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I recently went to two dbdrags on two concurent days, one saturday night and then again sunday day. They were put on by the same people using Audio Controle Meaters. Saturday night i was hitting 147.8. then sunday with no change in setup I was down to 145.0 . The only thing that i can think of that changed was the temp. and humidity. people also travaling with me and competing had a SPL drop of about 2 to 3 db also. Dose temp and humidity effect the meaters and /or something in the car to cause a drop in SPL? PS (sorry i cant spell werth Crap thats what spellcheck was made)
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Posts: 7 | From: Sedalia, Mo USA | Registered: Jul 1999
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posted
Temperature and humidity both affect the way your system performs. Try this: the next time you compete in hot and humid conditions, try playing a note 1 to 2 hertz higher than your standard frequency.
------------------ "Keep it Loud and Make me Proud!"
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i usualy use a 45 Hrz tone but my box is tuned to 31 hrz. so i should use a 33 or 34 hrz. or a 47/48. Even tough it is tuned to 31 hrz is it normal to have the most SPL at a diffrent Hrz. then what its tuned to? Also my problem is that my box is in the trunk of a 95 sebring (we fiberglassed the spare tire well in and ported two DVC 15's) firing up. we tried making a top (three sides and a top) to try to force the air into the cab with the seats down but that didn't seam to help me brake into any thing over 148 any other sugestions? I've had the sugestions of adding an epacenter and change to Power DVC's any others. Im using Two Crossfire 1000D's bridged together. running the dvc's at 1 ohm.
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Posts: 7 | From: Sedalia, Mo USA | Registered: Jul 1999
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Yes it is very typical for the loudest frequency in a ported system to be 1/2 octave above the tuning frequency, or in your case around 46/47 Hz.
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And that's the bottom line, cuz: LORD DUKK SAYS SO!
The Big Show The Dukk says: Know your bass: PORT your damn box!! Have HoleSaw, Will Travel!
posted
Another thing that might explain the 2-3dB drop between that night and the next day is this.....Audio Control. The Audio Control meter has a sensitivity knob with a -10dB to +10dB range. It's supposed to be set at 0 for SPL but I've seen contests that were intentionally 'thrown' for someone simply by turning that knob. If the person setting it up the next day moved it from it's position the previous night, all scores that day would be affected.
Steve
Posts: 219 | From: Monroe,NC USA | Registered: May 1999
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so would keeping the air on and the car running while im not competing help me once i got to the lane.or is it the temp. of the mic and the meater im worried about?
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Posts: 7 | From: Sedalia, Mo USA | Registered: Jul 1999
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posted
I think that you shouldn't compare your SPL scores from day to day, it just gets confusing! There are soooo many factors, everything mentioned here plus many more. Example : if you played your system more one day then the other your voltage could have been lower or your voice coils could have been heated up which raises the overall impedance. Another possibility is that usually one lane reads higher than the other (although not intentionally) because many shops don't realize that when you calibrate the meters at say 140dB the further away from 140 you get, the further off the calibration is!!! In conclusion, go to the shows, compete, have fun, and be happy!!!and if you don't win, remember there is always a next show...
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