What are your experiences with either/both of these calibrations discs, especially in useablity and ease of use. The reviews on Amazon, for instance make the DVE seem like a nightmare to use/navigate and with little to no instruction of what to do with the tests it runs, whereas, the reviews for Avia seem more glowing for the most part. I just don't want to buy a disc and have it become a nightmare because it's impossible to use or where there's no explanation of what to do with these tests. I have a CRT, so I'm mostly concerned about the audio tests. And then, thinking in terms of common sense (or maybe my lack thereof), what is the point of having multiple audio tests. If you calibrate the levels of your speakers' output accordingly to one test tone and then another test tone shows them outta wack, then what? you recalibrate for that particular test. Multiple tests, on the face of it, don't make much sense to me.

Secondly, and related, I got an SPL meter today. I used the THX optimizer test tone on a THX DVD (hence why I want a calibration disc) and I proceeded to calibrate the 5 channels through the digital output. And I was pretty happy with the outcome. Now, when I switched to the 6-channel output (which I use for DVD-Audio), I got completely different readings. For instance, the rears were much louder than with the digital output readigs. What's up with that? I have a Yamaha RX-V3300, if that makes a difference.

Thanks for your insights.