Thanks a lot for having taken the time to dig that up. Very interesting.
Then in the "deviation from linearity" section, again almost perfectly linear at 90dB, at 95dB a bit of compression in the upper bass (80-300Hz) and a teeny bit at high freqs, and at 100dB the deviation looks to be about 2-3dB low... so probably again some compression, so maybe there's something to it.
Yeah deviation from linearity *is* compression right? So compression begins to be noticeable at 100 dB, 2m on their tests.
Note however that these measurements are at 2m distance, so not nearfield, so you don't have to subract much to get to a standard 3-4m type listening distance.
Well, isn't it 6 dB @ 4m then? so compression would be noticeable at about 94 dB SPL at 4m.
In that context 95dB is REALLY loud especially for music -- it's likely that they can get to crazy loud music volumes before any strain shows.
That's for sure. But as you added, the question was, can speakers with aluminum dome tweeters reach (HT/movie listening) reference levels without compressing, and since transients can hit 105 dB SPL max, then it's likely the RC-70s would compress in the highs under those conditions; compression should be noticeable above -10 dB from ref (circa 95 dB SPL) at 4 m.
However these measurements were likely done in an anechoic room, so what about boundaries? I'm more familiar with subs now so I have no idea if reflections on surfaces (which are really echoes in the high frequencies) should be included in total level. They could add several dBs to the levels produced by the speakers.
I don't think it's controversial to say that they aren't the ideal choice if you are looking for dedicated HT speakers capable of easily hitting reference levels.
Ok well I don't listen at reference levels very often -- mostly during "demo nights" and only for short periods (not a whole movie). Regular movie watching occur at much lower levels due to kids sleeping
But I can potentially use this as an excuse for an upgrade, which is interesting. That will have to wait a few years though