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Speaker sensitivity and wattage
Rami posted a topic in Technical/RestorationsHi all, Proud new owner of a brand new set of RP-150m bookshelf speakers paired to a Denon X520BT. Having “ascended” from a 10yo 50€ Hercules 2.1 “system”, I am ecstatic about the new system, it just sounds brilliant, also having had a great deal on both (300€ for the speakers and 150€ for the AVR). Being a complete novice in home audio systems, I’ve been silently rocking back and forth between here and AVSForums, and want to thank all of you for the amazing amount of information available. The following questions remain unanswered though, and I would be very happy to have some feedback. The RP-150m have a sensitivity of 93 dB at 1 meter (correct me if I’m wrong, but 93 dB is quite loud isn’t it?), which as I understand it means that they generate an SPL of 93 dB with just 1W of power. I usually sit close to the speakers (a foot away actually, they are correctly positioned as back channels but are connected as fronts now; I would also add that the system is calibrated for a listening position 10 feet away). As a result, I play them at a very low level, which I suspect is way below 93 dB, closer to say 50 dB. Does that mean that at that level, they are using much less than 1W of power, and if so how much power is being drawn from the AVR? In a more general terms, how would one calculate the power drawn from the AVR? By measuring dB levels and using the sensitivity and logarithm function? The context is also that I am planning on complementing them with a pair of RP-250F floor standers, a RP-250C center channel and a R-110SW (or R-112SW). The monitors will be the back speakers. Will the floor standers really improve music restitution in 2.0? What about music in 5.1, are the processing algorithms good (I am aware of this also being a subjective issue)? And more importantly, I think that this AVR is powerful enough for achieving moderate listening levels on the complete set, do you concur? Expected usage scenarios are music 70% and movies 30%. AVR specs: Power Output (8 ohm, 20 Hz - 20 kHz, 0.08% 2ch Drive) 70 W Power Output (6 ohm, 1 kHz, 0.7% 2ch Drive) 90 W Power Output (6 ohm, 1 kHz, 1% 1ch Drive) 130 W Cheers! Rami