It is passive, no amp built in or included.
A passive subwoofer doesn't have a built-in amp and will require the use of an amp.
its on sale at best buy
The nest was built by birds.
I think I've heard of elctric guitars with a built in amp so yes
The Audio-Technica AT-PL50 does have a built in pre amp.
we will we will rock it
some models have a built in amp under the dash on the passenger side i bypassed it with a wiring kit from crutchfield
I would not advise this, because of the difference of impedence.
Pioneer DEH-P4900IB iPod and XM Sirius Ready AM/FM CD Car Stereo Head has a built in amp.
It has to have resistors but an active filter will alsol have an active device, usually an op-amp, while a passive filter has only passive components and needs no power supply.
Yes, they can play fine without an amp because they have a built in speaker.
it built into stereo