This JVC unit is awesome! Was used in an open top vintage sports car requiring extra power to be heard. This unit not only has separate outputs for a second set of stereo speakers, but also a line output for a powered subwoofer. I have been unable to find anything similar. The unit also is removable from a sleeve, which contains all the proper wiring labeled and ready for installation. Unusually, this unit also has a a dedicated input for any line level device - mini plug input wire for iPhone or iPod or any device with a mini plug output. Really handy !

Cassette player works well too. 

Thanks for looking.