In wall speakers


I am designing a system for a client that requested in wall speakers for a particular application. My bias is obviously towards more conventional models, but to be fair, I am a novice in this area. Has the technology improved in the last decade?
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Why not post the application, home theater, background music, serious listening, how many locations, etc.
An excellent speaker designer, Philip Clements at Solusspeakers.com (yes, two letters "s") 1-602-437-4445
can go over using the Solus Architectural Series in-wall speakers.
"Diamond Reference Series", especially DR-ir8 Ribbon in-wall with 8" woofer is evolved from the older floor-stander Clements RT-7 which has occupied its place of honor in my main system almost a quarter century.
The website is not evolved, just the great products.