Klipsch RP-600M II at 5 metres: is an 80 W receiver enough for a living room?
105.6 dB at the seat — comfortable for music, 5.4 dB short of the 105 dB film reference. Reaching reference at 5 m would take 281 W per channel, which nothing in this class has.
For music, yes. For Dolby reference level, no — and neither is anything else at this price.
At 5 m the receiver's 80 W into the 94.5 dB Klipsch give 105.6 dB continuous at the seat: 5.4 dB below the 105 dB reference peak. Ordinary listening at 85 dB average asks for 2.8 W, so the receiver spends most of its evening barely awake.
Reference at 5 m needs 281 W per channel. No five-channel receiver in this price class has that, and the arithmetic gets worse than the single number suggests: receiver power figures are quoted with two channels driven, not five, while every channel draws from the same power supply. The rating on the box and the load in a film scene are not the same test.
What to do. Move 2.5 m closer and the same receiver gives 105.6 dB, because halving the distance is +6 dB and costs nothing. Or run at roughly −5 dB relative to reference, which is what most people do anyway and what the volume dial's numbering assumes. Adding a subwoofer helps more than a bigger receiver: it takes the bass off a bookshelf woofer, and bass is where the watts go.