That is my estimate, also. But it depends on what we mean by 'loud listening.' I have a big, tall room* to serve with symphonic, jazz, and solo instrumental music. I do have an SPL meter. For me, loud tends to mean about 105 dB at 1 meter. At my chair, at 4 meters, that's about 12 dB less, or about 92 dB. Peaks could go a little higher, particularly on fortissimo orchestra and percussion passages. I have 150 watts per channel available, and it is adequate but not at all excessive. Given the DBR's sensitivity, numbers predict a need for about 100 watts to make 106 dB @ 1 meter.
My ears tell me that the DBR62s are suffering compression at levels above about ~100 dB SPL at 1 meter. Regrettably, Amir didn't test for compression, that I can find. And once you've heard the effect of compression, you cannot 'unhear' it. The peaks go away before the distortion crushes the music.
The first amp I used to drive my DBRs was a Denon PMA600NE, rated at about 35/70 watts at 8/4 ohms. It very definitely wasn't enough in my large room. Definitely. (It has been repurposed in the bedroom.)
Thus a serious consideration with most value proposition speakers, including the DBRs: they seem designed for a medium-size room with average ceiling height. I am satisfied with them, but if someone likes really loud music, they are probably going to overdrive them. That's maybe fine for rock and metal, but not pleasant for classical and jazz.
(I tend to turn the volume down rather than invest in speakers approaching the cost of a good used Porsche.)
* My home is an 'open plan' with a large portion having an almost 5-meter high ceiling and open areas to other rooms.
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