Hello Sir,
Let me try to answer your questions:
1. What arm rest are you talking about? Is it the console box in the Center? If that is what you are asking the answer will have to be, no there is no way to adjust that. But if your unit has an arm rest...can you post some pics? I own a GLS SE and all I have on is the power seats with lumbar support and height control.
2. Yes, Happily, the KD BT22 has 3 RCA Preouts. Front Rear and Sub. I have upgraded much of my sound system except the HU as it sounds good. It has a Hi Voltage pre-out (which means a cleaner signal). It has a parametric Equalizer (5 band with Q adjustments...which is really nice), and has Bluetooth (double nice).
My system is still using the headunit and the sound is very crisp and I have actually measured the SPL reading in-car during a KAC sponsored event using a termlab spl meter and I posted a 139.9 dB reading. Not bad for a stock head unit eh? I actually plan on competing with the same head unit in a sound off this december and hoping to post higher scores (~140-142 db hopefully)
HTH :2thumbsup: