The standard Rover radio unit has a single (stereo) amplifier chip, one of the TDA range iirc, and that will have short circuit protection. The other head unit probably had some other arrangement. I'm not saying that it's a guaranteed thing, but all evidence given points to a problem with the speaker wiring in or close to the door.
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Need a T4 ?: T4 Owners Map thanks to Stevestrat ( use at your own risk)
Where?:
https://en.wikipedia.org/wiki/Tanelorn
Mods/Retrofits:
PCV vortex 'filter'; bluetooth; inline thermostat; reversing sensors; plenum spyhole ; headlamp washers ; Diy mp3 player replacing CD multichanger; FBH with remote; Headlamp washers; black/chrome front grille, rear blind; Xenon projectors
To do:
puddle lights; 2 Din cd/nav to fit; boot release button
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