Fitting the preamp outputs was just the start:
Route signal cables into boot down driver's side of car
Route power cable down the passenger side
Buy cheap MRV-F407 amp on E-bay
Fire up MRV-F407 on the bench and find it has a fault (no mention of this on EBay)
Fix fault on MRV-F407.
Fiddle around getting the amp into the first aid kit compartment in boot
Fiddle around routing cables to head unit
Well, finally finished the job today, and it sounds absolutely superb! The advice about the standard speakers was spot on. They sound excellent when fed from a decent amp. Even without a sub (yet).
The CCR2006 sounds very good when relieved of driving the speakers too!
I should confess one sin I committed during installation. The ISO connectors to the head unit are in a single moulding with the 20 way connector to the MID, etc. I had prepared a pair of short adators to go between the vehicle ISOs and the radio ISOs to access the speaker signals and antenna signal for the amp. However, I had no way of extending the 20 way connector. It was a choice of splitting the connector moulding and hoping I could still make it work, or braking into the vehicle loom to pick up the required connections. Given very little space behind the head unit for a shedload of connectors in any case, I chose the latter.
Kevin