Dave Dahl
Stunt Coordinator
- Joined
- Jun 30, 1997
- Messages
- 138
Hi all,
I was messing around with a computer based spectrum analyzer with a radio shack SPL meter hooked into it. I have discovered that from 20Hz to 4KHz everything was, while not completely flat, what I had expected. What I did not expect is that starting at 3.5KHz to 4KHz there is a 20dB drop in output. From there to 20KHz it is reasonably flat.
What on earth can be causing a fourfold decrease in volume above 4KHz? My room is rectangular with dimensions of 251" long and 176" wide. I have a drop ceiling and have arranged my speakers using the standard Cardas method.
While I know the subwoofer cannot be to blame I performed the test with and without it. I also have bookcases with staggered books at the the early reflection points. I have performed the measurements with and without them only to get the same result.
This is driving me a bit crazy. Any ideas...
Thanks!
Dave
I was messing around with a computer based spectrum analyzer with a radio shack SPL meter hooked into it. I have discovered that from 20Hz to 4KHz everything was, while not completely flat, what I had expected. What I did not expect is that starting at 3.5KHz to 4KHz there is a 20dB drop in output. From there to 20KHz it is reasonably flat.
What on earth can be causing a fourfold decrease in volume above 4KHz? My room is rectangular with dimensions of 251" long and 176" wide. I have a drop ceiling and have arranged my speakers using the standard Cardas method.
While I know the subwoofer cannot be to blame I performed the test with and without it. I also have bookcases with staggered books at the the early reflection points. I have performed the measurements with and without them only to get the same result.
This is driving me a bit crazy. Any ideas...
Thanks!
Dave