ALL IN - Radio Replacement - Need help!

2005 Mas Spyder with Auditorium 200 system (with sub box)


Well I was tired of shitty speakers and an intermittent radio! Instead of trying to keep this thing running I am replacing everything. I haven't totally decided if I am going to just shit-can the Infotainment System, but I am definitely relocating it and replacing with something better as far as sound.


Here is the list of components that are being installed:
Alpine iLX-007 Carplay Head Unit
Rockford Fosgate R600x5 5-Channel Amp
Focal Utopia Be 13WS Sub - Fits in original sub housing
Focal ISS170 Component Front Speakers
Focal Performance PC130 Coaxial Rear Deck Speakers


Here is my issue....
I started with replacing the speakers first as it was just plug and play or as I thought it would be. Since my Mas headunit doesn't put out sound (or I should say when it wants to -- and it hasn't lately). I figured I would just use the original connectors from the speakers and solder to leads from my new speakers. All went well until I started trying to power up the speakers through the amp and new head unit.


From all the threads here, I was able to determine all the lines coming from the ISO connector on the factory headunit in the center console to the original amp in the trunk seemed correct and follows the standard ISO-Spec for speaker outputs -- 8 small gauge wires (4 pairs).


The TROUBLE appears to be the 8 wires (larger gauge - 4 pairs) coming from the original trunk mount amp to the speakers. 5-Channel System with only 4 channels coming from the amp. AND a bunch of wires that don't make sense.


Here is what I found for the output of the Amp (numbers are connector pin numbers as shown on the connector and here in another thread):
10 and 18 - yellow/yellow-blk
11 and 19 white/white-blk
13 and 21 green/green-blk
14 and 22 gray/gray-blk
None of these go straight to Front or Rear speakers with these colors!!


The only thing that Ohms out directly are the green pair and gray pair that actually goes straight to the Subwoofer -- for some reason there is a coaxial type speaker for a Sub.


Here is what worked so far:
Rear Deck Left - 10 and 18 - yellow/yellow-blk
Read Deck Right - 11 and 19 white/white-blk
I used 13 and 21 green/green-blk for the Sub




OK RESET -- Disconnect all speakers and start over -- Here is the deal ------------------
If you have this system with Front Speakers (Component sub and tweeters), Rear Deck Coaxial, and Single Sub, Maserati did some really stupid stuff. The FRONT DOOR and REAR DECK speakers are tied together on left and right front speakers from the Amp, and the SUB has the rear two channels connected to one SUB. What a stupid way to wire a sound system. I have only had the car for a couple years now and only drive it occasionally. The system never sounded that great (when it came on), and I knew I had at least a blown sub.


My solution:
I cut the Sub wires and ran them to the Rear Deck Speaker as these were the Gray pair and Green Pair from the amp and everything I find shows these as the Rear Speaker output. I kept the existing Front Speaker outputs (White pair and Yellow pair) set up for the Front Door speakers as I didn't want to run those wires. Finally I ran a new set of wires to the Sub. Now I have true 5-Channel system.


What a freaking nightmare to figure out what was going on. It wasn't until I disconnected all of the speaker could I truly ohm out the cables and see how everything was connected. You should see how many pieces this car is in!


Now to reassemble and start to finish my new dash.