I now have tilt at +2 and bass at -2 and I think it's better.

Chris who sold me the units contacted me offline to say he was sorry I was having problems. This is great after sales service, so kudos to him. But let me repeat the bulk of the PM I sent him:

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Don't worry - they're great, and I'm really enjoying them. I don't think there's anything wrong with them - Boys Don't Cry by The Cure sounded better this evening than ever, with lovely crisp, clean treble - but I think I just need to get used to the M sound.

Each system has its own sonic signature, with strengths and weaknesses. None is perfect. I'm happy with the trade off ... but I do occasionally miss being able to hear the brush on the cymbal so clearly you can imagine it in the room. Now I have bass guitars and -wow! - grand pianos in the room, which I didn't have before. You pays your money...
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Duncan