I find Genelec setup guides quite comprehensive and useful (see their web site).
http://www.genelec.com/learning-center/presentations-tutorials/placingloudspeakers/
http://www.genelec.com/documents/catalogues/Genelec_Monitor_Setup_Guide_2011.pdf
Hi, thanks for this. In the first link it refers to placing speakers closer to the back wall to help eliminate/reduce the reflections. It talks about distances of about 20cm. As, according to Spendor, I can place my A6s at this distance, which I had already done, I'll stop worrying about this aspect. (Unless somebody tells me I've made some terrible error)
A few more soft furnishings strategically placed is what is required.
Just a comment about my A6s as a step up from the Dynaudio DM2/6s they replaced. There are CDs that I can now listen to and enjoy because the Spendors have opened up the music making it more intelligible. Examples of this are Cornershop - 'When I was born for the 7th time' and Gorrilaz - 'Plastic beach', which previously sounded muddy and cluttered, but now I can hear so much more than before. (I have to say thanks to Dale at Fanthorpes for his patience while I made my choice and for allowing so many home auditions.)