Recommendations please for close-to-wall book-shel

Some Linn's. Some Klipsch's.

Hi Eril, what about single driver" full range" systems like CarolinaAudio JSM [ jordan module ] , or Qmega Super3 and grande 6 [ fostex ], or bass reflex " minimonitor " from Common Sense Audio [ w/ fostex, lowther, or Audio Nirvana ], the purity of single driver systems is addictive and should be a very good match for the Cairns. Just a thought, good luck, there are a zillion choices! Thanks for reading, Alan

Depending on your budget, the Ultimate Monitor by AudioMachina is worth checking out.

Soliloquy SAt 5 should fit the bill. I use 2 for surrounds in my HT, but they are actually decent as mains suprisingly.

Von Schweikert VR-1s. I have them in a 12" deep bookshelf (not my idea, a compromise with the spouse) and the imaging and width of the soundscape is wonderful. There is a small "port" on the back described by Von Schweikert as pressure relief. It doesn't act as a port. I am very happy with them. $999.

Linn Tukans go close to the wall, and may make it down to 55. Might be more like 60. Not very expensive ($350).

I would suggest a front ported speaker or a sealed cabinet. Stay away from rear ports.