longdrive03 Posted June 12, 2014 Share Posted June 12, 2014 Jorjen, We call it 3/4" inch (we still don't wear shoes and can't read so well around here!) but it is a 4 x 8' sheet. $56 It also comes in 5 x 5'. About two years ago you couldn't get it and if you found some it was $125 for 4 x 8' sheet. Heavy as crud. works great. I've got some 1.25" 4 x 8' sheets of birchply whichI might use for base which should do the trick. I could add 1/5" mdf on outside if necessary if I wanted to make it really heavy. Probably would veneer it in cherry and use the port mod. Quote Link to comment Share on other sites More sharing options...
muel Posted June 13, 2014 Share Posted June 13, 2014 What does a 1.25" 4 x 8' sheet of birch ply weigh?? That would certainly make a stiff cabinet! Quote Link to comment Share on other sites More sharing options...
muel Posted June 13, 2014 Share Posted June 13, 2014 This would take some work but would be a cool effect and I imagine would make a VERY stiff cabinet! You could make it ANY thickness you want! (Found on the ApplyPly site.) Quote Link to comment Share on other sites More sharing options...
Deang Posted June 13, 2014 Share Posted June 13, 2014 I'm just curious if anyone here has read PWK's comments on what happens when you increase the structural rigidity of his designs. Quote Link to comment Share on other sites More sharing options...
muel Posted June 13, 2014 Share Posted June 13, 2014 Sounds familiar but I don't recall. I would assume, in part, that you would be raising the resonance frequency. Are you saying that would be too much and that it wouldn't have good results? 1 Quote Link to comment Share on other sites More sharing options...
djk Posted June 13, 2014 Share Posted June 13, 2014 http://image.made-in-china.com/2f0j00ZCDQtMPaVikT/Bamboo-Furniture-Plywood.jpg 2 Quote Link to comment Share on other sites More sharing options...
djk Posted June 13, 2014 Share Posted June 13, 2014 Bamboo above, end-grain Balsa here (Klipsch used in some PA models). Quote Link to comment Share on other sites More sharing options...
muel Posted June 13, 2014 Share Posted June 13, 2014 I can't find anything from PWK about changing the structural rigidity. I remember reading something about the box being part of the sound and if you change the box you change the sound... don't recall if that was PWK writing that, however. Quote Link to comment Share on other sites More sharing options...
Schu Posted June 13, 2014 Share Posted June 13, 2014 deans alluded to this before... and we are understandably very curious. Quote Link to comment Share on other sites More sharing options...
Marvel Posted June 13, 2014 Share Posted June 13, 2014 I know it was mentioned in an old article I have on horn speakers, with regard to a Frazier Dixielander. The cabinets are rather small, and constructed of 1/2 or 5/8 plywood. The article said the cabinets would resonate, and speculated on how it changed the sound. 1 Quote Link to comment Share on other sites More sharing options...
Schu Posted June 13, 2014 Share Posted June 13, 2014 I am sure all cabinets resonate to some extent... so changing the designed resonate frequency set fourth by the factory by stiffening the cabinets makes them resonate at a non complementary frequency? Quote Link to comment Share on other sites More sharing options...
moray james Posted June 13, 2014 Share Posted June 13, 2014 I can't find anything from PWK about changing the structural rigidity. I remember reading something about the box being part of the sound and if you change the box you change the sound... don't recall if that was PWK writing that, however. box panel motion resonance and that is distortion. eliminate the resonance eliminate the distortion. so yes you will be changing the sound. best regards Moray James. Quote Link to comment Share on other sites More sharing options...
moray james Posted June 13, 2014 Share Posted June 13, 2014 I am sure all cabinets resonate to some extent... so changing the designed resonate frequency set fourth by the factory by stiffening the cabinets makes them resonate at a non complementary frequency? that's a very odd idea you have there. all resonance is unwanted and to remove as much resonance form a cabinet structure as you can is a good thing. manufacturers can only spend so much money building a cabinet so they strike the best compromise they can with available funds. the general goal is to push cabinet resonances up higher than the bandpass of the driver that way the driver cannot excite the cabinets structural resonance. best regards moray james. Quote Link to comment Share on other sites More sharing options...
Schu Posted June 13, 2014 Share Posted June 13, 2014 (edited) TY so then... what is understood to be the issue with stiffening the cabinets? are we talking merely a Timbre change? Edited June 13, 2014 by Schu Quote Link to comment Share on other sites More sharing options...
cradeldorf Posted June 13, 2014 Share Posted June 13, 2014 More of a moving up the resonant frequency of the cab, the higher it is, the less noticible it is. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.