Regarding the outputs...
1) Check your fader setting.
2) Check to see if the wires have pulled out of the docking connector. There is a FAQ entry under "Troubleshooting" about this.
Failing those two, Support will help you, make sure you used the
carsupport@riohome.com address to reach the right person. Note that Monday is (I seem to recall) a Bank Holiday in the UK and therefore do not expect a reply until after Tuesday.
Regarding the Equalizer...
I have once tried using the EQ as a crossover. It doesn't work. It only reduces the frequencies "to a point", but does not do a genuine shelving crossover that completely cuts off the frequencies. Also, the automatic "Q" parameter won't work right for this purpose, you would have to carefully adjust manual Q setting and even then it wouldn't be perfect..