I have a had a pair of RS-2B's for over fifteen years and I do not anticipate their replacement as they sound as good as anything else I have heard costing less than $15K.
I think your level problems are related to amplifier sensitivity and not speaker efficiency. You said the Carver was a "Pro ZR1600". While I am not familiar with Carver's current products, the fact that it is labeled as a pro amp means the the sensitivity is likely to be lower than a consumer amp. Pro gear operates at a level that is 14 db "hotter" than consumer gear (+4 dbV versus -10 DBV). That means that the PAS 3 will have to be turned up 14 decibels in order to compensate.
Since the RS-2B's allow passive bi-amping, please allow me to suggest that you try hooking the Carver amp to the EQ output and use it to drive the woofers. Then hook up your Dynaco Stereo 70's (use the 16 ohm taps - they sound the best) to the input parallel jacks on the EQ unit and use them to drive the midrange/tweeter arrays. You will get the best of both worlds - solid state power and control for the bass and the delicacy of tubes for the rest of the spectrum.
May I also suggest that you take an hour of your time and replace the sheet metal screws that hold the woofers to the cabinet with # 10X32 tee nuts and machine screws? It's well worth the effort as it will clean up the bass to an amazing degree. While you are at it, you should tighten the screws that hold in all of the other drivers. I find I have to do this every six months or so to keep these wonderful speakers sounding their best.
I think your level problems are related to amplifier sensitivity and not speaker efficiency. You said the Carver was a "Pro ZR1600". While I am not familiar with Carver's current products, the fact that it is labeled as a pro amp means the the sensitivity is likely to be lower than a consumer amp. Pro gear operates at a level that is 14 db "hotter" than consumer gear (+4 dbV versus -10 DBV). That means that the PAS 3 will have to be turned up 14 decibels in order to compensate.
Since the RS-2B's allow passive bi-amping, please allow me to suggest that you try hooking the Carver amp to the EQ output and use it to drive the woofers. Then hook up your Dynaco Stereo 70's (use the 16 ohm taps - they sound the best) to the input parallel jacks on the EQ unit and use them to drive the midrange/tweeter arrays. You will get the best of both worlds - solid state power and control for the bass and the delicacy of tubes for the rest of the spectrum.
May I also suggest that you take an hour of your time and replace the sheet metal screws that hold the woofers to the cabinet with # 10X32 tee nuts and machine screws? It's well worth the effort as it will clean up the bass to an amazing degree. While you are at it, you should tighten the screws that hold in all of the other drivers. I find I have to do this every six months or so to keep these wonderful speakers sounding their best.