Dynamat applied

NJPOLKER
NJPOLKER Posts: 3,474
edited January 2010 in Vintage Speakers
Here are a few pictures of the passive radiator for my SDA2a's that have Dynamat Extreme applied. I have done the drivers and this passive so far for the right channel and will do the left channel next,then on to my SRSII's. How did I do? Did I appy too much, not enough or just right? I worked the Dynamat into every nook and cranny. Jesse was right once upon a time when he said Dynamat is affordable or something like that. I spent about $20 and it will be more than enough to do both pair of SDA's. Now, will I hear a difference? I don't know but it won't degrade the sound quality thats for sure and I enjoy the process.
Drew
Post edited by NJPOLKER on
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  • DollarDave
    DollarDave Posts: 2,575
    edited October 2008
    In the first picture you have waaaay to much applied - you covered the entire speaker? Looks like you did better after testing it...
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  • F1nut
    F1nut Posts: 50,753
    edited October 2008
    Geez, all I did was the spokes and that was plenty. You should not have applied it to the rim because that seal is very important to the proper function of the speaker design.
    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

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  • ben62670
    ben62670 Posts: 15,969
    edited October 2008
    I need to do this myself, but I have 38 drivers to do this to. I agree with F1nut even a quarter sized piece with stop any ringing. It should be applied to just the spokes.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited November 2008
    I didn't apply the Dynamat so that it effects the seal around the speaker. So, I got alittle carried away with the Dynamat I guess :) . On the drivers I only did the spokes so thats good, its the only area I could Dynamat or I probably would have done more. Should I add alittle to the back of the magnet on the tweeters?
    Thanks for your feedback guys.
    Drew
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  • MillerLiteScott
    MillerLiteScott Posts: 2,561
    edited November 2008
    The idea is to dampen the ringing characteristic of the stamped steel baskets. Not needed on the magnet of the tweeter. Once you have applied a moderate amount of dynamat to the basket spokes. Tap the basket with your finger and it should have a non resonate sounding thunk. Try it on a basket before you apply the dynamat for a comparison. You will hear the difference and know when you have applied enough.

    Scott
    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D
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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited November 2008
    Thanks Scott I got it now.
    Drew
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  • F1nut
    F1nut Posts: 50,753
    edited November 2008
    Sorry Drew, I looked again and see that you didn't cover the actual rim, but damn you got everything else. ;):)
    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

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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited November 2008
    F1nut wrote: »
    Sorry Drew, I looked again and see that you didn't cover the actual rim, but damn you got everything else. ;):)

    And its all your fault!!! Since you said it is soooooooo affordable I did just about everything. I even tried alittle on my wifes **** but she was too fast.
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  • tx_polkhead
    tx_polkhead Posts: 248
    edited November 2008
    NJPOLKER wrote: »
    And its all your fault!!! Since you said it is soooooooo affordable I did just about everything. I even tried alittle on my wifes **** but she was too fast.

    Pics, we demand photographic evidence!
    Polk Audio RTA 12c's, Monitor 7c, Monitor 5JR+, SDA CRS+
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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited November 2008
    tx_polkhead wrote: »
    Pics, we demand photographic evidence!

    Maybe I'll get them once she goes to sleep tonight. I may get banned but it will be worth it, I won't be forgotten for awhile
    Drew
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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited November 2008
    I completed the Dynamat process on the drives and passives for my SRSII's and fired them up today. I pretty much did the spokes with alittle on the center area and still have a couple square feet left over.
    I cranked up some Jeff Beck Fleetwood Mac Aja and gotta say the mids to lows seem alittle tighter. Not a big difference in sq and in reality maybe no difference at all but well worth my $20.00
    Drew
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  • MillerLiteScott
    MillerLiteScott Posts: 2,561
    edited November 2008
    You will sleep just a little better tonight. :rolleyes:

    Scott
    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D
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  • NJPOLKER
    NJPOLKER Posts: 3,474
    edited November 2008
    I have a few budweisers going and cranking some tunes so I will sleep well.
    Thanks for everyones thoughts and advice on this simple and inexpensive improvement.
    I swear I hear sweeter music!!!
    Drew
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited July 2009
    F1nut wrote: »
    Sorry Drew, I looked again and see that you didn't cover the actual rim, but damn you got everything else. ;):)
    Can anyone provide pics of the proper way to do this?

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited July 2009
    TECHNOKID wrote: »
    Can anyone provide pics of the proper way to do this?

    Cheers!
    TK

    All you have to do is cover the spokes of the baskets. Here is my thread on it.

    http://www.polkaudio.com/forums/showthread.php?t=52810&highlight=Dynamated
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  • schwarcw
    schwarcw Posts: 7,341
    edited July 2009
    Highly recommended and inexpensive. I used Mortite in conjunction with the Dynamat. It really helped to clean up the image. More focused and detailed. I was surprised how much this small tweak would help.
    Carl

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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited July 2009
    hearingimpared wrote: »
    All you have to do is cover the spokes of the baskets. Here is my thread on it.

    http://www.polkaudio.com/forums/showthread.php?t=52810&highlight=Dynamated
    Great, thanks! This LOL really got my attention:
    This innocent sounding task was no picnic. First off the Dynamat is like soft formed tar. Very messy when you have to use your kitchen table to cut it. BTW I was picking out little balls of tar out of mine and the dog's hair (how the heck it got on him is beyond me) and the next day after a shower I was picking pieces off my ear???
    :D, I can just picture this LOL!
    schwarcw wrote: »
    Highly recommended and inexpensive. I used Mortite in conjunction with the Dynamat. It really helped to clean up the image. More focused and detailed. I was surprised how much this small tweak would help.
    Can you emphasize how you would do this part?
    Mortite putty has also been applied to the metallic structure supporting the magnet for a dynamic speaker to cut unwanted resonance of the metal structure, leading to improved speaker performance.

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited July 2009
    So $20 worth of the Dynamat Xtreme was enough to do both of your 2A's? If that's all it costs, I might have to do that to mine soon. I'd probably get a little extra and do my Monitor 7A's at the same time.
    The nirvana inducer-
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited July 2009
    comfortablycurt wrote: »
    So $20 worth of the Dynamat Xtreme was enough to do both of your 2A's? If that's all it costs, I might have to do that to mine soon. I'd probably get a little extra and do my Monitor 7A's at the same time.

    Curt, less than a sheet did all 16 of my MWs and my two passive radiators on my 1.2 TLs.
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited July 2009
    hearingimpared wrote: »
    Curt, less than a sheet did all 16 of my MWs and my two passive radiators on my 1.2 TLs.

    Good to know. A sheet should be plenty for my 2A's and 7A's then...with a bunch left over for future projects.:)
    Lasareath wrote: »
    Where can I get the Mortite?

    +1

    I've looked for it at Menards and Farm and Fleet before...with no luck. Am I going to have to get in online?
    The nirvana inducer-
    APC H10 Power Conditioner
    Marantz UD5005 universal player
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    Parasound HCA-1200II power amp
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    Audioquest Speaker Cables and IC's
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited July 2009
    Lasareath wrote: »
    I figure if I'm going to open up the speakers I might as well do the mortite and redo the binding posts too

    Sal,

    I found Mortite on amazon.com...

    http://www.amazon.com/Thermwell-F4-Grey-Caulking-Cord/dp/B000BQNCY4/ref=sr_1_2?ie=UTF8&qid=1248759808&sr=8-2

    ...It shows it at $2.88 for a 45' roll. Sounds like another very inexpensive tweak. They have it in other colors, and in larger quantities too.

    I'm probably going to pick up some Mortite and Dynamat Extreme sometime in the next few weeks.


    I'm debating whether or not it'd even be worth it to Mortite my M7A's...When I push in the PR, it takes over 20 seconds for the MW to return to it's resting position. Is the Mortite really going to improve upon that?
    The nirvana inducer-
    APC H10 Power Conditioner
    Marantz UD5005 universal player
    Parasound Halo P5 preamp
    Parasound HCA-1200II power amp
    PolkAudio LSi9's/PolkAudio SDA 2A's/PolkAudio Monitor 7A's
    Audioquest Speaker Cables and IC's
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited July 2009
    What I have read on the mortite so far is that it is a temporary solution only. Will hardened with times etc... Any comments?
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • Toolfan66
    Toolfan66 Posts: 17,333
    edited July 2009
    Mortite stays soft. You can get it at Home Depot but it's under a different name.

    MD

    http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100353483&N=10000003+90051+502027
    Polk Audio SDA 2.3tl Fully Hot Rodded. 😎

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  • hearingimpared
    hearingimpared Posts: 21,136
    edited July 2009
    I wonder if Parts Express speaker sealer is made with the same substances as Mortite?
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  • Face
    Face Posts: 14,340
    edited July 2009
    My local Home Depot sells it under the Mortite name. I found it in the same area as weatherstripping.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • jimbo1421
    jimbo1421 Posts: 772
    edited July 2009
    hearingimpared wrote: »
    All you have to do is cover the spokes of the baskets. Here is my thread on it.

    http://www.polkaudio.com/forums/showthread.php?t=52810&highlight=Dynamated

    I Dynamatted my Monitor 7As today. Tapping around on the basket of the PR with a screwdriver it sounds like the flat back is the most ringing part, making a "tinngk" sound. The spokes sound flatter, sort of a "tangk" sound. So I applied Dynamat Extreme to both the back and and spokes. Now the tapping response all over is somewhere between a "tak" and a "tuk". Or maybe "tök".

    What I wonder, though, is didn't the engineers hear this ringing and somehow deal with it in the design of the speaker? Why didn't Polk apply a dampening material in the factory, at least to the top of the line speakers?

    Jim
    5.1 System:
    TCL R613 55" 4K
    Front: SRS-3.1TL
    Center: CS400i
    Surround: Monitor 10B
    PSW10 subwoofer
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    2.0 Office System:
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  • Tony M
    Tony M Posts: 11,189
    edited July 2009
    I plan on doing the dynamat upgrade to my SDA'S and the cross-over upgrade too.I think it would make a hearable difference from what I've read here on the Forum.

    I ALSO:rolleyes:pondered ,did the engineneers consider this (basket damping)or was it just one of those moments a human gets a brainstorm from above.I wonder if the enginneers ever put a sensor on a basket during reshearch?

    Just think, a card in the spokes of a bicycle....there had to be a first to do that too. I know we could go on and on ,Sliced bread,THE WHEEL...but this basket tweek sounds like it works.

    I just thought :rolleyes:, how about a carbon fiber basket or Kevlar or fiberglass, would they ring?
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited July 2009
    tony millard wrote: »
    I just thought :rolleyes:, how about a carbon fiber basket or Kevlar or fiberglass, would they ring?

    No but they'd be damned expensive.
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  • Tony M
    Tony M Posts: 11,189
    edited July 2009


    I thought that too. Wilson Audio could try it.:D
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited July 2009
    tony millard wrote: »
    I thought that too. Wilson Audio could try it.:D

    Wilson probably already does.:)
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