i have a 9835 from alpine and have a software upgrade suggestion for them since it seems that the internal software can be updated by them. i think it would be fantastic if one could use the headunit to power a 3 way system with the fronts being a set of separates with a passive crossover (pretty universal ...) and the rear outputs could be used to power some smaller subs ... this would of course require that the front outputs be can be setto high pass at say 70 Hz (which they can in a 2 way system) but also that the REAR speaker outputs play a LOW pass output from the rear outputs (which is currently not possible). seems that this could Eadily be done with a few lines of code ... anyway, alpine seems to have a TERRIBLE method of allowing customers to send them feedback (basically they want you to contact a dealer, who will want to sell you more stuff or simply not contact alpine). anyway, if anyone has a way that i could email an alpine tech that would be fantastic!!