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Multi-Way Conventional loudspeakers with crossovers

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Old 20th January 2009, 04:17 AM   #11
fwater is offline fwater  United States
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Alright, there will be a bit of work involved whipping something up. Post the width of the baffle you're going for, and give me 24 hours.

Pleased to be of help in the same selfless way it was given to me here long ago (and still is).
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Old 20th January 2009, 04:19 AM   #12
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Quote:
Originally posted by fwater
Alright, there will be a bit of work involved whipping something up. Post the width of the baffle you're going for, and give me 24 hours.

Pleased to be of help in the same selfless way it was given to me here long ago (and still is).

fwater you're a gentleman and a scholar and there aren't many of us left 22cm is the number.
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Old 20th January 2009, 04:32 AM   #13
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What are the common numeric values for stuffing density and speed of sound in stuffing??
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Old 20th January 2009, 04:42 AM   #14
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Ignore speed of sound; these days it is considered irrelevant, damping is to absorb HF, volume and length are important factors.
I just used up all of my knowledge on TL's so I hope some-one else can assist further.
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Old 20th January 2009, 05:13 AM   #15
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Quote:
Originally posted by raypalmer
Fair enough... Where are the tables?
http://www.quarter-wave.com/TLs/TL_Theory.html

1st article in the unnumbered section...

the whole site is worth a read, as is the t-linespeakers site URL below.

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Old 20th January 2009, 05:28 AM   #16
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My (defunct apparently) TL seems like a fail. Any thoughts on this design? WinISD seems to think it will work.

EDIT: I put some time into this design a while ago. But I became muddled about whether this Isobaric-ish ported speaker would really work. Obviously there will be 10-15cm standoffs from the ground for the floor-facing driver. I know neat makes something like this but their's is strictly isobaric to my understanding.
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Old 20th January 2009, 05:34 AM   #17
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WinISD doesn't take into account the tall aspect ratio which causes a TL effect -- if the port was at the bottom you would have mass-loaed TL (althou not nescessarily be tuned properly)

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Old 20th January 2009, 05:35 AM   #18
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I thought the phase-inverted driver in the base would alleviate that?
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Old 20th January 2009, 05:59 AM   #19
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Quote:
Originally posted by raypalmer
I thought the phase-inverted driver in the base would alleviate that?

Didn't even see that... if the phasre is inverted you'll just get (mostly) no bass.

Just be patient ans see what fwater comes back with...

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Old 21st January 2009, 04:25 AM   #20
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Quote:
Originally posted by raypalmer
My (defunct apparently) TL seems like a fail. Any thoughts on this design? WinISD seems to think it will work.

EDIT: I put some time into this design a while ago. But I became muddled about whether this Isobaric-ish ported speaker would really work. Obviously there will be 10-15cm standoffs from the ground for the floor-facing driver. I know neat makes something like this but their's is strictly isobaric to my understanding.
Don't give up on the TL. I modelled what you had (which looked like a 10 litre box with a 36cm long port of 5x20cm dimensions. It had a big peak at 115Hz. But you may be able to do much better in almost the same sized box with a TL. I agree with p10, wait for fwater to do the 'shining knight' thing.

The other design isn't Isobaric (as far as I can see), it's just a dual woofer bass reflex. Isobaric is the type of mounting shown in my primitive attached drawing. For the box you have designed, you would probably need a 100 litre enclosure (and maybe a different sized port). Currently it would have a small peak at 110Hz and be "rolling off" (amplitude would be reducing by) at about 12dB/octave. And, you would probably need a bigger port to handle anything over 5W of input power.

Again, don't give up!
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