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They say there is no such thing as a stupid question

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A car is a very small room - the wavelengths you're making are larger than the enclosure dimensions - the whole "room" pressurizes at the lowest frequencies. Because of this, the sub in a car doesn't need to move very far at the lowest frequencies to get flat response - below resonance, the excursion of a woofer is constant with regard to input voltage, and that, in a small, sealed environment, gives you a nice, flat response down there.

In a larger room, where the wavelengths aren't bigger than the room dimensions, you need increasing excursion with decreasing frequency, so a car woofer won't give you the same low end. You'll get something at resonance, but above and below, car woofers won't do much - a dull, thuddy sound is what you'll get.
 
I tried this as an experiment. I made sure the impedance was OK, but the sound was mud. Nothing but "woof woof". And the car speakers are not made with the speaker excursion of a musical speaker, nor will they hold up under use.

Not worth your trouble.

Often, also low sensitivity. You might need a 1000W amp to be heard and your "1000W peak mythical power output" speaker might die at 100W.

I did use an old, circa 1980 hi-fi speaker with an amp full range across just the woofer with a tube amp, but that was real 80W RMS and the low sensitivity allowed me to dime a 15W guitar amp into it and not go deaf instantly. But that's only if use for recording and these days you can use a cab sim plugin in your DAW.

When that died I tried a car subwoofer that was around, also low sensitivity, and it was fine if you wanted recordings to sound like someone playing in the next door house.
 
... But I'm about to make them rethink that phrase with a question I have. Can you use a car sub woofer as a temporary amp cabinet if you have an amp head? Could you rig up a quarter inch jack and use it for a short while?
Yours is not a stupid question. I had a loudspeaker dealer and repairing suggest a car speaker for me. A sub might not have enough of a range for you. Is it passive? As long as you have the right power handling and impedance, you'll be OK.
 
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