SDA 1C Question
Faustin
Posts: 1,149
Have my SDA 1c's apart to dynamat, seal etc. Noticed that there are 2 pieces of dacron rolled up positioned behind the 4) 6.5 drivers, one on either side of the brace. There is nothing behind the tweeters or the passive radiator. I am pretty sure having nothing down on the bottom is correct but all my other Polk speakers have dacron on the top behind the tweeters. Shouldthere be dacron rolled up behind the tweeters??
Post edited by Faustin on
Comments
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yes as much as you can get in there behind tweeters....Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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Hmm. I wonder where it went. Parts Express the best place to order some from?
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I replaced the stock polyfill in my SRS 1.2s with Accosta Stuf from Parts Express. Works fine. You just have to determine the right amount to use. Unlike BKphoto, above, I do not think you can just use as much as will fit in the cabinet. If you get too much, I think it dulls the sound.
However, others on this Forum can give you more experienced advice than I.Family Room, Innuos Statement streamer (Roon Core) with Morrow Audio USB cable to McIntosh MC 2700 pre with DC2 Digital Audio Module; AQ Sky XLRs to CAT 600.2 dualmono amp, Morrow Elite Speaker Cables to NOLA Baby Grand Reference Gold 3 speakers. Power source for all components: Silver Circle Audio Pure Power One with dedicated 20 amp circuit to main panel.
Exercise Room, Innuos Streamer via Cat 6 cable connection to PS Audio PerfectWave MkII DAC w/Bridge II, AQ King Cobra RCAs to Perreaux PMF3150 amp (fully restored and upgraded by Jeffrey Jackson, Precision Audio Labs), Supra Rondo 4x2.5 Speaker Cables to SDA 1Cs (Vr3 Mods Xovers and other mods.), Dreadnaught with Supra Rondo 4x2.5 interconnect cables by Vr3 Mods. Power for each component from dedicated 20 amp circuit to main panel, except Innuos Statement powered from Silver Circle Audio Pure Power One. -
tweeters....stuff it....Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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First Guess: Nobody removed any Dacron. It's just compressed. You don't need "more", you just need to re-distribute the rolls.
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I don't think it is compressed. My 10's and 12's have more dacron in them than these. Just trying to find out from others that have a set of 1c's if this is normal.
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My 1Cs, which I bought new in 1989 and never opened up till the last year when I mod'd them, each had one cylinder shaped roll of polyfill that was placed in the center of the cabinet from the lowest point in the cabinet behind and between the MWs to the top of the cabinet behind the tweeters.
I can't tell whether you have more than was in my 1Cs or it has simply fallen so that is only behind the MWs and on the sides, rather than in the center of the cabinet.Family Room, Innuos Statement streamer (Roon Core) with Morrow Audio USB cable to McIntosh MC 2700 pre with DC2 Digital Audio Module; AQ Sky XLRs to CAT 600.2 dualmono amp, Morrow Elite Speaker Cables to NOLA Baby Grand Reference Gold 3 speakers. Power source for all components: Silver Circle Audio Pure Power One with dedicated 20 amp circuit to main panel.
Exercise Room, Innuos Streamer via Cat 6 cable connection to PS Audio PerfectWave MkII DAC w/Bridge II, AQ King Cobra RCAs to Perreaux PMF3150 amp (fully restored and upgraded by Jeffrey Jackson, Precision Audio Labs), Supra Rondo 4x2.5 Speaker Cables to SDA 1Cs (Vr3 Mods Xovers and other mods.), Dreadnaught with Supra Rondo 4x2.5 interconnect cables by Vr3 Mods. Power for each component from dedicated 20 amp circuit to main panel, except Innuos Statement powered from Silver Circle Audio Pure Power One. -
Bruce, I wouldn't over-think it too much. As long as the Dacron is behind the two woofers on each side, I think you'll be fine. The bottom of the roll should be no lower than the bottom of the lower woofer opening. Tack it in place so it doesn't slide down, and move on to the rest of the upgrades.Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
I would tend to agree with Westmass on this. Especially if you are going to use any black hole in the upgrades. The dacron appears to be in place primarily to help slow/ prevent reflections from bouncing back into the cones of the midwoofers. Cabinet fill can alter the "effective internal volume" by slowing the backwave but dacron does not perform theis function very well unless packed pretty tightly. I would use what you have and add the black hole which will make much more of a difference.If con is the opposite of pro, is Congress the opposite of Progress?!
Monitor 5Jr, Monitor 5, RTA12, RTA 15TL, SDA 2A, 1c, SRS 2, 1.2TL, CRS, Atrium. -
Are you doing the Larry Rings?? Amazing results to be had if you are!"if it's not fun, it's not worth it & remember folks, "It's All About The Music"!!
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