Reducing the size of a cabinet = bad idea. You'll loose LF, and increase ripple depending on the driver and it's Vas. If it's too big, then a different cabinet and / or driver might be a better idea.
1/2in? Don't even think about it -you'll suffer from chronic resonance problems. Even 3/4in is marginal with the larger builds. If you can't get more than 1/2in, then you'll need to laminate a couple of pieces together.
1/2in? Don't even think about it -you'll suffer from chronic resonance problems. Even 3/4in is marginal with the larger builds. If you can't get more than 1/2in, then you'll need to laminate a couple of pieces together.
davidallancole said:
The panels that I've seen were either 5/8 or 3/4 inch. Available in pine or aspen. Solid wood - even pine - is quite a bit stiffer than plywood and a LOT stiffer than MDF. Aspen is stiffer than pine and would be my choice. The glued up panels will be more stable than a single board, certainly stable enough for a BIB I would think.
Look for a panel that is glued up from full length pieces without any (or many) short pieces butted together.
-- Dave
I would like to use this stuff because I could then make a tutorial on building a BIB and it would pretty much be go by the planks from Home Depot, cut to length, glue together. Not many tools required other than a bunch of clamps.
I am going to go to Home Depot and Rona tomorrow to get exact widths, lengths, thickness and what not.
What are you guys listening for when you tap on the wood? Should it not ring to long? Should it have a higher frequency sound or lower frequency?
Thanks.
I am going to go to Home Depot and Rona tomorrow to get exact widths, lengths, thickness and what not.
What are you guys listening for when you tap on the wood? Should it not ring to long? Should it have a higher frequency sound or lower frequency?
Thanks.
Wish I could find drivers like that! I'm afraid completely shot for time at the moment -got another paper to prepare & then I'm back down to Cornwall tomorrow until Tuesday, so I can't do anything refined -sorry. However, if you want me to SWAG it, then I'd go with a 138in line, Zdriver of 30in a la TC's original, and Sl=150in^2. Should do the job pretty well.
Hi
GM & Scottmoose.. Do you have a formula so i can recalculate "Zdriver" ?
I tryed recalculating the Line length, 34300cmsek / 47hz / 2 /2,54" = 143.65" this is a little bit taller than the 138" suggested, will this make any difference to the suggested SI (12.43" w x 17.69" d) Or should i just keep the original 138"Line Length/30" Zdriver ?
Best regards Kim Olesen
GM & Scottmoose.. Do you have a formula so i can recalculate "Zdriver" ?
I tryed recalculating the Line length, 34300cmsek / 47hz / 2 /2,54" = 143.65" this is a little bit taller than the 138" suggested, will this make any difference to the suggested SI (12.43" w x 17.69" d) Or should i just keep the original 138"Line Length/30" Zdriver ?
Best regards Kim Olesen
Greets!
A simple formula doesn't take into consideration the terminus' (Sl) end correction, so assuming the WS's SoS = 34,200 cm/sec and 57 Hz Fs, the impedance plot indicates it's the correct length.
That said, if you want to increase the length, then maintain Sl's dims and add 1/2 the difference to 30" to maintain the same driver/floor height.
GM
A simple formula doesn't take into consideration the terminus' (Sl) end correction, so assuming the WS's SoS = 34,200 cm/sec and 57 Hz Fs, the impedance plot indicates it's the correct length.
That said, if you want to increase the length, then maintain Sl's dims and add 1/2 the difference to 30" to maintain the same driver/floor height.
GM
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Hi
Thank you for your support... what frequency should i use for calculating the Line Lenght ? Original datasheet has very limited data on frequency, "min. resonance frequency = 40hz" and "Qo = 0.5 at 40hz", also found some other specification at http://www.spectrumaudio.de/breit/vintage.html that says "Fres 57Hz". I'm a bit confused
Best regards Kim
Thank you for your support... what frequency should i use for calculating the Line Lenght ? Original datasheet has very limited data on frequency, "min. resonance frequency = 40hz" and "Qo = 0.5 at 40hz", also found some other specification at http://www.spectrumaudio.de/breit/vintage.html that says "Fres 57Hz". I'm a bit confused
Best regards Kim
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