I have a DVE Blu-Ray disc, I'll check it out tonight.
Just using the test tone in the receiver I only get a 2 db swing, but I guess that's only at whatever frequency the test tone is at.
If you don't find the bass sweep on DVE, it may be the Avia disc. I have too many calibration discs--basically every one I've ever heard of I've bought.
The test tone from the receiver is broadband noise, it covers the entire range reproduced by the sub. Without a real-time audio spectrum analyzer you wouldn't know if one part of the spectrum is accentuated or attenuated over others. But a sweep will play one frequency at a time, so you can hear how the room responds to each.
