Good point on DVE Alan as the tone is regarded as 10db too low when setting at 75db. I use other calibration discs and tones but DVE is widespread. I should have added if using DVE make the 10db adjustment or you will have the sub gain below the other speakers. Alternatively just use Avia. I don't recommend using a single tone because of possible problems with nodes depending on where the RS metre is place. Sweeps are better then just set at the average reading. Also I wouldn't bother with the calibration posted above until you've solved your bigger problem with the inadequate mains.
