I managed to snag an ancient analogue RS SPL Meter (#33-2050) off of ebay for $6.50. Only problem was the shipping from the US (3 X the price of the item) that is now getting exorbitant. I got that model because from what I've read, it was generally the most accurate of the RS meter line.

I wanted to recheck the levels of my 800s with an actual meter instead of my previous phone app. I put it on a tripod with the front leg just touching the bottom of the cabinet (meter about 2' from the drivers) & ran the Denon AVR tones. My cheap phone app proved to be actually pretty good in that just the smallest adjustment was required to one of the sub's levels to match the other.

I moved the meter back to my MLP & played the tones through the other speakers & they all came in at around 73 Db with the subs being about 83/85 Db. So my Audyssey seems to be doing its job OK.

I played a Spyro Gyra SACD at my normal -15 Db level that gave me SPLs of 80 to 85 Db - fairly loud but comfortable...

TAM