i upgraded from 805S to 804S about a year ago for use in a smaller room than yours, seated at a closer distance than you describe. i agree with earlier comments that the 804S perform very well even in a "near-field" environment. playing at low level was not an issue. biggeest improvement was much tighter and deeper bass. i was using a BAT VK-75 amp and BAT VK-31 pre with very good results.
the 805S's are amazing monitors, but i think you would find the 804S a noticeable improvement. i did.
the 805S's are amazing monitors, but i think you would find the 804S a noticeable improvement. i did.