huge amps (ngam-2 fill up the jazz trunk), very heavy too (15kg), quite underrated (4x100W but more like 150W). great detail and resolution, unlike normal alpine amps. not as dynamic as normal power amps, but thats normal for high end units. excellent amp...
the dvi-9990 HU cant be used on its own, it has to be combined with the PXA-990 processor or the DAI-990 digital to analog converter. either way it will cost 5 figures.