piobob, I am having the same problems with my neighour and my PV1, i have it so low now it defeats the object and I have a very nice but expensive paperweight !
I have one last option which is to move it into the conservatory which joins onto the lounge and as the is not connected to next door hopefully that will resolve the problem, just dont know what is will do to the sound quality.
If that fails then I had thought about building another party wall between us using good quality sound proofing material, but that is expensive