What is this? Found inside my SDA 3.1's
xjghost
Posts: 1,101
When I moved one of my 3.1's I heard something inside. I pulled the PR and found this. It has threads in the 4 holes. Looks like it was glued to something or paper was glued to it. I have not pulled the other speakers yet. Everything sounds fine to me before I moved them.
HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's
Comments
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Looks like it could be the weight from the back of the passive radiator, pull the other one for comparison. The weight can be glued back on but be careful with the type of glue you use as it can eat or melt the Styrofoam.
Also be aware that the passive radiators (SW-122) for the SDA SRS 3.1TL are VERY rare and impossible to find so be careful.“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
Good idea on the comparison. I probably would have never thought of that. Any suggestions on glue if that is what it is?HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
Loctite Power Grab
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/ -
westmassguy wrote: »Loctite Power Grab
Thanks guys! I really appreciate you guys helping out an old fool who sometimes cannot remember @#$%! LOL! Isn't that the stuff recommended to stop magnet shift or is it something else it's recommended for in SDA upgrading?
HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
It's an acrylic adhesive/sealant, that dries clear, has no solvents or silicone.
You can use it to glue the magnet assemblies, and re-seal the cabinets internally with it. Best stuff I've foundHome 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 don't see how that can be the weight from your passive radiator. The weight is glued to the paper cone and covered by the dust cap. It can become loose and rattle, but it cannot come out of the radiator unless you cut the dust cap open.
By the way, there is no styrofoam in the 3.1tl's SW122. This passive radiator is quite a bit different than the ones used in the larger SRSs and previous generation SDAs. -
I guess a more detailed investigation is in order. FWIW I took this while I had it out....
HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
Looks like Alien metal found in New Mexico....
While your in there, check for air leaks in the cabinet too.HT SYSTEM-
Sony 850c 4k
Pioneer elite vhx 21
Sony 4k BRP
SVS SB-2000
Polk Sig. 20's
Polk FX500 surrounds
Cables-
Acoustic zen Satori speaker cables
Acoustic zen Matrix 2 IC's
Wireworld eclipse 7 ic's
Audio metallurgy ga-o digital cable
Kitchen
Sonos zp90
Grant Fidelity tube dac
B&k 1420
lsi 9's -
Looks like Alien metal found in New Mexico....
While your in there, check for air leaks in the cabinet too.
LOL! Alien metal! Funny! I thought the push test was the way to do that? Which I did right after I put the PR back in and all drivers moved freely and seemed to be fine. I got my larry's rings ready to go in these things and was about to order the dynamat.
HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
I don't see how that can be the weight from your passive radiator. The weight is glued to the paper cone and covered by the dust cap. It can become loose and rattle, but it cannot come out of the radiator unless you cut the dust cap open.
By the way, there is no styrofoam in the 3.1tl's SW122. This passive radiator is quite a bit different than the ones used in the larger SRSs and previous generation SDAs.
Actually If I remember right this 3.1 weight/passive problem happened to someone around here a couple years ago. He ended up cutting the dust cap off to fix the weight but couldn't find a big enough dust cap replacement. I think he ended up selling them without the dust cap on ebay.“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
Isn't that the stuff recommended to stop magnet shift or is it something else it's recommended for in SDA upgrading?
Thats JBWeld.
That said I just used Locktite to seal up my RS-II cabinets and plan to use it + gorilla glue on my 15" subwoofer cabinet kit as well.
"....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963) -
That's off one of the mid-drivers.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
gorilla glue
Do NOT use that garbage.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Looks like it could be the weight from the back of the passive radiator, pull the other one for comparison. The weight can be glued back on but be careful with the type of glue you use as it can eat or melt the Styrofoam.
Also be aware that the passive radiators (SW-122) for the SDA SRS 3.1TL are VERY rare and impossible to find so be careful.
gimpod wins and I loose!
Very depressed now!
Fell through the cone.... can that be fixed or replaced? westmassguy?
HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
Ouch!
Sorry, it looked like a mid-driver part to me.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
That sucks, I hate being right sometimes. I don't think it can be repaired (not sure) you'll most likely have to replace it.
It also might be a good idea to pull the other passive and give it a good look.“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
That sucks, I hate being right sometimes. I don't think it can be repaired (not sure) you'll most likely have to replace it.
It also might be a good idea to pull the other passive and give it a good look.
Yep did that. That is how I figured it out and found the hole.......HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
Looks like it could be the weight from the back of the passive radiator, pull the other one for comparison. The weight can be glued back on but be careful with the type of glue you use as it can eat or melt the Styrofoam.
Also be aware that the passive radiators (SW-122) for the SDA SRS 3.1TL are VERY rare and impossible to find so be careful.
gimpod wins and I loose! Very depressed now!
Fell through the cone.... can that be fixed or replaced? westmassguy?
Is the rest of the cone intact, and does it move freely?
What does the front of that PR look like?
It may be repairable.
I just checked, it has a disk shaped dust cap.
It may be repairableHome 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/ -
Wow, I am surprised too. I never saw a hole in the cone of a passive radiator. I don't know how that could have even happened.
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By the looks of the counterweight, it appears there wasn't enough glue applied. you can see where the material from the "plug/dust cap" tore off with the weight.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/ -
Damn! Sorry this happened to you. Repair may be possible? Replacement will be near-impossible. Please keep us informed.
Seeing this makes me want to JB Weld my 3.1TL passives now.......... Thanks for the inspiration.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."![:\](https://forum.polkaudio.com/resources/emoji/confused.png ":\")
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
Yea it looks to me that there wasn't a lot of glue. I know exactly how it happened. Me being dumb. These aren't really reachable and cannot be jb welded or glued sense the dust cover is there. I'll elaborate more later.HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
Oh wow, so sorry this happened to you. Hope things can be worked out!!
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I have got to give westmassguy props for his speedy and amazing repair. Thank you sir! Looking forward to putting these back where they belong. Now how it happened. Stupidity and impatience. I moved my speaker alone. I basically picked it up from behind spun around and then set it down. I did it to both of them actually. Apparently this one was set down harder and the weight was not as secure as the other one. Thanks for the repair sir! I did some checking and the PR in my Monitor 12 is identical in looks and style to this one. I posted a thread asking if anyone knew if they were but no one has responded. Is there any way to get the specs form Polk on them? Again Thanks westmassguy!HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
More than welcome. There is usually a model # hand-written in grease pencil on the back of the basket.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/ -
westmassguy wrote: »More than welcome. There is usually a model # hand-written in grease pencil on the back of the basket.
Yes there are stickers on both. SW-122 and SW-123. I have Dynamat on order and bought some Lock tight from Lowes this week. Maybe I can find the time to install the rings and all this soon!
HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
I can make a guess about the differences between the SW122 and SW123 based on what I know to be the differences between the SW150 and SW155. The metal weight inserted into the styrofoam disc of the SW150 is 70 grams, while the weight for the SW155 is 40 grams. The SW150 is used in the SRS 1.2tl, and because of the larger cabinet size, it can be tuned lower than the SW155 which is used in the SRS 2.3tl.
My hypothesis is that the SW122 is very similar to the SW123, but with a heavier weight, since the 3.1tl has a larger cabinet than the Monitor 12 Series 2. Unfortunately, I do not know exactly how many grams each weight is. I am also not sure if this information was ever published. The only reason I know about the 15" passive radiators is because I bought a used pair of 2.3tls in the 1990s where one cabinet had a SW155 and the other had a SW150. There was a 3 dB reduction in bass output in the cabinet with the incorrect SW150. Fortunately, it was easy enough to cut away at the weight until it was close to 40 grams. -
The Repair:
Set up and in use:
Not too good of a picture but you get the idea.HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's -
Hello Folks,
Just did some searching around a lucked into this thread. I've got a pair of 3.1's with the same issue, but fortunately the weight is just loose and has not torn through the cone. I noticed that the left seemed muddled today, so I popped of the PR and looks like it was only bouncing around for a short while.
I assume that westmassguy fixed these for you xjghost. How does the dust cap repair look? I don't want to end up like the fella gimpod mentioned that could not find a big enough cap replacement.
Regards,
Mike -
westmassguy did a jam up job. I'll try and post some pictures of the two PR's and you can see if you can tell which one is the one he fixed......HT/2Channel: Emotiva MMC-1, Adcom GFA-555II, Polk SDA 3.1's, Teac TN-300 TT, Polk Center and Sub.
Bedroom system: Carver CT-24, Parasound HCA-800II, Monitor 10's
Additional projects: RTA 12c's
