Hooking up JBL Subwoofer to Sony STR-K750P Home Theater system
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New member Username: NeonfishPost Number: 1 Registered: Apr-08 | I have a 12" JBL Subwoofer (4 ohm I'm assuming? Not sure) that was given to me by a friend. This woofer was in his car, and I'm trying to see if its possible to hook it up to my STR-K750P home theater system. The back of the sub-woofer has inputs for positive/negative speaker wires, and the back of the system has an RCA input for the sub-woofer. I bought a 24" RCA speaker wire (RCA plug on one end, +/- speaker wire at the other) at RadioShack (http://www.radioshack.com/sm-buy-the-24-ft-18-gauge-speaker-cable-with-rca--pi-2 102959.html) to try connecting the woofer to the system, but when I tried it no sound at all was coming out. Any idea why? When I try connecting the woofer as a center speaker using speaker wire, it works, so I think that means the problem isn't with the woofer. I'm assuming the problem is with the wire I purchased? I'd appreciate whatever help you can offer! Thanks! |
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Silver Member Username: JrbayLivonia Detroit area, Michigan USA Post Number: 164 Registered: Feb-08 | Is there a model number on the JBL sub? If it is for a car it is likely to be passive and therefore need an amplifier as when you hooked it up to your center channel output (unlike hooking it to your "sub out" terminal which is line level or un-amplified) . To use this sub properly you would need a sub amplifier. |
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New member Username: NeonfishPost Number: 2 Registered: Apr-08 | Took the sub out of the case, can't find a model number. But it does say that the recommended amp power is 12W-200W, and confirms that its 4 ohm. Maybe those can be a clue as to the model number... Ya, and I just learned that the sub out is unamplified :/ A friend told me I can rig a 200W+ PC power supply to a mono car amp, and use that to power the sub. I may have a mono amp laying around somewhere... any idea on how to do this? The sub was free, so if I'm unable to rig it then it's not a big loss. But it would be a nice addition and a fun project.  |
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Silver Member Username: JrbayLivonia Detroit area, Michigan USA Post Number: 165 Registered: Feb-08 | Hopefully you meant DC power supply! A PC power supply conjures up all sorts of ideas If you have the amp and power supply then this would be fun. The connections would be determined by the inputs on the amp. Assuming you have a Sony Sub, does it have a line OUT RCA jack on the back of it? |
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New member Username: NeonfishPost Number: 3 Registered: Apr-08 | Nope, I meant PC :] https://www.ecoustics.com/electronics/forum/car-audio/17571.html The sub is JBL, with +/- terminals on the back. The receiver has the OUT RCA jack. |
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Silver Member Username: JrbayLivonia Detroit area, Michigan USA Post Number: 166 Registered: Feb-08 | A Computer power supply would be crude but if you already had one then it would work. If you are running out to buy something I would get a AC to DC bench power supply: 25 Amp for $110 http://www.radioshack.com/sm-25-amp-switching-dc-power-supply--pi-2103961.html as opposed to a 500 watt PC supply for $99 http://www.radioshack.com/product/index.jsp?productId=2484186&cp=&sr=1&origkw=Co mputer+power+supply&kw=computer+power+supply&parentPage=search BTW- 25 Amps = 3000 watts @ 120 volts |
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