I used the Pioneer 6 disk cahnger on both my 1500 and 1800. The cables are long enough to easily reach the fairing pocket from the top trunk. Mounted them vertical against the front of the top trunk. The modulator box goes under the seat. The control head is not waterproof so it was mounted so that it could be put inside the fairing pocket when it rained.
THEY DO SKIP !
Have moved on to an Apple Ipod that does not skip and holds tons of music.