Closed Thread
Page 2 of 3 FirstFirst 1 2 3 LastLast
Results 16 to 30 of 36

Reload Thread: epoxy resin vs polyester resin sealing inside subwoofer box

  1. #16
    mlstrass's Avatar
    mlstrass is offline Shaggy DOA



    Join Date
    Jul 2006
    Location
    Illinois
    Posts
    10,539
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1169 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by ciaonzo View Post
    There is a huge gain in strength when you turn anything into a monocoque-like structure.

    Also, have you ever tried breathing very fast or hard through certain fabrics or whatever and had a tough time, but when you breath easy and slow through it there's no problem? That's the concept behind aperiodic membranes, they become more resistive to higher velocities. MDF is porous, period. There are losses built into modeling programs that acknowledge facts like these.
    So is a ported box breathing slow or fast? And it has a huge hole it anyway, so I highly doubt it makes a diff...

    As for strength, I've yet to have a box come apart, birch or MDF and I don't do any of that **** to them. My last wall had single layer panels in several places and had no problem doing a 60+...







  2. #17
    akadj's Avatar
    akadj is offline Senior VIP Member

    Threadstarter


    Join Date
    Apr 2004
    Location
    Edmonton Alberta CANADA
    Age
    36
    Posts
    436
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    157 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by mlstrass View Post
    So is a ported box breathing slow or fast? And it has a huge hole it anyway, so I highly doubt it makes a diff...

    As for strength, I've yet to have a box come apart, birch or MDF and I don't do any of that **** to them. My last wall had single layer panels in several places and had no problem doing a 60+...
    but as for the density of wood compared to steel, glass, granite. ect.. wood alone will absorb more of the sound wave then heavy or more dense material. .


    Approximate weights per cubic foot:

    mdf - 48lbs
    epoxy resin - 130lbs
    concrete - 150lbs
    glass - 162lbs
    steel - 489 lbs

    see where I'm going with this?
    Last edited by akadj; 02-07-2013 at 08:10 AM.




  3. #18
    akadj's Avatar
    akadj is offline Senior VIP Member

    Threadstarter


    Join Date
    Apr 2004
    Location
    Edmonton Alberta CANADA
    Age
    36
    Posts
    436
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    157 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    also note that the Rockwell hardness test of mdf is 3 while resin is 110

    I think the key to this consists of three things.

    1- density
    2- hardness
    3- surface finish




  4. #19
    ciaonzo's Avatar
    ciaonzo is offline TheContinental



    Join Date
    Feb 2009
    Location
    WI
    Age
    39
    Posts
    9,235
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    549 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by mlstrass View Post
    So is a ported box breathing slow or fast? And it has a huge hole it anyway, so I highly doubt it makes a diff...

    As for strength, I've yet to have a box come apart, birch or MDF and I don't do any of that **** to them. My last wall had single layer panels in several places and had no problem doing a 60+...
    I wasn't really talking about how fast the driver forces air in and out of a vent (which is a wide open area, not was I was asking you to picture), I was mainly addressing structural integrity and sealed enclosures to discuss the principal idea here, MDF being porous or not. My guess is if you wanted to get into surface roughness, drag coefficients for the various types, and wind speed as it pertains to laminar air flow, you would still be a off a bit in your thinking.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  5. #20
    AxT4430's Avatar
    AxT4430 is offline CarAudio.com Elite



    Join Date
    Aug 2012
    Location
    Akron, OH
    Age
    25
    Posts
    848
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    470 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by ciaonzo View Post
    I wasn't really talking about how fast the driver forces air in and out of a vent (which is a wide open area, not was I was asking you to picture), I was mainly addressing structural integrity and sealed enclosures to discuss the principal idea here, MDF being porous or not. My guess is if you wanted to get into surface roughness, drag coefficients for the various types, and wind speed as it pertains to laminar air flow, you would still be a off a bit in your thinking.
    what is your degree?? lmao




  6. Thanks ciaonzo thanked for this post
  7. #21
    ciaonzo's Avatar
    ciaonzo is offline TheContinental



    Join Date
    Feb 2009
    Location
    WI
    Age
    39
    Posts
    9,235
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    549 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by AxT4430 View Post
    what is your degree?? lmao
    Ha... I wish.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  8. #22
    akadj's Avatar
    akadj is offline Senior VIP Member

    Threadstarter


    Join Date
    Apr 2004
    Location
    Edmonton Alberta CANADA
    Age
    36
    Posts
    436
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    157 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    now thats going into the direction I was thinking with coefficient and wind speed.. if were adding 45's might as well add glass too

    smooth air flow with a hard reflective surface




  9. #23
    AxT4430's Avatar
    AxT4430 is offline CarAudio.com Elite



    Join Date
    Aug 2012
    Location
    Akron, OH
    Age
    25
    Posts
    848
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    470 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by ciaonzo View Post
    Ha... I wish.
    So, are you a self taught dynamics freak?




  10. #24
    AxT4430's Avatar
    AxT4430 is offline CarAudio.com Elite



    Join Date
    Aug 2012
    Location
    Akron, OH
    Age
    25
    Posts
    848
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    470 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    @ciaonzo ; I just got clarion cz702 get a plane ticket and come tune it! lol




  11. #25
    ciaonzo's Avatar
    ciaonzo is offline TheContinental



    Join Date
    Feb 2009
    Location
    WI
    Age
    39
    Posts
    9,235
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    549 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    lol

    But then you won't learn how to yourself!



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  12. #26
    AxT4430's Avatar
    AxT4430 is offline CarAudio.com Elite



    Join Date
    Aug 2012
    Location
    Akron, OH
    Age
    25
    Posts
    848
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    470 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by ciaonzo View Post
    lol

    But then you won't learn how to yourself!
    ciaonzo seals his epistemic knowledge with ambiguous responses!

    But true.. I need to have a couple nights with diyma.com

    I basically have the concept of cross over points plus slopes.. master that, then T/A .. Then tearing my car apart, and selling some lesser quality audio stuff!




  13. Likes ciaonzo liked this post
  14. #27
    ciaonzo's Avatar
    ciaonzo is offline TheContinental



    Join Date
    Feb 2009
    Location
    WI
    Age
    39
    Posts
    9,235
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    549 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by AxT4430 View Post
    ciaonzo seals his epistemic knowledge with ambiguous responses!

    But true.. I need to have a couple nights with diyma.com

    I basically have the concept of cross over points plus slopes.. master that, then T/A .. Then tearing my car apart, and selling some lesser quality audio stuff!
    Sorry, I hope you don't feel put off. It really is fun tuning and tweaking, you will love it. Even after you get it right you'll keep changing it, lol. They call us tweakers for a reason.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

  15. #28
    AxT4430's Avatar
    AxT4430 is offline CarAudio.com Elite



    Join Date
    Aug 2012
    Location
    Akron, OH
    Age
    25
    Posts
    848
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    470 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by ciaonzo View Post
    Sorry, I hope you don't feel put off. It really is fun tuning and tweaking, you will love it. Even after you get it right you'll keep changing it, lol. They call us tweakers for a reason.
    Im fine haha. I think it will be fun!




  16. #29
    akadj's Avatar
    akadj is offline Senior VIP Member

    Threadstarter


    Join Date
    Apr 2004
    Location
    Edmonton Alberta CANADA
    Age
    36
    Posts
    436
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    157 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    heres a few pictures of glass enclosures and marble enclosures











  17. #30
    ciaonzo's Avatar
    ciaonzo is offline TheContinental



    Join Date
    Feb 2009
    Location
    WI
    Age
    39
    Posts
    9,235
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    549 Post(s)

    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Wow, that's quite an undertaking. I can't imagine the cost involved with all that.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

Closed Thread
Page 2 of 3 FirstFirst 1 2 3 LastLast

Similar Threads

  1. Resin the inside of box?
    By Cali_Screw in forum Enclosure Design & Construction Help
    Replies: 25
    Last Post: 11-10-2008, 10:57 AM
  2. Resin vs. Non-Resin test (spl results inside)
    By PSturmer in forum Enclosure Design & Construction Help
    Replies: 16
    Last Post: 12-10-2007, 09:43 PM
  3. should I use resin inside of box
    By fatboyracing in forum Enclosure Design & Construction Help
    Replies: 10
    Last Post: 10-14-2007, 01:57 AM
  4. ? on sealing inside of box....
    By el rafa in forum Enclosure Design & Construction Help
    Replies: 8
    Last Post: 11-16-2006, 04:48 PM
  5. Epoxy vs. Polyester
    By Cajundude in forum Enclosure Design & Construction Help
    Replies: 5
    Last Post: 07-18-2005, 12:33 PM

User Tag List

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum