sorry this took so long guys.
as I said when I first got my whisper ( http://www.gatewaytoairguns.com/airguns/forums/thread-view.asp?tid=6567&mid=46758#M46758
), I wanted to make a dB comparison to my crosman 2100 classic pump.
first a quick disclaimer, I am a musician of twenty years (a drummer). I have soundproofed a few rooms in this time, and chose the longest room in my house with "some" dead ability (isolation of pellet stop noise, no "bouncy" walls). Sound variations WILL be different if you choose to buy a good meter and perform the same test, unless you have the same room measurements and same obstructions.
obstructions are anything a sound wave can bounce off: walls, a couch, etc. also it does matter how many openings you have in your room also, where the sound can escape.
here is the room I used:
the stick in the lower part is the rifle, and the roomis 11' wide and about 30' from tip of the rifle to the pellet trap face.
I used crosman premier hollow points in both rifles, 10 pumps on the crosman.
all measurements are taken in the same Z axis (this is VERY important). distance from B to C (Y distance) is approximately 19'.
each rifle got 5 shots for each location, and I have posted the averages of each rifle in each location.
I used a high quality (expensive) industrial OSHA approved dB meter I have had for some years. it records over a given time, and gives you the high and low points. in effect, each shot I took was also "averaged" out over its split second time duration, given its peak dB rating.
*please note this is a new gamo whisper, maybe fifty or so shots through it before the test, whereas the crosman is a seasoned rifle, about a year old, with 108 tree rat kills under its belt.
locations are marked for reference to the following numbers.
A: (trigger action)
whisper: 80.5 dB
2100: 77.6 dB
B: (five + feet left of muzzle)
whisper: 67.8 dB
crosman: 76.6 dB
C: (far left)
whisper: 66.3 dB
crosman: 75.4 dB
D: (far right)
whisper: 63.0 dB
crosman: 76.8 dB
E: (five feet + right of muzzle)
whisper: 60.4 dB
crosman: 78.0 dB
hopefully this information will be useful to everyone.
any questions, feel free to ask!