Upgrade from Quad 11L?

Agree with idea to experiment with wires. Contact The Cable Company for advice and access to demos. Or, check out these Internet vendors:

http://www.anticables.com/products.html

http://www.audioartcable.com/

http://www.bluejeanscable.com/

http://signalcable.com/

http://marc.stager.com/silver/

http://zebracables.com/

Agree with Bob about working with the room, especially placement. Have to disagree about cables, at least until you have basic good quality throughout, and this does not need to coast an arm or a leg if you investigate my suggestions above.

Try putting a dot of Bluetack under each corner of your speakers where they sit on the stand to provide a bit of isolation from you electronics.

Here is a suggestion for isolating your CD player on the same structure as your speakers.

Operating under the assumption that vibration is bad, differentially affects your CD transport and digital components, and that the vibration is coming through the structure of your rack - I would get the largest, hardest and heaviest chunk of hardwood you can find that will fit in your rack under your CDP, a maple chopping block is a good place to start. Place your CDP directly on the block and place the block on several Black Hole sorbothane dots (http://www.tweakshop.com/BlackHolePods.html) between it and your rack. This will isolate your CD player from the rack, give it some extra mass to both resist external vibration and a place for its internally generated vibration to dissipate.

A place to start that has worked very well for me in a rack system that is far from ideal and placed by necessity closer to my speakers than I find ideal. You can experiment with isolating your amp as well using vibrapods or Herbie's footers, but I find my solid state CD player is much more sensitive to vibration than my solid state amp. Tube amps may be a different story...

Your description of Naim's 5 series gear is dead on from my experience. Glad to hear you are enjoying music again!