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Convert a car subwoofer to home use

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  #1  
Old 12th October 2010, 10:32 PM
 
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Convert a car subwoofer to home use


OK_ the wife wants the JBL CS1204t subwoofer out of the car, and I have no reason to throw it out, or sell it.

So- how do I get to convert it into a AC powered home use SUB.

Specs
JBL - CS1204T

now---- I guess all I need is a sub amplifier of about similar rating that runs on AC power.... takes line out from my amp and I am sone.

Where would I get required parts- like this in Mumbai?

KD
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  #2  
Old 13th October 2010, 10:37 AM
 
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Re: Convert a car subwoofer to home use

This is all you need. subwoofer module (Powered by CubeCart)

Put it in a suitable enclosure and there you go.
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  #3  
Old 13th October 2010, 10:58 AM
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Re: Convert a car subwoofer to home use

Quote:
Originally Posted by Kamlesh D View Post
OK_ the wife wants the JBL CS1204t subwoofer out of the car, and I have no reason to throw it out, or sell it.

So- how do I get to convert it into a AC powered home use SUB.

Specs
JBL - CS1204T

now---- I guess all I need is a sub amplifier of about similar rating that runs on AC power.... takes line out from my amp and I am sone.

Where would I get required parts- like this in Mumbai?

KD
it's a tube, and it's modelled to sound best in a car (taking into account the LF gain in the car), so you may not get the deepest bass when you put it in the room. if that's okay with you.. then you just need a sub amp as described by the 2nd poster.

If feel upto "improving the deep bass" you probably need to get a fix of the T/s parameters and then model a box and alignment to suit it. it's probably the same cs driver that is also available boxless, but you could pm sam kapasi at team-bhp just to be sure. after that, there are plenty of people on the forum who can help you make choices.

also, if you want to keep it simple, just about any old amp that's stable in 4ohms and is capable of more than 60watts continuous should do you.

cheers..
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Old 13th October 2010, 06:14 PM
 
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Re: Convert a car subwoofer to home use

Quote:
Originally Posted by Kamlesh D View Post
OK_ the wife wants the JBL CS1204t subwoofer out of the car, and I have no reason to throw it out, or sell it.

So- how do I get to convert it into a AC powered home use SUB.

Specs
JBL - CS1204T

now---- I guess all I need is a sub amplifier of about similar rating that runs on AC power.... takes line out from my amp and I am sone.

Where would I get required parts- like this in Mumbai?

KD
There are some ICE installers who sits on the roadside of the Lamington Road (They have makeshift stalls on the footpath). They will be able to provide you with the car subwoofer enclosures. On the amplification front you can either import the plate amps from Madison or alternatively use a car subwoofer amp and get the power supply made by the local electronics repair shop.
But, be aware that this set up will not sound like the subwoofers used in homes and would be a big compromise (but save you from throwing or selling your subwoofer). You are about to open a can of worms I say .
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Old 13th October 2010, 07:10 PM
 
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Re: Convert a car subwoofer to home use

Can you explain why a car sub would not sound good in a home setup. Except for loss of cabin gain i see no major diff.

I am considering using a car sub for home use. Reliance digital has quoted Rs 2090 for JBL GT5-12 sub. It is 12" , 275 watt RMS driver with response from 23 to 450HZ.
My setup would be sealed design and box dimensions are mentioned in JBL tech sheets. Would be using 18 mm MDF for cabinet design with bracing.
It would be driven by EAS controller and subwoofer amp designed/developed by rod elliot.
Not sure about the amp yet- to go for class AB or class D.
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  #6  
Old 13th October 2010, 08:54 PM
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Re: Convert a car subwoofer to home use

In a car, the room gain starts at a very high frequency (say 70hz). As long as a sub is able to go to that level flat, the room gain will take care of the rest and you will be able to hear much lesser frequencies, the jbl in question goes to 35hz.

When you take this sub out of a car and put it in a room, the room gain starts at 30hz. your sub cant do well below 70hz and it doesnt cover freq below that. what u'll hear is a major lack of bass.

my suggestion to u is to sell the sub. to get anything out of this means you'll have to rebuild the cabinet and waste the existing one. You will also need to know the T/S parameters to design the sub. and purchase an amp for this. And in the end you dont even know how low it'll go until u try it out. So, sell it and purchase a different sub, or better, make one
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Old 13th October 2010, 09:10 PM
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Re: Convert a car subwoofer to home use

Quote:
Originally Posted by tejasnaidu View Post
Can you explain why a car sub would not sound good in a home setup. Except for loss of cabin gain i see no major diff.

I am considering using a car sub for home use. Reliance digital has quoted Rs 2090 for JBL GT5-12 sub. It is 12" , 275 watt RMS driver with response from 23 to 450HZ.
My setup would be sealed design and box dimensions are mentioned in JBL tech sheets. Would be using 18 mm MDF for cabinet design with bracing.
It would be driven by EAS controller and subwoofer amp designed/developed by rod elliot.
Not sure about the amp yet- to go for class AB or class D.
the GT5-12 models down to 35hz f3 with a sealed enclosure. with room gain in a 200sq ft room, you should get useful response to 28hz if not better. but for a system "q" of .71 you need a 200litre enclosure.

if you use a 100litre enclosure; you get a "q" of around .85, which should be fine for HT use. f3 is modelled at 37hz in this case (still pretty useable)
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Old 13th October 2010, 09:27 PM
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Re: Convert a car subwoofer to home use

Quote:
Originally Posted by tejasnaidu View Post
Can you explain why a car sub would not sound good in a home setup.
because your car cabin is not as big as the room in your home where you listen to music-

subwoofers are designed (very exactly) to perform in particular locations/environments.

they are specialised - and designed for particular applications - much thought and engineering has gone into this -

naive to expect native intelligence to go against established tenets, and put a raging bull in a fine cutlery shop and expect no damage.

and tejasnaidu - do you know why the human race has achieved? -

only because we build on the (broad and capable) shoulders of geniuses.

we see far into the distance - not because we are tall-

it is because we are seated on giant's shoulders -

and when you ask this lead question - "WHY?"

do not forget the legacy - and do not forget to search the world-wide-web (www) -


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HMOG (holy mother of god)!!! - venkatcr - looks like i am filling in for cranky - and i know you have a hawk's eye out for me!
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Old 13th October 2010, 09:53 PM
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Re: Convert a car subwoofer to home use

Quote:
Originally Posted by tejasnaidu View Post
Can you explain why a car sub would not sound good in a home setup. Except for loss of cabin gain i see no major diff.
Cabin gain is everything (well almost, and that too in a car). in a car, you can get away with a teensy subwoofer due to the cabin gain, an f3 of 70hz is great in a car. try the same sub with an f3 of 70hz in a room and you will see the difference.

A car sub would not sound good in a HT means a car sub with a cabinet designed for the car wont sound good in a HT. If you take a car audio sub driver and design a cabinet from grounds up, you can get a pretty decent performance. of course it depends upon your driver too. There are companies that use the same drivers for both home and car use, e.g. elemental designs.
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Old 14th October 2010, 12:40 AM
 
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Re: Convert a car subwoofer to home use

For GT5-12 sealed enclosure

Based on Qtc of 0.7, the volume comes to 119 litres and F3 is 35.3 Hz.

The above values are calculates using T/S parameters from JBL specs sheet.


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