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Old 1st February 2007, 08:08 PM   #1
jprac88 is offline jprac88  Canada
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Join Date: Feb 2007
Location: x
Question Using Car Sub in Home Theater

hello

I have a car sub woofer w/ enclosure and amp that I do not use in my car. I would like to use it in my home. How can I do that?
my subwoofer is 4ohm and home theater receiver 8ohm with subwoofer preout.
thank you!

my receiver is a Kenwood vr-306 and sub JBL GT100 and car amp Kenwood KAC-716.
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Old 1st February 2007, 08:16 PM   #2
thefish is offline thefish  United States
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You can do this (I have done it in the past) but you will need to find a large (expensive) 12V power supply for the amp. Dont worry about the difference in ohms since you will be using the car amp to power the sub. Connect the car amp to the sub as normal then connect the preout from your receiver to your car amp. The only problem then becomes how to get a 12V power source.

I built a 12V 1000W PSU for this reason using some old transformers (from ebay), a couple of paralleled 15A 1000V diode bridges, and some capacitors to smooth it out, its not hard to do but is a bit dangerous because of the capacitors.
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Old 1st February 2007, 08:40 PM   #3
jprac88 is offline jprac88  Canada
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will this one be enough 3amps AC/DC converter , there is a 6amps also for 30$ more. ?
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Old 1st February 2007, 08:40 PM   #4
jprac88 is offline jprac88  Canada
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btw these are the specs of my car amp (kac-716):

Mono Power Amplifier
Max. power output (4Q) 240W x 1
RMS power (4Q): 120W x 1 (30-200Hz, 0.08% THD); 2Q load capability (0.8% THD): 160W x 1

120W / 12V = 10 amps requiered as a power supply? is that right?
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Old 1st February 2007, 10:03 PM   #5
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It will need a bit more current than that, I doubt it's 100% efficient
Call it 15A to be safe
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Old 1st February 2007, 10:53 PM   #6
thefish is offline thefish  United States
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Quote:
Originally posted by jprac88
btw these are the specs of my car amp (kac-716):

Mono Power Amplifier
Max. power output (4Q) 240W x 1
RMS power (4Q): 120W x 1 (30-200Hz, 0.08% THD); 2Q load capability (0.8% THD): 160W x 1

120W / 12V = 10 amps requiered as a power supply? is that right?
That is the correct calculation but I would stay on the safe side and add 30-40% extra since your amp wont be 100% efficient, and also it is not good to push a power supply to its max...

120W * 1.4 = 168W
168W/12V = 14A

Really you should check ebay you can find a power supply for much cheaper there.

You may be able to get by with something like this (12A RMS, 14A surge) only $54 shipped on ebay.
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