Yes, use the receiver test tones and set them all to the same volume. To get a good reading, I suggest calibrating to 75dB. This will be the "0" or "reference level" on your receiver. Depending on your receiver, this could be where the dial reads "0," or "75," or "50" or wherever.
With a Radio Shack digital SPL meter, you can set it to 70dB or 80dB to get readings for 75dB. You could also consider calibrating to 70dB, which would be your "-5 / 5 below reference level" point. SPL meters are the most accurate at the point they are set to (ie., 70dB) and are good to about +/- 5dB from that. This would make sure the readings around 70dB would be more accurate.
With a Radio Shack digital SPL meter, you can set it to 70dB or 80dB to get readings for 75dB. You could also consider calibrating to 70dB, which would be your "-5 / 5 below reference level" point. SPL meters are the most accurate at the point they are set to (ie., 70dB) and are good to about +/- 5dB from that. This would make sure the readings around 70dB would be more accurate.
























