Thanks for the constructive response millercarbon….the bookcases have a framing/molding that is exactly 26" wide, then the actual shelf area opens up to about 28" wide. Both sets of speakers are a shade under 26" wide, which will leave about an inch of space around the ends. There will be about 3" of space above the speaker tops, so I can fabricate a piece of material to fit those areas to keep reverberations down to a minimum. Even though this is my 'vintage' system (one of two, actually), I want to do whatever I can to make it sound its best. Your suggestion seems like a good one.
Is This A Bad Move?
I have a pair of Large Advents and a pair of ADS L-810s I want to use in the same system. Due to space limitations, I was forced to buy two nice higher-end bookshelf units that coincidentally had the exact measurements needed for the speakers (I took that as a sign I was on the right path). Unfortunately, the bookshelves are not open at the back, and I'm wondering if that will affect the speakers' sound to the point I'll be unhappy. The speakers will be in a horizontal position, which I know works well since that's how I've got them oriented now. I will drill holes in the cabinet backs and install grommets to allow me to run the speaker cables. I will have to make a decision on which pair should be on the lower shelf and I'm leaning toward that being the Advents. Anyone else been down this road?