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Amp level versus line level inputs for subwoofers

I'm trying to learn something about subwoofers and have noticed that some subwoofers have a choice of input type. Could someone please explain the difference between these two types of inputs and the relative advantages and disadvantages of each?

Basically, I think a sub with both types of inputs can receive its signal from either the system's preamp or its amp. I assume that if the signal comes from one amp or mono amps, the sub would then retain more of the sonic characteristic of the main amplifier and less from its own internal amplifier.
peterayer

Showing 1 response by xti16

xti16
1,525 posts
 
Line level comes from the amp output (or from the speaker) but is a very high impedance (on the sub) which means it is sensing the voltage and not using any real current to drive it. The best scenario (in my opinion) would be a sub out from the pre with a built in (or external that would go between the pre and the amp if not built in) crossover. That way there would be more available current for the speakers since that power won't be wasted on something the speaker can't reproduce audibly. Without a built in or external crossover that current is still going to the speakers. So if a crossover is not possible I would prefer line level.

Hope that helps
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