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As above, ideally need to be less than 6" deep, any advise or ecperience
i've got a pair of arcam muso's that push out a rather good sound for their diminutive size.
Got some wall-mounted B&O's for sale if you're interested.
APF
I have a little pair of Monitor Bronze BX1s in my study.
Small, but punchy! Not in a massive room, though.
Can't go wrong with Tannoy bookshelf speakers, might just be small enough.
Just checked..10 inch deep.. Bargain though
[url= http://www.richersounds.com/product/bookshelf-speakers/tannoy/mercury-v1/tann-mercury-v1-oak ]Tannoy [/url]
audio engine A2's, tiny and sound great.
Mordaunt short m10 under 7 inch deep.
[url= http://www.mordaunt-short.com/products/m10 ]M10 [/url]
The slightly bigger m20 is 8.5 inch deep
[url= http://www.mordaunt-short.com/products/m20 ]M20 [/url]
Or another option which will definitely be small enough, it's a pc speaker though but very good and has built in amp and auxiliary input
Creative t20 or t40
[url= http://www.amazon.co.uk/Creative-Multimedia-Audiophile-Configuration-Technology/dp/B001IZZ2PO/ref=sr_1_3?s=computers&ie=UTF8&qid=1448580799&sr=1-3 ]T40[/url]
Those Tannoys look very good at that price...
+1 monitor audio
Not made any more but if you can find some secondhand AVI Neutrons they are superb.
I was also going to suggest AVI Neutrons, but they will be difficult to find.
Ophidian make some good small loudspeakers.