rambronco Posted November 27, 2014 Report Share Posted November 27, 2014 I know its been gone over and over, that there are 2 real choices for sub boxes (Mdf & birch Plywood) my question is why? if enough bracing were added to say regular plywood that the 3 boxes (mdf, birch, & standard plywood) had the same amount of flex would they still sound different? If the answer is yes, why? Different density? If an interior coating was put on (say bedliner as an example) the standard plywood wood it remedy this? would it change the sound of the MDF and Birch also? Thanks RB 01 Chevy Silverado X-cab 2 Sundown Z18v4 walled on 2 Lanzar Opti 7k's strapped at 1/2ohm = each amp wired to 1/4ohm. Havent checked impedence rise so not sure what they are actually seeing. 6 group 31AGM's. 2-Eclipse 34230's each one running 2 Eminence 6.5" Beta 6A. These are beastly mids rated at 350w program power. I was skeptical but the eclipse amps are 370w x 2 and when there was 4 mids on 1 amp I could push it into thermal protect within a song so added the 2nd amp. Eclipse 4212 running 4 CT sounds Meso tweeters. and 2 DLS ultimate tweeters up high to raise the soundstage. 96' Ford F350 4wd 4d long bed 7.3 diesel with 91k miles. Will be the sound quality rig if I can ever find the time. Link to comment Share on other sites More sharing options...
Krakin Posted November 27, 2014 Report Share Posted November 27, 2014 Resonances of MDF are almost none existent. This is getting into acoustics I don't know, but I believe it is along the same line as trying to find the right wood for violins and other instruments. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
ToNasty Posted November 27, 2014 Report Share Posted November 27, 2014 I always had better results with a birch or pine plywood but mdf is cheaper than those. ***Super Sellers List***http://www.stevemeadedesigns.com/board/topic/25829-super-sellers-buyers Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 27, 2014 Report Share Posted November 27, 2014 Properly braced I bet there is no audible difference between the materials you listed. I think the reason you see MDF and birch ply used so much is they hit a really nice spot in the price/performance spectrum. The issue with cheaper plywoods is usually the surfaces are rougher and can have splits and gaps that make getting an air-tight box more difficult, let alone getting a decent finish. Also cheaper ply often has voids, which can be a giant pain in the ass too. I've buillt boxes out of OSB, which is actually stiffer than MDF of the same thickness, its just not very pretty. Properly braced it got the job done quite well. These days I like to use Araucoply which is a pine-based plywood. It has been working very well for me. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted November 27, 2014 Report Share Posted November 27, 2014 Properly braced I bet there is no audible difference between the materials you listed. I think the reason you see MDF and birch ply used so much is they hit a really nice spot in the price/performance spectrum. The issue with cheaper plywoods is usually the surfaces are rougher and can have splits and gaps that make getting an air-tight box more difficult, let alone getting a decent finish. Also cheaper ply often has voids, which can be a giant pain in the ass too. I've buillt boxes out of OSB, which is actually stiffer than MDF of the same thickness, its just not very pretty. Properly braced it got the job done quite well. These days I like to use Araucoply which is a pine-based plywood. It has been working very well for me. I'm interested in some pictures if you've got any Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 27, 2014 Report Share Posted November 27, 2014 I'm interested in some pictures if you've got any Sure thing, I got lots of pictures, what exactly do you want to see? "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted November 27, 2014 Report Share Posted November 27, 2014 I'm interested in some pictures if you've got anySure thing, I got lots of pictures, what exactly do you want to see? Build pics of some of your boxes out of osb Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 27, 2014 Report Share Posted November 27, 2014 Here are two subs I built out of OSB, they are both tapped horns. I only was able to find this picture of this sub, I used 3/4" osb. Due to the nature of the design it is very well braced internally and is very stiff. I tried to make the OSB look decent after I was all done: This sub is for two 8" drivers and is what I use in my shop. I used 7/16" OSB because I had a couple sheets laying around and wanted to see if I could make it work. It is also braced pretty well internally: "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
SIDE SHOW Posted November 28, 2014 Report Share Posted November 28, 2014 higher the woods density the better ay? Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 28, 2014 Report Share Posted November 28, 2014 higher the woods density the better ay? Not really, density doesn't do much for you, stiffness is what we are after. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
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