Kirk Mango
Stunt Coordinator
- Joined
- Jul 8, 2002
- Messages
- 88
Well, finally figured out how to use my notch filter on the B&K Ref 30. I ended up notching the frequency at 46hz around -6.5dB, with a width of say 38.8hz-52.3hz. With very ineresting results. Here are my measurements at each hz level without the correction factors added in. These are the numbers right off the meter. First set is the hz, second set is the original numbers, the third is after the notch filter has been set. Remember I am only using a -42dB test tone from my preamp for these readings.
HZDB LvlDB w/notch
206262
226565
247071
267069
287271
307170
327069
347069
367169
387269
407672
427974
447973
468074
487974
507672
527471
547572
567472
587573
607675
627676
647877
667876
687676
707575
727575
747575
767574
787372
807070
826868
846666
866465
886564
906563
It was interesting to find that the notch filter not only had an effect on the hz fange I set it at but also a more subtle effect in many other areas of the hz range. Anyone know why that is? Wayne?
As far as the soound went I noticed a smoother cleaner bass response with music and movies. For example, when I played the scene from matrix where Kiano Reeves walks into the building with all the guns and open hands the gaurd in the chest through to where they are on the rooftop, I noticed more musical bass tones. Same held true with several music CD's I am familiar with. The difference was not huge but it was evident. Also noticed a loss of some bass frequency when the Agents bullets passed by Kiano on the rooftop as he bent backwards. Another interesting note is that even though some things sounded the same there was a drop in SPL. Example, I used to get around 99 dB in the scene from ATOC during the ship fly by at the beginning (The 3rd one coming through the clouds)when I set my peamp to -15 below reference. This same scend now regesters about 97dB. the scene felt and sounded the same but did not register the same SPL. Interesting. I should also note that on some scenes like the fight scene in Matrix between Orfeus and Kiano where Orfeus jumps in the air and his knee crunches through the floor I felt and heard the distinct shock of the crunch but then an after shock that was more felt then heard. Kind of delayed. It was not huge but definately there. Also, In the Ice field scene from Titan A&E there is one part about in the middle of the scene, or first 3rd of the scene, where there is very little sound heard but a definate feeling of pressure in the room as the Ice pieces collide and crunch together. Of course there is a lot of low bass all through this scene along with mid and higher tones accompanying the low tones, however, there is that one area where the room just kind of feels pressurized with very little middle and high tones. Weird. Never noticed any of this before. Well, anyone have any thoughts on this, Wayne chime in.
KM
HZDB LvlDB w/notch
206262
226565
247071
267069
287271
307170
327069
347069
367169
387269
407672
427974
447973
468074
487974
507672
527471
547572
567472
587573
607675
627676
647877
667876
687676
707575
727575
747575
767574
787372
807070
826868
846666
866465
886564
906563
It was interesting to find that the notch filter not only had an effect on the hz fange I set it at but also a more subtle effect in many other areas of the hz range. Anyone know why that is? Wayne?
As far as the soound went I noticed a smoother cleaner bass response with music and movies. For example, when I played the scene from matrix where Kiano Reeves walks into the building with all the guns and open hands the gaurd in the chest through to where they are on the rooftop, I noticed more musical bass tones. Same held true with several music CD's I am familiar with. The difference was not huge but it was evident. Also noticed a loss of some bass frequency when the Agents bullets passed by Kiano on the rooftop as he bent backwards. Another interesting note is that even though some things sounded the same there was a drop in SPL. Example, I used to get around 99 dB in the scene from ATOC during the ship fly by at the beginning (The 3rd one coming through the clouds)when I set my peamp to -15 below reference. This same scend now regesters about 97dB. the scene felt and sounded the same but did not register the same SPL. Interesting. I should also note that on some scenes like the fight scene in Matrix between Orfeus and Kiano where Orfeus jumps in the air and his knee crunches through the floor I felt and heard the distinct shock of the crunch but then an after shock that was more felt then heard. Kind of delayed. It was not huge but definately there. Also, In the Ice field scene from Titan A&E there is one part about in the middle of the scene, or first 3rd of the scene, where there is very little sound heard but a definate feeling of pressure in the room as the Ice pieces collide and crunch together. Of course there is a lot of low bass all through this scene along with mid and higher tones accompanying the low tones, however, there is that one area where the room just kind of feels pressurized with very little middle and high tones. Weird. Never noticed any of this before. Well, anyone have any thoughts on this, Wayne chime in.
KM