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RobWells 1st May 2008 10:10 PM

Possibly Cheap home theater subs! UK
Just bought a pair of JBL GT4-12 drivers off Ebay for my commuter car. Whilst modelling I noticed that the driver models really nicely in an EBS type enclosure for home theater.

I modelled 2 drivers in a 200L enclosure ported to ~18Hz.

They're so cheap you could stick 8 drivers in 4 boxes around the room and get some pretty awesome bass.

Just an idea as there aren't many drivers available in the UK..


Dr_EM 2nd May 2008 12:51 PM

2 Attachment(s)
Good call. A freind wants a new car sub, something which goes deep. A pair loaded iso-barik into a ported box looks like a good balance of extension, volume and size.

GM 2nd May 2008 02:37 PM

Looks good in a TH also assuming the published specs are reasonably close.......


sreten 2nd May 2008 02:57 PM

2 Attachment(s)

The GT4-10 also has good parameters and excursion for smaller boxes :

12mm Linear one-way X-max and dual 40oz(80oz)magnets make this subwoofer a great choice for high output applications.

Progressive spider provides better control at excursion limits than more commonly used linear spiders.

Sensitivity 90dB
Impedance 4 Ohms
Voice-Coil Diameter 50mm
Cut-Out Diameter 232mm
Mounting Depth 150mm
Overall Diameter 258mm
Vas 40.14 liter
Qts 0.42
Fs 29.6Hz
Qes 0.45
Qms 6.45


AndrewT 2nd May 2008 03:09 PM

there's that same recommendation again.
find the maximal flat response box size and detune by approx half an octave. 45L, 29Hz or 20Hz.

Thawach 2nd May 2008 03:27 PM

GT4-10 ....LOL....have pics have sub....LOL(brett theory)

sreten i don't know that why u understand english language or not? he told about GT4-12 but u talk about GT4-10.....LOL.i think u and RobWells talk's sure not understand.LOL:D :D

RobWells u can do it. i think that u want to open a concert in your room more than HT...LOL good..good guy/:cool:

Thawach 2nd May 2008 03:36 PM

JBL GT4-12 specs

Frequency Response: 28Hz - 450Hz
Sensitivity: 93dB
Impedance: 4 Ohms
Voice-Coil Diameter: 50mm
Cut-Out Diameter: 283mm
Mounting Depth: 161mm
Overall Diameter: 311mm
Vas: 100.45 liter
Qts: 0.43
Fs: 24.75Hz
Qes: 0.46
Qms: 6.46
Sealed Enclosure (vol): 28L
Vented Enclosure (vol): 64L

sreten 2nd May 2008 03:41 PM


THe GT4-10 is also a decent option if you want smaller subs.
Main difference is Vas, the 10" will have boxes ~ half the size of 12".


Thawach 31st May 2008 10:56 PM

hi! super steren

i'm not happy on my mind a long time and cannot come here.
(i will not come here if i have not a fun)

steren. i said that i didnot wrong. that time i only read "al"
but "so" i didnot read =i didnot understand=i didnot wrong. lol

steren i'm not good english lg. i surprise inductor!
why does he good english lg better than me? about this
sometime i wook like to kick him really. steren don't
tell him about this. now i will press the number to Cascais.
please you are waiting a few minutes. 123.... hi inductor
please u don't come to this :D

sreten why do i still have baby habit

thanks guys


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