Inphase USW12 Subwoofer

I've just installed the above sub and I cannot recommend it enough!!!  I bought is as it doesn't need an amp and I was going to put it under the seat.  Unfortunately it didn't fit so it's gone in the boot. but it is way smaller than your standard sized subs and really kicks out more ooompf that you'd ever think  

That's handy - I thought all subs would need an amp, but then I don't know much about ICE!  

I fitted some Inphase components in my old MK2 GTI and they were good value for money and good sound quality too.

I thought all subs needed an amp too. How does that work then?

It's an active sub so it has an amp built in it, not sure how it's powered but it must get a feed from somewhere?
USW12 Dual underseat active subwoofer system 600 watts with
 

i've got  Inphase USW10's under each front seat which work really well.