"Without bias"? You mean like without the sort of bias Ian is demonstrating, where the sound of the shot is dramatically louder than the sound of the brass on the grass or the bullets hitting the berm? He's listening for those things, unconsciously filtering out the sound of the firearm itself, much as musicians do routinely when playing in large ensembles, or as one does when having a conversation with someone in a noisy club - it is essentially that we are able to focus our hearing, to discriminate between different sounds and find the ones which have meaning for us. In this case it is meaningful, of course, that one can in fact hear those other noises... but please don't forget that the MP5SD has never been reported as emitting less sound pressure than 125dB, even with the quietest of subsonic loads. And 125dB is loud. Just not as loud as the firearm would be if fired without the suppressor mounted, which would be well in excess of 155dB, territory where hearing damage can happen with a single shot fired.
Exact use of language becomes important in technical matters. More so in a case like this, where not only subjective hearing, but also legal elements and propaganda by highly motivated parties becomes involved. If you casually say that an MP5SD shooting subsonics is 'silent' then you can count on that sort of statement being used to further justify banning of suppressors. They'll just throw it on the heap of out of context, manipulated, and otherwise contorted information. A suppressed 9mm firearm with a good suppressor on it, shooting subsonic ammunition, is indeed a lot quieter than a legal, unsuppressed Canadian firearm shooting the same ammunition. But it is far, FAR from silent.
You misquote Ian and me. You completely miss that the ammo need not be subsonic in the SD. Ya language is important.
Did Ian alter the sound effects to make his video?? Is he dishonest?
Suppressor 's were banned in Canada because of
The various Provincial Hunting Acts during the 1920's
On a personal basis I want to hear the trespassing pricks if they take a chance on hunting my place illegally. Lazy sneaky poacher pricks. Too lazy to use bows. Usually.