My unconfirmed answer - 90-95 dB - louder after the 4th martini. "Confirmation" possibly not required - see below.
Over the years I've been a "good guesser" estimating "peak" SPL's on home audio systems.
WTH does that MEAN, Ghalt???
It MEANS, that, with relatively low dynamic range rock and R&B, I listen and second guess myself for a few minutes - then come out with a number. Then I turn on the once ubiquitous Radio Shack SPL meter - check the battery - flip the switches to "SLOW" and "C"
(slow needle ballistics, "C"-weighting)
and find that I'm usually within 1-2 dB of the needle at the top of it's swing - rarely off by 3db.
Alas, for some time my Rat Shack meter has been dead.
FWIW - I have recently "performed well" with a friend's less-vintage Rat Shack meter with an LED readout.