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subs 2nd April 2010 09:38 PM

Isobaric HELP
hi there i have a pair of JBL 804 8" woofers i would like to put in a isobaric enclosure, Ive been told that a duel reflex bandpass would work in the space available L 14" H12.5" W10" maybe it would but i need to no air space for both chambers, port size & length if the enclosure isn't to small, if need be i could increase withe a bit more.
thanks subs

odysseybmx414 3rd April 2010 12:09 AM

Hi. Do you have the TS parameters for this driver?

subs 3rd April 2010 03:12 AM


Originally Posted by odysseybmx414 (
Hi. Do you have the TS parameters for this driver?

Hi odysseybmx414 yes i do have it. if you are talking about the THIELE-SMALL PARAMETERS. cant understand a word of it.

chris661 3rd April 2010 08:01 AM

If you post them here, we can design some different cabs for you to choose from.


subs 4th April 2010 03:03 AM

Thiele-small parameters.
ok chris661 here it is

voice coil dc resistance: R evc (ohms) 3.49

voice coil inductance @ 1 khz l evc (mh) 1.64

driver radiating area: sd (in2) 33.17
sd(m2) 214.00

motor force factor: bl (tm) 12.88

compliance volume: v as (ft3) 0.58
v as (liters) 16.42

suspension compliance: c ms (um/N) 251.00

moving mass, air load: m ms (grams) 115.00

moving mass, diaphragm: m md (grams) 113.20

free-air resonance: fs (hz) 29.60

mechanical Q Qms 6.37

electrical Q Qes 0.450

total Q Qts 0.42

magnetic-gap height: hag (in) 3/8
hag (mm) 9.00

voice-coil height: h vc (in) 1-1/4
h vc (mm) 32

maximum excurtion: x max (in) 7/16
x max (mm) 11.50


diameter: 8" (203mm)
sensitivity (2.83 v@ 1m): 91 db
power handling: 200 w rms 800 w peak
frequency response: 30~400 hz
nominal impedance: 4 ohms
voice-coil diameter: 2.0" (51.0 mm)

mounting depth 4-5/16" (110 mm)

i hope this helps you to configure me a isobaric box.

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