Cool, thanks for sharing Nigel. Glad it's not just me that didn't like the n-Sats. They're like a pair of table-pinned mosquitos; fun for about 5 mins and quite well conceived but then you start to wonder what the hell they're for. Maybe the huge, matching sub makes them work as a more balanced package. Fair play to the designer for creating an articulate pair of speakers though.
I wish Spendor would make a larger version of the SA1 because it would be great for small to medium rooms that want a little more oomph. Just look at the range of sizes in the classic range.
I use a Rel Quake sub to support the bass of the SA1s. It's only a cheap sub (£400?) but after years of playing I've learnt that stacking about 15kg of slate on top cleans up the bass nicely. It doesn't add much at all but it's enough to augment the overall sound without swamping it with sludge. The crossover is set very low and it pressurises the room just enough to allow me to hear the low notes. Perhaps you could do another home demo of them with a sub. Another pair of speakers to try are the ATC SCM11 and 19. The latter uses the "proper" ATC 9kg advanced drive unit and can really deliver depth with accuracy. Have a read http://www.atcloudspeakers.com.au/?p=180.