Level matching your speakers isn’t a topic that gets talked about much these days. With auto-calibration systems like Audyssey MultEQ, Yamaha’s YPAO, Anthem’s ARC, etc., it’s generally done for you.

How do manufacturers calibrate spirit levels? I have two spirit levels and one is way out. Can I recalibrate it? The way I was taught to use a spirit level was always to check the level twice, the ...