Peter I have a spare set free shortly, if i can find someone I trust to fit the new head unit and tweak the cables.
Alpine CDR117Ri coming out.
I currently have the spare Audison (older but good quality) LRx2-500 Stereo amp if you need to swap the power side of the system for testing.
Mine is almost certainly down to cabling but I am not certain if it is on the high or low power side.
I have yet to get down the end of the footwell to find the darned amp that someone kindly pointed me at.