I have a few questions about the Stryke disc Vol 1: 1. I have measured the 1KHz test tone at 75Db from 1 foot away. The level on my receiver ended up at -62Db (a Yamaha RX-V1200). -62Db is more than a 1/3rd of the way up on my receiver (scale = 0Db - -100Db). Should I use a lower volume level on my receiver for Stryke disc test tones? Does anybody know which tones are recorded at 0Db (full scale)? I really do not want to blow out a tweeter. 2. My primary purpose for using this disc is to take sub measurements from 15Hz to 100Hz from different positions in my room using the sine wave tones. How do I isolate the sub for best results? Should I disconnect all of my speakers except the sub? What is the recommended DSP for the receiver when taking measurements? The disc is not as straight forward as I had assumed and I just want to make sure I do not destroy my system. Thanks for everybody's input.