Thank you Wayne, that's the best mail I've received in a long time! It answers a lot of questions that have been floating around in my brain...and yet so many remain
Regarding the PRV Audio D290 Pv, it has an advertised sensitivity of 109 dB, which is really close to B&C DE 250's sensitivity of 108.5. At least in th ball park, eh?
I'm excited for this project. Thank you again, Wayne, for your generosity!