![]() A Klipsch loudspeaker was positioned in a semi-anechoic test room such that it simulated a center-channel configuration in a typical theater setup. Testing of the AT1200/AT Grey acoustically transparent material was performed by engineers at Auralex Acoustics in Indianapolis, IN in November of 2005. These results are valid for third-octave bands between 100 and 20,000 Hz.Īcoustically Transparent AT1200/AT Grey Test Procedure ![]() and summarizes the average and maximum screen insertion loss (IL) for each screen sample, as well as the band in which the maximum IL occurred. The ability to use identical speakers due to space restrictions and avoids interference with other objects on the floor or ceiling.įigures 1 & 2 and Table 1 show the third-octave band insertion loss results in detail from 100 through 20,000 Hz. Movie Theatre quality that is true to the original sound mixing engineering Quality sound localization for the dialogues and overall sound effects The ideal position for the main speaker is behind the screen on the same level as the right and left speakers. I'm just guessing ya need to capture 5 or 10 milliseconds containing around 200 samples with equipment capable of 100kHz to get meaningful results.When installing a home theatre system, the proper set up for the sound system ensures the highest quality results. I don't know about the ability to evaluate the sound with software/sound processors. You also need equipment that will survive the blast. You may be catching the down slope of the curve with a slow meter. Otherwise, you are just measuring some unknown part of the curve. 50 microseconds (not milliseconds) or less is necessary to insure that you catch the peak. Many people think a significantly louder shot is quieter if it's tone is more pleasing.īack to the original topic - The primary factor in measuring the gunshot is the response time of the equipment. Just like with home audio, not everyone hears the same thing. Once you put the meter away and ask for loudness opinions, things change a lot. People standing behind the shooter would experience even quieter sound. It also would be quieter if measured at the shooters ear instead of at the end of the barrel. The numbers I quoted would change with ammo selected and barrel length. The SPL's are routinely reproduced within a few dB's by other professional testers, so they are pretty accurate for a specific gun/ammo combination. This type of sound is unlike any other sound you may have SPL experience with. Of course, I could be making all this up. This particular test resulted in the following SPLs using CCI Standard Velocity ammo. The meter and weapon are also placed in accordance with Mil-Std 1474D protocol." All equipment has been certified and tested so that it can be traced back to the N.I.S.T standards. ".The tests were conducted using the B&K 2209 sound meter with a B&K 4136 microphone calibrated with the B&K 4220 Pistonphone. Here's part of the testing protocol used: Since you have trouble "accepting someone's word", you will need to do some work on your own.īTW, I went over to Silencer Research and looked at some of the testing. I did this to inform the OP, not to open a debate about something that is really not debatable. I quoted 2 specific weapons, the ammo used, the testing protocols used and the resulting SPL. You are welcome to your opinion, but it is in opposition to repeatable, verifiable, scientific testing. Not only that, you don't seem willing to stop long enough to get the facts.ĭid you look at the testing at Silencer Research? I guess not. That's rude and why there is so much bad info on the net. You don't appear to know enough about the subject to look it up. You are causing confusion and posting misinformation. No, what you did was hijack the thread and question me and my information without a clue as to what is correct.
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