Yes, the 20 hz assumption looks to make more sense.
I really don't see how. Remember, a 20 Hz LFX frequency means -6 dB at 20 Hz, not flat down to 20 Hz. Why choose this figure? Just because it's a nice round multiple of 10? This is much more arbitrary in my eyes than an LFX point of 14.5 Hz which, as I said in this post allows for flat response down to 20 Hz for most ported and sealed subs (only 0.5 Hz out for the latter with a ~12 dB per octave bass roll-off), covering all frequencies in music for an ideal response, which was part of the original intention of the w/sub score (and why I've previously suggested it should be named 'score w/ ideal sub' to avoid confusion). And yes, the actual listener preference ratings were given out of 10, so I don't see how it makes any sense for the maximum theoretical score to be less than 10 for the predicted ratings.
Having said all this, I do think @edechamps ' brilliant Loudspeaker Explorer having the option to choose the LFX frequency for the score calculation is very useful, as you can then just set it to your sub's actual LFX frequency for a personalised score (leaving the 'official' w/ sub score as the 'maximum potential score' you could get with an ideal sub, not necessarily the one you currently have). I just wish the Loudspeaker Explorer's LFX slider went lower than 20 Hz As @MZKM and others have linked to, there are definitely subs out there with lower LFX frequencies than 20 Hz, at not unreasonable prices either.
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