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JBL CS1214, what to do with it
JBL CS1214, what to do with it
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Old 16th November 2015, 03:45 PM   #1
zdr is offline zdr  Belgium
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Default JBL CS1214, what to do with it

I found a forgotten sub in my basement. I grabbed it as a deal in some car audio shop, and has been collecting dust for years. Since I have a bunch of bookshelf speakers, it would make for a nice low extension. I also found a class D tripath amp that could power it up. Any idea of the sealed box dimensions I should use? Can it be set up to fire down, and try to pass it as a coffee table with the wife

CS1214 - JBL
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Old 16th November 2015, 04:21 PM   #2
GM is offline GM  United States
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Yes, based on its published specs it's well within the 5% rule, so plenty of Fs shift 'wiggle room'. FWIW, mobile audio drivers in general have very stiff suspensions, so that they will work well in small boxes [net Vb], so have no sag problem WRT orientation: http://www.hobbielektronika.hu/forum....php?id=260785

For ~'best' transient response, 0.577 Qtc: ~269 L/~40 Hz F3, ~32 Hz Fb

For ~flattest response, 0.707 Qtc: ~78 L/~40 Hz F3, ~40 Hz Fb

For a bit more 'bottom' bass, 0.9 Qtc: ~33 L/~43 Hz F3, ~52 Hz Fb

Of course any size in-between will be fine and you can to some extent adjust Qt by how much internal damping is used.

GM
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Old 16th November 2015, 04:52 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

For a Qts of 0.54 driver a sealed box 50% to 100% of Vas (77L)
is a good idea. 56L (2cuft) sealed and well stuffed would be fine.

rgds, sreten.
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Old 16th November 2015, 09:10 PM   #4
zdr is offline zdr  Belgium
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JBL specs list 28.32 liter sealed box, just not sure if that includes volume of the driver and other parts inside:

http://www.hobbielektronika.hu/forum....php?id=260785
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Old 16th November 2015, 09:14 PM   #5
Brian Steele is online now Brian Steele  Grenada
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Quote:
Originally Posted by zdr View Post
JBL specs list 28.32 liter sealed box, just not sure if that includes volume of the driver and other parts inside:

http://www.hobbielektronika.hu/forum....php?id=260785
That's for car audio use.
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Old 16th November 2015, 09:27 PM   #6
zdr is offline zdr  Belgium
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Yes, but at 40eur for 12 incher from JBL I am not complaining
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Old 16th November 2015, 11:32 PM   #7
Brian Steele is online now Brian Steele  Grenada
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Quote:
Originally Posted by zdr View Post
Yes, but at 40eur for 12 incher from JBL I am not complaining
I was referring to the suggested 28L sealed box for that driver. That may be fine for car audio use, but if you're planning to use it in a home environment, it's probably not going to work out too well.
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Old 17th November 2015, 10:50 AM   #8
zdr is offline zdr  Belgium
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I'm kinda tight with room space, so I'd like to go with minimum usable volume. What will I lose if I choose 33l as opposed to 56?
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Old 17th November 2015, 11:32 AM   #9
snappyturtle is offline snappyturtle  United States
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Quote:
Originally Posted by zdr View Post
I'm kinda tight with room space, so I'd like to go with minimum usable volume. What will I lose if I choose 33l as opposed to 56?
about half an octave of low end.
GM posted some box sizes above with Fb and F3s, which gives a rough idea of performance. 28L for the driver in a moderate sized room will likely leave you underwhelmed. sreten's suggestion of 56l is a nice happy medium and can be made into a convenient end table type configuration, if masking its appearance is important.

i have the older version of that sub which i played around with quite a bit. (its currently in a folded horn out in the garage) but one of my favorites was a TL coffee table, if i recall correctly it was closer to the 78l size, if not slightly larger.
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Old 18th November 2015, 06:27 AM   #10
zdr is offline zdr  Belgium
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Ok

It seems that THOR will fit the bill:

THOR - subwoofer

Can someone recommend power amp to use for this without breaking the bank? I see a few digital options on ebay, like this one:

TPA3116D2 50WX2 100W 2 1 Channel Digital Subwoofer Amplifier Board 12V 24V Power | eBay
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