I have been driving a 2010 Punto Emotion Pack up until December 2013 when my dad decided to shift to a car from his Activa/2 wheeler that he has been driving since the beginning. So he took my Punto and we got a base model of Punto this december. The 2010 Punto has factory fitted head unit (HU) + Blue&Me with USB port + steering controls, after market speakers and dampmat damping and I was happy with this basic sound output. Now, I am driving a Punto Active variant. It has a CD player but no USB. The sound from the factory fitted speakers is beyond my satisfaction but there are two things that I seriously miss/want. 01. Bluetooth (Just like Blue&Me) 02. USB port 03. Steering remote With a heavy heart, I have decided to change the HU as I did not want to spoil the looks of the center console by changing the HU. Being under budget, I wish to spend as little as possible. I won't be changing the speakers or adding amp+sub initially but may do this later after a few months if the budget permits. Moreover, I do not like to add too much extra wiring so I am not likely to add an amplifier +/- subwoofer but still asking for the sake of futureproofing. Budget for the HU is maximum 10k but I do not wish to spend extra and VFM is what I am looking for. Shortlist: 01. JVC KD-R80BT 02. JVC KD-R746BT JVC KD-X50BT is rejected because it does not have a detachable face plate. Few things that played a role in this shortlist are: - The reviews for this JVC system seem good, infact better than Pioneer. - No Pioneer or Kenwood model that I "saw" on their offcial website "sounded as good" as JVC. lol. - Button to pick up call is placed to the right of volume knob in these JVC models so lesser distraction from road. Things against JVC: - Local shops don't encourage these JVC HUs and always recommend Pioneer, stating better A.S.S. - Aftermarket steering remote is not easily found for JVC, not even on eBay etc. Now out of these two HUs, R80BT as well as 746BT have same features (Bluetooth, USB, external mic and everything). R746BT has 2 RCA Pre-outs whereas R80BT has 3 RCA pre-outs. Additionally, CD slot in R80BT is internal (you have to flip the faceplate downwards to insert CD) so maybe lesser dirt goes in I guess. Now, this is where I need help of the experts and I have a very specific question to ask: Consider this future set up: Head unit with 3RCA pre-outs-->powering rear coaxial speakers directly + connected to a 4 channel amp that powers front comps + subwoofer. So the question is: An answer to this question is all I seek. 2 RCA systems: - In systems equipped with 2 RCA pre-outs, 1 goes to the front speakers whereas the second is selectable, i.e. can be used for rear speakers or the subwoofer. - If it is selected for the rear speakers, then fader controls are retained whereas subwoofer control from HU is lost. - If it is selected for subwoofer control, subwoofer controls are retained whereas fader controls are lost. 3 RCA systems: - There are 3 RCA (1 for front, 1 for rear and 1 for subwoofer controls). - Ideally, a 4-channel amplifier is connected to the front and rear speakers using 2 RCA preouts out of the 3. - A mono amp is connected via 3rd RCA and subwoofer is hooked to this. - Now, if one wishes to use only 1 amplifier, a 4 channel amp can be used for front speakers and subwoofer whereas rear speakers can be powered by the head unit directly. Please correct me if I am wrong. The difference between the 2 HUs is 3.5k which can be used for other purposes like damping or getting better wiring set.