Ok well I have some news although not good news.

I have found out that the sub has died... I will be taking to the dealer as it's under the 3yr electronic and 5yr woofer warranty.

I did check the fuse but it's fine.

This has been the drama with my trying to get it to work as I have an older Velodyne (17yrs old) and used XLR to RCA adapters and it worked fine.

My fault as I was trusting a relatively new sub to be working and I had used it with my amp and receiver in a previous room setup at my old house etc.

Thanks for everyone's input and help and sorry for not even thinking the sub could have been dead.

Craig

Theatre Room: Sony 4K VW500ES, 861v8+ID41, HD621, DSP6000's, DSP5000C, DSP5000's, Oppo 205, Sat STB, XBox One X, Stewart Cinemascope Screen, QNAP TVS 1271U-RP (96TB) with Sooloos/Roon core pkg.