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Discussion Starter · #1 ·
I have a pair of subs JBL GTI 12 in the basement collecting dust. My plan is to use them to complete the home theater setup, if they are good for this purpose . Hope someone can help me on the box and the frequency tuning, I try winisd but I am new to the program, so I don't know if the info I am coming up with is correct. Also I need to decide which amp is better for a 3.2 (bridge) or/and 6.4 ohm load, my current options are a Crown XTI 2000 or a Behringer 2000 but any suggestion are welcome.

Thanks…
 

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Discussion Starter · #3 ·
The parameters are already in winisd.

Qts: 0.510
Vas: 44.23 l
Fs: 31.83 Hz
Re: 3.2 ohm
Le: 0.75 mH
Xmaz: 20.3 mm
Z: 4.0 ohm
Qms: 6.680
Qes: 0.552
SPL: 86.16 db
Pe: 700 W
BL: 14.64000
Dd: 24.72 cm
Sd: 480.0 cm2
 

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Discussion Starter · #5 ·
Mike, thanks for your quick reply and sorry about the model of the subs. Can you send me the winisd file? I can't get the same results as you.
 

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Discussion Starter · #7 ·
Mike, I wonder if we can go with a lower tune frequency, let’s say 16 Hz, with a bigger box and vent. I want to take the advantages of an LLT configuration. My primary use is for movies. I'm not an expert on these matters so I don't know if this subs a suitable for this kind of configuration. Thanks in advance.
 

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7 cu.ft tuned to 16 hz (each) would be as far as these can go. 600 watts input with a hi pass filter at 15 hz would protect the sub. Porting would be a 6" diameter round port 38" long to keep the port air speed under 24 m/s at 15 hz. How big is your HT room? Is it sealed from other areas or open to them?

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Those W12GTI's are awesome subs. I've always wanted to try one myself. Hopefully that differential drive motor design doesn't get swept under the marketing rug.
 

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Discussion Starter · #12 ·
I'm going to build the box tuned to 21 hz. Here is a draft, any comments or suggestions are welcome.

Thanks Mike for your help.

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Discussion Starter · #16 ·
This is it, I’m starting the build this weekend.

I change the frequency from 21 to 20 hz. The new specifications are as follow:
130 liters (160 liters total with port and braces)
1 rectangle vent of 26 x 7 x 93.58 cm
1st port resonance 183.63 Hz
Port Air velocity 22 m/s

Any comments or suggestions are welcome.

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I remember eyeing those JBL GTi's with envy, years back. I'm curious to see the end result.
 

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Discussion Starter · #18 ·
Since the pictures of the other builds help me to improve my design I will post some pictures of my progress.

I will finish the vent tomorrow and starts the final assemble.

The box is huge and it weight like 150 pounds (ask my back).:yikes:
Workbench Wood Furniture Table Desk

Workbench Tool Mortiser Machine Milling

Wood Plywood Hardwood Table Wood stain

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Wood Plywood Table Architecture Metal

Subwoofer Car subwoofer Loudspeaker Audio equipment Tire

Technology Audio equipment Tire Automotive tire Electronic device
 

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Discussion Starter · #19 ·
Finally the subs are finish. I did some testing today and these things are going to blow my house.:hsd: One of the first test movies was Transformers 2 and at the beginning when the stars appear I have to jump for the remote to turn the volume down.

This week I will take some REW measurements and share it with you guys.

Wood Table Plywood Wood stain Furniture

Wood Wood stain Plywood Hardwood Circle

Wood Plywood Hardwood Furniture Table

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