Hi. 7 + 2 + 4 = 13 speakers.13 speakers?
Fronts - Klipsch RF 7 III - 250W - sensitivity specified as 100db / measured as 93db
Surround - Klipsch RP 8000 - 150W sensitivity specified as 98db / measured as 92db
Rear Surround - Kilpsch RP 8000 - 150W sensitivity specified as 98db / measured as 92db
Centre - RC 64 III - 200 W - sensitivity specified as 99db / measured as ???
Atmos - 4 X Klipsch RP 600M - 100W sensitivity specified as 96db / measured as 89db
I read that Audioholics believe that Klipsch rate the sensitivity as real world, in room response, whereas they are measured for their anechoic response.
Subs are powered independently.
So, here are the figures, they are not intended to be a definitive reason to buy or not buy a power amp, but hopefully they are interesting to you, and anyone else reading the thread.
These are not taking into effect the room response, which is estimated to add on 6db, depending on the size of the room and the speaker placements within that room. It does take into account that each additional speaker that is added increases the SPL by 3db. And I am using an average listening distance of 3 metres / 10 feet.
89db sensitivity - 10 watts
92db sensitivity - 5 watts
93db sensitivity - 4 watts
99db sensitivity - 1 watt
105db SPL (Reference)
89db sensitivity - 29 watts
92db sensitivity - 15 watts
93db sensitivity - 12 watts
99db sensitivity - 3 watts
89db sensitivity - 37 watts
92db sensitivity - 20 watts
93db sensitivity - 15 watts
99db sensitivity - 4 watts
89db sensitivity - 74 watts
92db sensitivity - 40 watts
93db sensitivity - 30 watts
99db sensitivity - 8 watts
For balance - if there were 6 speakers, at a sensitivity of 87db, they would need 100 watts each to make a total SPL of 105db from a 3 metre listening distance.