With the purchase of my $120 Sony SA-WM40 from my.sony.com (thanks for the heads up!), I decided to calibrate my system this weekend before I watched AOTC. I have a set of Cerwin Vega HT speakers from the early/mid 90s. My receiver is a Sony STR-DE935. After a long friday night of driving around town, I found the Avia disc and purchased a RS SPL meter. I calibrated my system without any problems thanks to a few hours of research on this great forum. A big thanks to Vince Maskeeper! So, my question is this: I currently have a piece of masking tape secured to the perimeter around my volume knob. I have then, with a Sharpie, marked reference on this piece of tape. How does everyone mark reference on their recievers? Surely not a gawdy piece of tape. I know some receivers have hash marks around the edge of the volume knob. Mine does not! Wouldn't it be nice if these companies would design a rotating plastic ring around the perimeter of the volume knob. This ring would have a hash mark on it with "00" or "ref" stamped into it. You would then be able to calibrate your system and then rotate the ring's mark to line up with your reference.