I always presumed Linkwitz was talking about recorded acoustic instruments and voices, but could be wrong. Yes, I agree it's all an illusion anyway....
One of the obstacles to overcome with dipole bass (other than lack of output due to cancellation) is that it can easily become lumpy and as Gary says...
Hi Barry, the distance was only about 1.5m (I have now moved the transmitter of course). I suspect the issue was exacerbated as the new hifi location...