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Can you run a 100w replacement sub woofer speaker in a 35w active sub woofer?
I have a Home Theater 35w Jamo Sub Woofer speaker box. The speaker is ruined (the soft rubber disintegrated - dunno how, I don't push it). I want to replace the speaker, my local electronic store can get hold of a 30w and a 100w Nippon Sub Speaker.
My Question is simple, will I get enough sound if out if I use the 100w speaker to match close enough to the old speaker, since it is almost 3 x the watt ratting?
Other info:
It used to sound loud until the speaker broke.. it probably has a powerful amp in the speaker box (its an active - is driven by its own amp) and used to distort slightly with music and the sub on full.
The whole system runs through a Sherwood amp which is pretty powerful. They drive the 180w floor standers nicely.
Also the room is quite large.. but the cinema is area is about 8m x 8m (with a Panasonic projector).
Speakers are not light bulbs, the power rating has little to do with how much SPL output it is capable of. There are important parameters you need the new woofer to match when replacing an existing woofer. In the simplest terms, Vas, Fs, and Qts need to match. Determining these values for the existing speaker is the hard part but you don't necessarily need that information. You can determine the required parameters from the box volume. If it is a sealed box, it's pretty easy but if it is a ported box it becomes more complex. The good news is that if it is a ported box and it's a cheap speaker then it was probably never correct to begin with, cheap speakers are almost always mistuned. That means you can choose the new one almost arbitrarily and not do much worse than the original design.
As for how much sound you will get from one vs the other, you need to know the sensitivity of each, the power rating has almost nothing to do with it. You just need enough power handling for it to handle the existing internal amplifier so if the new one has a higher power rating you should be fine.
The Sherwood amp should have nothing to do with it since you at least should be using it's preamp output for the woofer. Or if you are using its speaker outputs into a speaker level input on a powered sub, either way the Sherwood's power amp is not involved.
Update your question to include whether or not the box is sealed and the dimensions of the box. From that information it can be determined what you need the woofer parameters to be. Since it may be impossible to determine the sensitivity of your existing woofer there is no way to know which would be louder at a given power level. Just make sure the new woofer sensitivity isn't too low and the power rating not lower than the original.
mk
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