The unit I mentioned is the S3HI4 (4 channel high level converter, part of the Series III range). I was intending to use their amps, but to be honest cannot afford not to use what I already have, what with all the other stuff I want to get sorted on the X5. I will be buying an S3HI4 though. I could get another if you want and ship it to you if that would help?

Their website is http://www.genesiscaraudio.net/, but not great to be honest, although they are aware of this and in the process of sorting it out - as a web designer I offered to help, but they have someone already in place:-( Unfortunately, the S3HI4 is not mentioned at all, only their amps and speakers.

The 6XS output has level adjustment and I'm sure can be controlled to be compatible with my amps, but I'm waiting on a response from AudioControl to confirm.