digitalfrost
Major Contributor
Okay. So I control the complete digital chain, and I can see digital signal levels before they leave for the DAC. Since I use Topping D50, I also know the volume there, and we know that it outputs 2V RMS at full scale.Here is a decent SPL calculator:
https://myhometheater.homestead.com/splcalculator.html
My test track is Westernhagen - Mit 18:
Dynamic range meter for foobar2000 quotes DR8, here's iZotope RX:
Waveform:
And here's TotalMix, showing a level of ~ -5dB at peaks:
I have the Topping D50 set up at -7dB for the satellites, so in total we're down -13dB already. If my calculations are correct, that means the D50 is only outputting ~ 0.44v into the Benchmark AHB2. We know the gain in the high setting is 23dB and it would produce 100W into 8 ohms at 2V. But since we only have 0.44v and this is a linear relationship (right?) I would assume max power is actually only 22W, with the amp outputting 6.21V. Is that correct?
My SPL meter set to slow and C weighting at the listening position is showing 107dB max hold. Mind you, the subs have their own amp and I cross over at 100hz. Also, I'm not using KEF LS50 as you would guess from the TotalMix screenshot but ER18DXT at the moment.
e: The calculator gives 80dB sensitivity for 22W at the distance when placed in a corner/near a wall. It fits. So there you have it. All I need is 22W
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