Closed Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 25

Reload Thread: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

  1. #1
    SpeedEuphoria's Avatar
    SpeedEuphoria is offline CarAudio.com Elite



    Join Date
    Jun 2010
    Location
    BCM
    Posts
    575
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    Basically what the title says. The only thing I found similar is this page where it compares 1/2" sheets and says ~20-40lbs difference which is a huge variance.

    Also any tricks to using this for a box?

    how about staining it, any recommended finishes?

    Pics of Birch boxes would be nice also, post em up



    03 Dodge Stratus Coupe SXT
    89 Dodge Spirit 10's or Bust!!
    http://www.cardomain.com/ride/2641801




  2. #2
    VWBobby's Avatar
    VWBobby is offline PG and SS nuthugger



    Join Date
    Jul 2010
    Location
    Nibiru
    Age
    32
    Posts
    1,315
    Post Thanks / Like
    Mentioned
    1 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    It depends on the manufacture of the material. Some wood is very crappy quality (MDF) that crumbles, has pieces of metal that spark off when cutting, etc. It might be heavier or lighter than another manufacture's material.

    What you're looking for is BALTIC Birch..... Regular birch plywood like you find at Home Depot is not the same thing. It is a birch veneer over regular plywood. Be prepared to spend about double $$ to build it out of BB verses MDF, but the rewards in weight and SQ is worth it imho.




  3. #3
    oldschoolboomer's Avatar
    oldschoolboomer is offline Premium Member oldschoolboomer is a Supporting Member of the forum!



    Join Date
    Jul 2007
    Location
    white house, TN
    Posts
    2,037
    Post Thanks / Like
    Images
    3
    Mentioned
    2 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    average weight of 4x8 3/4 plywood is @70 lbs.
    average weight of 4x8(ish) 3/4 mdf is @96 lbs.



    2012 Passat 3.6se - Factory Nav Unit, Audiocontrol Lc7i, Hertz HSK 165, (2) RF T1 12's sealed, RF T1500bd, RF T400-2, (2) Optima D31's

    1988 Bronco - (1) cda117, (4) RF pps4-6, (2) RF pp4-t, (2) Crescendo S550/2, (2) Crescendo BC3500's Strapped, (4) Soundqubed sdc2.5-15's in @13 net cubes tuned to 35 Hz, (2) Kinetik HC2400pro, (1) 70 AH under hood, (1) 240 amp alternator

    refs: hundreds

  4. #4
    oldschoolboomer's Avatar
    oldschoolboomer is offline Premium Member oldschoolboomer is a Supporting Member of the forum!



    Join Date
    Jul 2007
    Location
    white house, TN
    Posts
    2,037
    Post Thanks / Like
    Images
    3
    Mentioned
    2 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    and the mdf enclosure will probably sound slightly better IMO as it has a much higher internal loss.



    2012 Passat 3.6se - Factory Nav Unit, Audiocontrol Lc7i, Hertz HSK 165, (2) RF T1 12's sealed, RF T1500bd, RF T400-2, (2) Optima D31's

    1988 Bronco - (1) cda117, (4) RF pps4-6, (2) RF pp4-t, (2) Crescendo S550/2, (2) Crescendo BC3500's Strapped, (4) Soundqubed sdc2.5-15's in @13 net cubes tuned to 35 Hz, (2) Kinetik HC2400pro, (1) 70 AH under hood, (1) 240 amp alternator

    refs: hundreds

  5. #5
    VWBobby's Avatar
    VWBobby is offline PG and SS nuthugger



    Join Date
    Jul 2010
    Location
    Nibiru
    Age
    32
    Posts
    1,315
    Post Thanks / Like
    Mentioned
    1 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    All things being equal, the BB is structurally stiffer than MDF. If you were to double-baffle the MDF it would be more rigid than the BB possibly. I'd rather dampen the box with batting or other material and run BB if you're worried about internal resonance. That being said, I just built a MDF box for myself and it is Extremely heavy with only a double baffle, 3/4" MDF!




  6. #6
    spltuscon's Avatar
    spltuscon is offline Kick-*** box builder



    Join Date
    Jun 2009
    Location
    NH
    Posts
    818
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    I don't know the exact weight difference but it's definitely considerable. Here's a couple of pics of a plywood box I built for myself:






    It's for a pair of older Orion H2 tens. I got a little carried away and did 3 coats of Minwax Gloss poly inside and outside. Looks absolutely beautiful in person though and sounds great too.



    Dave The Box Guy


    154.4 db USACi Stock 601-1800- NH S.R. 2009
    152.4 db legal in WCP1 TNESPL 2010
    150.9 db legal in Stock 1 NESPL 2010
    150.5 Street C Db Drag 2010

    2010 Woofer Cooker Pro 1 champ
    2009 NESPL Competitor of the Year

  7. #7
    MONSONwarrior's Avatar
    MONSONwarrior is offline Constantly Rebuilding... MONSONwarrior is a Supporting Member of the forum!



    Join Date
    May 2010
    Location
    Baton Rouge, LA
    Posts
    1,707
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    that's one big *** dowel..



    2002 Chevrolet Trailblazer LT
    Pioneer AVIC-U310BT | Eclipse SC6500 | MB Quart Q4.80
    (2) Fi BTL N2 12 in 4.5 cubes @ 33hz | Cactus K5 | XS D3100 & D3400 | Knu 0 Gauge | Big 3 | 250a Alt


  8. #8
    spltuscon's Avatar
    spltuscon is offline Kick-*** box builder



    Join Date
    Jun 2009
    Location
    NH
    Posts
    818
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    Yeah that's a 2" one...I wasn't messing around...lol



    Dave The Box Guy


    154.4 db USACi Stock 601-1800- NH S.R. 2009
    152.4 db legal in WCP1 TNESPL 2010
    150.9 db legal in Stock 1 NESPL 2010
    150.5 Street C Db Drag 2010

    2010 Woofer Cooker Pro 1 champ
    2009 NESPL Competitor of the Year

  9. #9
    sundownz's Avatar
    sundownz is offline Supporting Vendor sundownz is a Supporting Member of the forum!

    sundownz is a Supporting Vendor of the forum!

    Join Date
    Aug 2003
    Location
    North Carolina
    Posts
    10,996
    Post Thanks / Like
    Mentioned
    92 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    I like to use the Aruco Ply from Lowes -- as it is stronger than their "birch" (laminate) plywood. Only the actual baltic birch is stiffer and it's hard to find. The Aruco ply is VERY light.



    - Jacob Fuller
    - Owner, Sundown Audio
    - Associate, Stereo Integrity

    - I DO NOT USE PMs ON HERE -- Please e-mail me!
    - E-MAIL is sundownz@sundownaudio.com
    Simon Eichenberger is THE MAN.

  10. Thanks Vettefiend thanked for this post
  11. #10
    CHEMMINS's Avatar
    CHEMMINS is offline CarAudio.com Veteran



    Join Date
    Aug 2010
    Location
    Nevernever Land
    Posts
    4,081
    Post Thanks / Like
    Mentioned
    5 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    A true baltic birch usually comes in a 5' x 5' sheet. And that sheet 1" thick is about $95 for me.



    References:
    kmarei, ge_off_me, AudioPipe, slim2fattycake, Louisiana_CRX, ARMed&Bangin, EXTREMECHEVYMAN, Dpc69ss, Psychoacoustics, Shinju, jonny101abc, snoopdan

    BUYING SILVER TOP TRF MOTORS



  12. #11
    SpeedEuphoria's Avatar
    SpeedEuphoria is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jun 2010
    Location
    BCM
    Posts
    575
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    Quote Originally Posted by sundownz View Post
    I like to use the Aruco Ply from Lowes -- as it is stronger than their "birch" (laminate) plywood. Only the actual baltic birch is stiffer and it's hard to find. The Aruco ply is VERY light.
    Any more info on this stuff, like cost? Sold in a 4x8 sheet I presume.

    Edit I called Lowes and they had know Idea what I was talking about. Its just Composite plywood right?

    Sel-x composite is what they had as a radiated plywood they can special order it and get a sheet for $35 in a couple days to a week.



    03 Dodge Stratus Coupe SXT
    89 Dodge Spirit 10's or Bust!!
    http://www.cardomain.com/ride/2641801

  13. #12
    spltuscon's Avatar
    spltuscon is offline Kick-*** box builder



    Join Date
    Jun 2009
    Location
    NH
    Posts
    818
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    I believe what I used was the Aruco ply also, it's really a nice quality and better than the birch ply they sell at Lowes. The laminate is so thin that if you sand even a little bit you go right through it and ruin the nice look.



    Dave The Box Guy


    154.4 db USACi Stock 601-1800- NH S.R. 2009
    152.4 db legal in WCP1 TNESPL 2010
    150.9 db legal in Stock 1 NESPL 2010
    150.5 Street C Db Drag 2010

    2010 Woofer Cooker Pro 1 champ
    2009 NESPL Competitor of the Year

  14. #13
    VWBobby's Avatar
    VWBobby is offline PG and SS nuthugger



    Join Date
    Jul 2010
    Location
    Nibiru
    Age
    32
    Posts
    1,315
    Post Thanks / Like
    Mentioned
    1 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    spltuscon, Awesome looking box man. You did a really nice job building it, very rigid.

    I've never heard of the Aruco ply.....I'll have to try some out next time I build a box. Its hard to get BB in my area, special order only.




  15. #14
    Louisiana_CRX's Avatar
    Louisiana_CRX is offline dem shoes......



    Join Date
    Aug 2006
    Location
    Piney Hills of Louisiana
    Posts
    34,152
    Post Thanks / Like
    Images
    9
    Mentioned
    31 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    go Aruco




    Current 2010 Louisiana USACi State Records :

    Trunk 0-1000.................. 151.3
    StreetBeat 2................... 145.6
    Stock 1801-up.................153.8
    SuperStock 1801-up..........154.2
    Top three in 11 out of 26 power classes and Louisiana USACi Points Leader at 465

  16. #15
    Ineed$'s Avatar
    Ineed$ is offline Senior VIP Member



    Join Date
    Apr 2008
    Location
    San Diego
    Age
    27
    Posts
    414
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Anyone know the weight difference between a sheet of 3/4 Birch and 3/4 MDF??

    I think I'm gonna go with the Arauco plywood. It's much lighter than mdf and only ten bucks more a sheet. But should I expect any issues with SQ? I thought the reason for using mdf was because of it's high density.



    Head Unit: Alpine 9887
    Amps: MB Quart DSC4125 & ONX1.1500
    Fronts: Hifonics ZXI6.5cs
    Sub: 12" IDMAX (2.5@32hz)

    refs: Peaks, Spencer321, bernser1er, smiley2186, bikinpunk, massiveaudiocw, loudexpedition, us3

Closed Thread
Page 1 of 2 1 2 LastLast

Posting Permissions

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

1e2 Forum