I have a RadioShack SPL meter also.
Average SPL measurements at my listening position, 12 feet back from the center of the speakers is;
Enjoyable but loud listening levels: 93 to 96 db
If I turn it up (exceptionally loud): 105 to 108 db
These are average levels, without clipping and, as far as I can tell, without any audible distortion. Peaks are typically 10 db higher.
Note: I never listen continuously at an average of 105 to 108 db as it is uncomfortably loud and ears will ring afterwards.
Average SPL measurements at my listening position, 12 feet back from the center of the speakers is;
Enjoyable but loud listening levels: 93 to 96 db
If I turn it up (exceptionally loud): 105 to 108 db
These are average levels, without clipping and, as far as I can tell, without any audible distortion. Peaks are typically 10 db higher.
Note: I never listen continuously at an average of 105 to 108 db as it is uncomfortably loud and ears will ring afterwards.