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Thread: Dynamat-ing

  1. #1

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    Default Dynamat-ing

    I am slowly starting to warm up to the idea of modding my new-to-me SDA SRS's. I've had them for a month or 2 now, so I know the sound. I got the new tweeters, and am thinking about the Dynamat/ JB Weld mod to the mids/base drivers. There're sure are quite a few choices as far as size and amount for the Dynamat. Which is the best choice for what I'm about to do? Thanks in advance.

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    I used the Dynamat Extreme and a believe that is what is recommended. Check ou this site, http://vr3mods.com/LCSDAUpgrade.php
    Home Theater
    Onkyo PR-SC5508 Sharp LC-70LE847U
    Emotiva XPA-5 Emotiva XPA-2 Emotiva UPA-2
    Front RTi-A9 Wide RTi-A7 Center CSi-A6 Surround FXi-A6 Rear RTi-A3 Sub 2x PSW505
    Sony BDP-S790 Dishnetwork Hopper/Joey Logitech Harmony One Apple TV
    Two Channel
    Oppo 105D BAT VK-500 w/BatPack SDA SRS 2.3 Dreadnought Squeezebox Touch Apple TV

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    ^^^^ What he said^^^^^^^ I ordered mine at O Reilly auto parts and got it the same day.
    Last edited by heartystatue; 10-05-2013 at 09:25 AM.
    HT: LSI15, LSIC, LSIFX, Emo XPA-3 Onkyo TXNR809, Sony BDP-S500, PannyDMP-BDT320, MIT S1 SC. Mit 73842dlp
    2ch: SDA-SRS 2.3 Fully modded. BAT VK500 w/batpak, BAT VK5I
    TT, cd player, In my near future.

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    Here is a less expensive alternative that I have used in cars, and I'm planning to do some speakers once the weather takes a turn - http://www.fatmat.com

    Good luck!

  5. #5
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    I like the 110mil GTmat.

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    Check the local Craigslist or eBay. I got lucky and found a trunk kit for $30.
    Usher CP-6311, Shuguang S200MK, Shuguang S845MK, Pioneer BDP-51fd, Douglas IC's, AQ cv-8 SC's, Pangea/Douglas PC's, Epson 8100

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    +1 on the Fatmat. A bit cheaper and for all intents and purposes it's the same thing. Comes with a roller, disposable knife and in different thicknesses too.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills, polyswitches removed, Lg Solen inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR binding posts, upgraded IC Cable, Black Hole Damping Sheets (3" strips) installed on back wall behind MW's & Tweeters, interior of cabinets sealed, AI-1 interface with 1000VA transformer

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    Thanks for the info. How much is needed? Do you have to cover all surfaces completely?

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    The cheapest place I've found is eBay. The "wedge pack" is 4 sq ft, around $25.00 shipping included, and will do the smaller SDAs with a bit to spare, so your SRSs will need two kits, or the "trunk" kit, 20 sq ft, $90.00, which is most likely too much.
    Some say you don't have to cover every sq inch, but I prefer to err on the side of caution, and cover every part of the basket, except the lip down by the flange. The first time I Dynamatted, I did the lip, and because it increases the diameter of the basket frame, the drivers wouldn't fit in the holes. Lesson learned. I use paper plates or jar lids as patterns. For the woofers, I cut a doughnut shaped piece, then cut the doughnut in half and slide it under the magnet. The "spokes" can be cut from the scraps left over from the round cutouts. I then use the back side of a 1" wood chisel to smooth out the Dynamat, making sure I have 100% contact, and also use it to round over any sharp edges. Be sure to cut out the center hole in the PRs, otherwise you'll change the T/S parameters.
    For gluing the magnet assemblies, I switched to Loctite Power Grab, clear acrylic adhesive instead of JB Weld or epoxy. It's easier to work with, dries clear, and cleans up with soap and water.

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    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350

    "So is there any tread left on those tires or is it just like throwing a hotdog down a hallway?"

    www.dhsspeakerservice.com

  10. #10

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    ^^Very nice and neat job^^
    Home Theater
    Onkyo PR-SC5508 Sharp LC-70LE847U
    Emotiva XPA-5 Emotiva XPA-2 Emotiva UPA-2
    Front RTi-A9 Wide RTi-A7 Center CSi-A6 Surround FXi-A6 Rear RTi-A3 Sub 2x PSW505
    Sony BDP-S790 Dishnetwork Hopper/Joey Logitech Harmony One Apple TV
    Two Channel
    Oppo 105D BAT VK-500 w/BatPack SDA SRS 2.3 Dreadnought Squeezebox Touch Apple TV

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    Quote Originally Posted by zane77 View Post
    ^^Very nice and neat job^^
    Thanks zane
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350

    "So is there any tread left on those tires or is it just like throwing a hotdog down a hallway?"

    www.dhsspeakerservice.com

  12. #12

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    Quote Originally Posted by zane77 View Post
    ^^Very nice and neat job^^
    +1 to what he said.
    SDA 2BTL Sonicaps Mills resistors RDO-198s New gaskets H-nuts Erse inductors Crossover upgrades by westmassguy
    Adcom GTP-450 preamp
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    Pioneer DV-610AV DVD/CD player
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  13. #13

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    Quote Originally Posted by TennMan View Post
    +1 to what he said.
    Thanks Ronnie
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350

    "So is there any tread left on those tires or is it just like throwing a hotdog down a hallway?"

    www.dhsspeakerservice.com

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    Thanks, again, WMG. That looks like the way to go. Are you gluing the magnets directly to the Dynamat? I'm a little apprehensive about doing the magnets for fear of f..ing up the voice coils. Is there need to worry?

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    Quote Originally Posted by drumiv View Post
    Thanks, again, WMG. That looks like the way to go. Are you gluing the magnets directly to the Dynamat? I'm a little apprehensive about doing the magnets for fear of f..ing up the voice coils. Is there need to worry?
    You don't remove them, you just put a bead of glue around the front and back edge of the magnet. They're already glued in place, this is just a precautionary measure. The glue they used back then deteriorates or becomes brittle. This prevents the magnets from shifting.
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350

    "So is there any tread left on those tires or is it just like throwing a hotdog down a hallway?"

    www.dhsspeakerservice.com

  16. #16

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    Gotcha, I was hoping that was the case. Thanks yet again.

  17. #17

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    Just to clarify. I don't think it's necessarry to dynamat the magnets. You dynamate the baskets and you glue the magnets.

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    My understanding about magnet shift is that it is primarily an issue when moving the speakers, which is why the advice I've read here has been to lay the speaker on it's back whenever you're moving it so that the drivers are pointed straight up, in order to stop the magnet from wanting to shift downward during travel. Is this not the case? Is it possible for the magnet to shift on a driver during normal use of the speaker?
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

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    Quote Originally Posted by nspindel View Post
    My understanding about magnet shift is that it is primarily an issue when moving the speakers, which is why the advice I've read here has been to lay the speaker on it's back whenever you're moving it so that the drivers are pointed straight up, in order to stop the magnet from wanting to shift downward during travel. Is this not the case? Is it possible for the magnet to shift on a driver during normal use of the speaker?
    The magnets can shift if the speakers are handled roughly, dropped, fall over, or receive a sharp blow etc.
    Since we all buy them used, god knows how they were handled before.
    Home Theater/2 Channel:
    Front: SDA-2ATL
    Center: Custom Built http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom Built http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat & Hurricane Nuts.
    Pioneer Elite VSX-72TXV, Carver PM-350

    "So is there any tread left on those tires or is it just like throwing a hotdog down a hallway?"

    www.dhsspeakerservice.com

  20. #20

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    The Wedge pack is also at Amazon, that's what I bought as well. Did a pair of 1C's and my 4.1's with that pack, with some left over.

    http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  21. #21

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    I suggest since you're going down this route that you also consider dynamatting other components in your rig as well. I highly doubt that the drivers will have nearly the impact as your source/pre/amp will.
    Usher CP-6311, Shuguang S200MK, Shuguang S845MK, Pioneer BDP-51fd, Douglas IC's, AQ cv-8 SC's, Pangea/Douglas PC's, Epson 8100

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    Default dynamat extreme

    I got my sheet and some scraps from an auto audio installation shop for free.They had just done a car trunk and had all pictured just laying around .I did pay for the squares but returned them because I had way more than I needed. Also shown was a later C/L purchase of Black Hole-5 of a square and scraps all for $18 and enough for the backs of my 2Bs

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    What's "Black Hole-5", and what's it used for?

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    Quote Originally Posted by drumiv View Post
    What's "Black Hole-5", and what's it used for?
    Black Hole 5 is an acoustic foam that enhances the properties of the polyfill stuffing in your speakers. It partially absorbs mid and low frequencies inside the cabinets so they don't reflect to the back side of the MW's interfering with movement of the cone.

    When the stuff is applied properly (not to much, not too little) it cleans up congestion in the mid range, allowing the speakers to sound clearer no matter what volume you play them at.

    Do a search - there are several posts about it including how to install it.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills, polyswitches removed, Lg Solen inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR binding posts, upgraded IC Cable, Black Hole Damping Sheets (3" strips) installed on back wall behind MW's & Tweeters, interior of cabinets sealed, AI-1 interface with 1000VA transformer

  25. #25

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    http://www.polkaudio.com/forums/show...-Modifications

    This thread should explain all the mod's, good luck with some very fun projects
    Home Theater
    Onkyo PR-SC5508 Sharp LC-70LE847U
    Emotiva XPA-5 Emotiva XPA-2 Emotiva UPA-2
    Front RTi-A9 Wide RTi-A7 Center CSi-A6 Surround FXi-A6 Rear RTi-A3 Sub 2x PSW505
    Sony BDP-S790 Dishnetwork Hopper/Joey Logitech Harmony One Apple TV
    Two Channel
    Oppo 105D BAT VK-500 w/BatPack SDA SRS 2.3 Dreadnought Squeezebox Touch Apple TV

  26. #26

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    Drumiv, I to was so new to the SDA line that I had 0 idea what these guys were talking about . D/L THE SDA Handbook .It gives all the liniage of the product, pictures of every speaker set and their nominclachure since they do not use names and all the techincal facts, parts lists and reasoning and the science of the design.Me,w/ my distorted logic never thought a pristine pair of originally $12/$1,300 speakers could get better but trust me it does and I still don't know what I'm talking about but the evidence is in hearing the things.

  27. #27

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    You can also use Sonic Barrier. I used it with my 4.1TL's and like it a lot.
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

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