Alpine CDA9807. Got one installed yesterday in my new '04 Civic EX. 50Wx4 peak with 23Wx4 RMS power. Got 3 preamp outs. Even with no amp on stock speakers and wiring, this sucker is loud. Also plays MP3 and WMA. MX (Media Xpander) function brings out extra depth, especially with MP3s. All in all, this unit kicks major a$$ in my opinion.