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Thread: Adding a powered subwoofer |
    
Bronze Member Username: Kingdufus
Beantown
Post Number: 11
Registered: Apr-04
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| Posted on Tuesday, June 29, 2004 - 04:06 pm: |
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Hi all,
I'm considering adding a powered subwoofer (a cheap one on ebay) to my cheap home theater system, which currently has a passive subwoofer. Do I have to worry about ohms and/or watts? Am I better off getting a better passive speaker? Granted, it's a cheap system and I shouldn't expect much, but I'm hoping to at least boost the Bass output. (System: Kawasaki AV1000) |
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Silver Member Username: Project6
Post Number: 981
Registered: Dec-03
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| Posted on Tuesday, June 29, 2004 - 06:58 pm: |
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if it is powered, it will be independent of your receiver. |
Bronze Member Username: Kingdufus
Beantown
Post Number: 15
Registered: Apr-04
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| Posted on Thursday, July 15, 2004 - 04:56 pm: |
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Hi Berny,
Thanks for your response. I'm concerned about frying my amp, since the specs for the powered subwoofer do list ohms:
20 WRMS into 4 Ohms, 40 Watts peak
Frequency Response: 25Hz - 110Hz
Low-level (RCA) Input: >15 KOhms
Universal Input: >15 KOhms
My amps subwoofer is 25 watts, 8 ohms.
I just want to make sure I won't do any damage by hooking it up. Do you think it's still safe?
Thanks! |
New member Username: Os2dude
Marietta ,
GA
USA
Post Number: 4
Registered: Jul-04
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| Posted on Thursday, July 15, 2004 - 06:06 pm: |
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This is possibly an ignorant question, but could you add a 4 ohm resistor to either the left or right wire and bring it up to the required 8 ohms? |
Gold Member Username: Project6
Post Number: 1067
Registered: Dec-03
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| Posted on Friday, July 16, 2004 - 12:40 pm: |
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Chris,
if the subwoofer is powered, you don't have to worry about the impedance. It will have its own power supply and amplifier within the subwoofer so it is independent of the receiver. it will work much like another device like a tpae deck, all it needs is the output signal from your receiver and not the speaker signal. |
Gold Member Username: Project6
Post Number: 1068
Registered: Dec-03
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| Posted on Friday, July 16, 2004 - 12:42 pm: |
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the 4 ohm resistor will not work |
Bronze Member Username: Kingdufus
Beantown
Post Number: 16
Registered: Apr-04
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| Posted on Friday, July 16, 2004 - 02:24 pm: |
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Thanks everyone. A follow-up question: My receiver has a separate speaker signal for the subwoofer via a dedicated L and R speaker connection, but no additional output for the sub (such as an rca plug). The sub I'm planning on buying has both, speaker inputs and an rca jack. Even if I use the speaker inputs, is there still no impedence pull? Thanks! |
Gold Member Username: Project6
Post Number: 1074
Registered: Dec-03
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| Posted on Friday, July 16, 2004 - 02:43 pm: |
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Lester,
If you are using the L and R speaker connection for a dedicated subwoofer, you will have an impedance load. This dedicated speaker signal is for a passive subwoofer, but if used to connect to a high level input of an active subwoofer, it shouldn't matter unless otherwise specified on your subwoofer. |
