Solved! Help converting a passive sub-woofer into a powered one please

May 3, 2020
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I have a jvc subwoofer (model-sp-thg50w) and its power handling capacity is 450w, impendence is 3 and it cannot be hooked up without a source of power, apparantly.

Is there anyway someone could tell me what the cheapest method of powering this device would be?
 

Sonic Illusions

Prominent
Feb 16, 2019
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I'm not sure I'd trust the spec's on your subwoofer, as far as power handling goes, but 3 ohms can be a tough load. Your amp delivers 225W @ 3 ohms to the sub at 10 percent distortion. Most spec's I've seen and trusted read like this for example: 225W continuous RMS power into 4 ohms, with 1 percent or less distortion. So the rated power of your combo at 225 watts includes significant distortion.

So here's what I recommend:
Using a multi-tester with ohm meter, check the DC resistance of your sub. Then call Parts Express (800-38-0531) with this information and ask if the following amp will run okay without running too hot at that load. Most 4 ohm amps are fine with a DCR of 3.xx ohms. This amp will deliver clean power and may be a great solution at that power level.

This is a good spec and it's for this amp. Rated power output (1% THD): 156 watts into 8 ohms, 233 watts into 4 ohms.
https://www.parts-express.com/dayton-audio-sa230-230w-subwoofer-amplifier--300-813
 
Last edited:

Sonic Illusions

Prominent
Feb 16, 2019
186
19
765
28
I'm not sure I'd trust the spec's on your subwoofer, as far as power handling goes, but 3 ohms can be a tough load. Your amp delivers 225W @ 3 ohms to the sub at 10 percent distortion. Most spec's I've seen and trusted read like this for example: 225W continuous RMS power into 4 ohms, with 1 percent or less distortion. So the rated power of your combo at 225 watts includes significant distortion.

So here's what I recommend:
Using a multi-tester with ohm meter, check the DC resistance of your sub. Then call Parts Express (800-38-0531) with this information and ask if the following amp will run okay without running too hot at that load. Most 4 ohm amps are fine with a DCR of 3.xx ohms. This amp will deliver clean power and may be a great solution at that power level.

This is a good spec and it's for this amp. Rated power output (1% THD): 156 watts into 8 ohms, 233 watts into 4 ohms.
https://www.parts-express.com/dayton-audio-sa230-230w-subwoofer-amplifier--300-813
 
Last edited:
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