is behind the PRs. The pieces behind the PRs are obviously cut & placed to fill that area. Maybe Polk started doing then differently later, as these are real old plain Model 10s.

So I guess the question is, regardless of why its in there, would the speakers sound better with the poly out from behind the PRs?

coral191

FYI-I finished replacing 2 drivers and resealing everything with Armaflex on these old Model 10s. Man, they were packed full of polyfill, everywhere....I cut it off just below the drivers and removed all of it from behind the PRs...it just kept coming & coming. Uncompressed, just the polyfill from the lower half of the 2 speakers filled a 40 gallon trash bag.

I didn't know how it would turn out going from packed full behind the PRs to none at all behind them, but there is a very noticeable increase in bass and the tightness & definition was much better

JNinja

So it sounds better now? I wonder what the pony/reasoning was in the first place..