Replacement woofer for JBL HT1S - diyAudio
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Old 6th November 2014, 04:23 PM   #1
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Default Replacement woofer for JBL HT1S

Hi,

I have a JBL HT1S and the I blew off the woofer. Dont ask me how, I am not too sure. The amp was only 100W RMS. Maybe the frequency was too low (there was no low frequency cut off on the decoder).

I am thinking about buying a new sub, but I already have this huge box, so might as well reuse it.

The spec's from the HT1S owner's manual are as follows:
Low Frequency: 12" High Polymer Laminate
Response: 35 HZ to 80 HZ
Height: 21.5"
Width: 25.25"
Depth: 175/8"
I think this is around 140-150l.
The port seems to be 2.9'' wide.
The cabinet walls are pretty thick. I would say at least 1/2" thick.
There is a lot of foam inside.

My goal would be to find a driver with a smooth response down to 25 HZ if possible. If you could recommend something that would be awesome.

Thanks,
Serge
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Old 8th November 2014, 02:56 AM   #2
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Anyone, any advice?
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Old 8th November 2014, 05:07 PM   #3
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If you have the T/S parameters for the original driver, you could match an aftermarket driver pretty close.

Last edited by Relic1Golf; 8th November 2014 at 05:30 PM.
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Old 8th November 2014, 06:39 PM   #4
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by sergedc View Post
Anyone, any advice?
Hi Serge,



Her is a way to match a tuned(fb) BR Volume by using the Driver Qts,fs and Vas:

PS Always check the Port Volume Velocity, IMO:Rec: < ~15 m/Sec Peak or < 10 m/Sec RMS. The shown Sim. using a 4" Port will not handle an Input Power more than 20 W Rms if using the Lab 12 Driver.

b
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Old 9th November 2014, 02:26 AM   #5
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bjorno, Thanks! I am very keen in learning this.
In the analysis on the right of the page, when it is trying different Qts (0.36, 0.38, 0.4): why is it using fs = 25 instead of 22?

So say: if I use this driver for my box:
Qts = 0.421 => Vb = 150 => ffc = 21.8 & f3 = 22.9
Where does the port come into the calculation?

Is this not saying that I can use any driver, and that the bigger the box the better the result?
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Old 9th November 2014, 08:28 AM   #6
Baldin is offline Baldin  Denmark
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Have 2 JBL HT1S and because I wanted to use another box (under the sofa in my HT) I found the volume to be around 120 l and the tuning around 25 Hz. Use e.g. WINisd to find a match.
Dayton DC300-8 seems to fit the bill quite well .... think it is a fairly good replacement
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Old 9th November 2014, 10:05 AM   #7
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Excellent. Dayton DC300-8 seems like a great fit a great deal. Thanks!
Will just need to wait to go to US to pick it up..... Does not seem to be available in UK or Singapore.

Serge
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Old 9th November 2014, 10:43 AM   #8
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But is this woofer (DC300-8) for subwoofer? It seems to be for a normal speaker?
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Old 10th November 2014, 09:23 PM   #9
Baldin is offline Baldin  Denmark
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only down side as I see is a limited Xmax (4,3 mm) ..... but not sure the original is much better ....
There are better options today; more Xmax, better power handling and low tuning in a much smaller box .... but the old box is old school, big box high sensitivity.

You might be abe to find a better alternative .... use WINisd, just as I did to try ir out ....
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Old 11th November 2014, 12:33 PM   #10
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I bought the Dayton DC300-8. For 41 USD incl. shipping, this is a great deal I feel.

Thanks!
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