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Old 16th December 2004, 10:31 PM   #221
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Quote:
Originally posted by planet10
Something like this? I choose xSection breakdown based on minWidth and added a bit of a base... driver mounted on slantSide to keep minimum height....

dave
Pretty short huh? I like the base. Nice touch! It could be easily folded too.
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Old 16th December 2004, 10:38 PM   #222
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Quote:
Originally posted by Timn8ter
It could be easily folded too.
It would... make a nice compact stand-mounter -- and facilitate a nice bi-pole too

dave
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Old 16th December 2004, 11:12 PM   #223
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Quote:
Originally posted by planet10


It would... make a nice compact stand-mounter -- and facilitate a nice bi-pole too

dave
Exactly what I was thinking. BTW, you nailed that drawing. Just like it came out of head and magically appeared in myriad little dots.
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Old 17th December 2004, 03:08 AM   #224
GM is online now GM  United States
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Quote:
Originally posted by planet10


It would... make a nice compact stand-mounter -- and facilitate a nice bi-pole too

dave
The vent/base design looks awfully familiar. FYI, the 126 with ~5 ohms (whatever gets Qts to ~0.403) looks great in those folded 40-1197 pipes, with 8 ohms yielding ~the same response/BSC compensation.

GM
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Old 17th December 2004, 05:55 AM   #225
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Quote:
Originally posted by GM
The vent/base design looks awfully familiar. FYI, the 126 with ~5 ohms (whatever gets Qts to ~0.403) looks great in those folded 40-1197 pipes, with 8 ohms yielding ~the same response/BSC compensation.
It -- or the BD-pipes i've been living with -- inspired the port & bass. The 3 points are definitly inspired by your design.

A lite version of GMs pipe attached. He has donated the design to the transmission line speakers site with the intention that plans will be distributed on a "by donation" basis... even without having the page up or the details of distribution worked out i've already had one donation of $25 for the plans.

dave
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Old 17th December 2004, 10:33 AM   #226
joensd is offline joensd  Germany
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In the absense of another driver to actively cancel newtonian motion, this scheme ties the driver better to the mass of the cabinet and minimizes it. A more elaborate scheme actually has a tightening mechanism so that you can dial in the amount of pressure on the driver.
Makes perfect sense but kinda odd that its not seen more often then.


Quote:
VectorWorks. May not fit into your budget, but despite some serious horsepower & feature set, is very simple to use for these kinds of drawings.

Once i have the drawing done, i just get the size i want on the screen, use the OS X built-in screen snap and take the resulting pdf into PhotoShop to tweak it and save out as a gif file.
Thought it may be freeware.
Thanks a lot anyway.
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Old 17th December 2004, 02:37 PM   #227
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Makes perfect sense but kinda odd that its not seen more often then.
Well, in the 'good old days', the average driver was made much more robust, with more lossy gaskets and bolted into more rigid cabs with more mounting points than the norm today, so there wasn't as much need for it. Plus, with greater average efficiency, lower excursion due to limited LF BW and much more noise in the signal to mask any driver generated noise....... And of course today it's often a matter of paring parts/assembly costs to the minimum.

Anyway, the better drivers of today don't need it. For instance, as a default note for all my designs, I recommended using the screw adjustment on the various Jordan, Fostex, etc., ones, but AFAIK only two folks did it (JX92S, FX200) and neither found any audible difference, and prosound quality drivers are still sturdily built so only needs to be supported if required to survive the abuse of repeated shipment.

On a 'flimsy' driver or one with a hard paper gasket though, the difference isn't subtle.....

GM
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Old 18th December 2004, 10:53 AM   #228
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thanks GM for your insight!
do you happen to have written a book about these things?

PS.: I always wanted to start a thread about one of your designs which is working great for me but am still tweaking (active-XO) as the woofer is only almost fullrange so I just stuck a TB somehwere into the enclosure.
So thanks once more to you and MJK.
Gradient TL+TB (132kB)
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Old 18th December 2004, 03:00 PM   #229
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You're welcome! No, not much point in it since everything I've learned is in one book or another. Anyway, Earl Geddes has strongly implied that if it's not in his book it's not relevant to speaker design/application, so maybe it's worth the semi-high price.

BTW, you did seal up the back of the TB, making it basically a wide BW sealed back tweeter so that the woofer/pipe action can't modulate it, right?

GM
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Old 18th December 2004, 03:53 PM   #230
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Well, it was a very spontaneous and naive newbie-act when I put in the TB. Took me a while to realize I should best seal it off.
XO is 12dB-LR-active at 340Hz at the moment so the TB would need at least 1,5l (91.5 in^3) to stay linear to that point.
This volume in a relatively thin pipe (324cm^2 or 50in^2) is an interruption in the line and probably worse than some modulation?
Im already thinking about using another fr-driver that only needs 40in^2 so that might be my ticket.
Maybe Ill end up with a much higher XO-point anyway; who knows...

Sorry for OT
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