Ok. Maybe I am going crazy but why am I having such a discrepancy when I calibrate my speakers with the Digital Video Essentals DVD vs the test tones on my Sherwood P-965? I am using a Radio Shack SPL meter and the difference is not small.

For example, with the DVE disc my RF channel is set to -2 and with the internal 965 tones it is set to +2. This is all with the 965 set to 00db and achieving a 75 on the meter with it weighted at C, slow. Which one is the right one?