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deep output from very small drivers and enclosure?
deep output from very small drivers and enclosure?
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Old 7th February 2019, 10:29 AM   #31
Nenola is offline Nenola  Finland
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12 liters in kinda small, but the TB 6,5" subwoofer + passive radiators will work in 10 liter enclosure with good results. I pushed the low end with miniDSP and sounds quite good.

The 5" from TB might be the smallest I could imagine as a subwoofer. When going smaller you need to have some gimmicks to get the low notes. In those bt speakers DSP and psychoacoustics are the secret ingredient.
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Old 7th February 2019, 04:02 PM   #32
GM is offline GM  United States
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Quote:
Originally Posted by botnet View Post
am I understanding correctly that both front and rear horns must be at least 14ft to get some 20hz gain?
Actually, to get gain down to 20 Hz you have to design to ~16.2 Hz, ~14 ft only gets you ~ -3 dB/20 Hz. If you look at the TH I simmed, its path-length is tuned a 1/2 octave below 20 Hz to get full gain.

GM
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Old 8th February 2019, 02:34 AM   #33
botnet is offline botnet  India
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Quote:
Originally Posted by GM View Post
Actually, to get gain down to 20 Hz you have to design to ~16.2 Hz, ~14 ft only gets you ~ -3 dB/20 Hz. If you look at the TH I simmed, its path-length is tuned a 1/2 octave below 20 Hz to get full gain.

GM
@GM thanks for the simulation, iím trying to interpret the text file - which parameter is horn length? or is the intent to plug the values into hornresp to understand the dimensions?
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Old 8th February 2019, 04:08 AM   #34
GM is offline GM  United States
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??? Save it to HR's IMPORT FILE, then in HR/File/Import hornresp record/find the file and double click to open it in a new record to view/save/change/whatever.

GM
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Old 8th February 2019, 02:23 PM   #35
academia50 is offline academia50  Argentina
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Originally Posted by Windforce85 View Post
.........Volume of displaced air is equal to membrane area times its excursion. It is simply not possible to do for small driver............
Well, everything depends on the size and type of the enclosure ..
Another question is whether it is practical, but I think you can achieve important SPL with small speakers ....


PassDiy
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Old 8th February 2019, 03:32 PM   #36
DPH is online now DPH  United States
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An interesting point of utility for these pico-size subwoofer drivers is as the 2nd or 3rd sub in a Geddes style arrangement. You don't need prodigious output, but unobtrusive packaging.
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Old 8th February 2019, 03:43 PM   #37
hitsware is online now hitsware
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I just got a couple of these :
http://www.tb-speaker.com/uploads/fi...0d7350d9af.pdf
Pretty good bang / size
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Old 8th February 2019, 05:06 PM   #38
GM is offline GM  United States
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Hey Mike, long time no 'see'!

Interesting, wasn't aware of such modular speakers being available to the general public, thanks!

GM
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Old 8th February 2019, 06:03 PM   #39
hitsware is online now hitsware
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Thank You !

I just ran upon those . Quite a selection .
Sound Module - TB SPEAKER CO., LTD.
They all use passive radiators.
The neat (to me) ones appear to be just
a short tube, driver on one end and passive
on the other.
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Old 18th February 2019, 02:14 AM   #40
hitsware is online now hitsware
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Default what the world needs ...............

Tang Band T1-1828SD Speaker Module 2-5/16" x 2-5/16"

using that as a model
then upsizing to 4" pvc pipe dimensions
for the ' cab '
probably a coupler

use these :
Dayton Audio DMA Series by Dayton Audio
@ each end of pipe
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