3-to-1, x-y mic technics; BMP and delay formulas

  • Thread starter Thread starter Proveras
  • Start date Start date
You'll have to use your ears and check out different options.
Try both of your set ups.
I I had only 4 inputs like you have on your delta, I would close mic the Kick and the Snare and use 2 condensors like an "X-Y" as overheads for a good stereo image. You'll get enough leakage from the toms in the snare mic and overheads. I'm not a big fan of micing cymbals by them self. I do think that
you'll get a blended more natural sound with overheads high above the kit about 3 feet.

If you want to bring out the cymbals then roll off the lows under 150Hz and boost the highs around 10-15kHz on the overheads.
Pan the X-Y right-left hard and if you feel that the stereo image needs to widen up then make a larger opening between the mics.

As for mics well... thats a money issue. try for at least 2 good condensors.
Good Luck
 
ok.

bruce, shailat, thank you very much.
I will print all the info. I was worry when yesterday I cant see the treath.

mmm, do you know some more interesting and practical formulas like the delay-bpm one?
just for study and know them. :D
 
Here are some simple formulas:

t = d/c where t = time in seconds, d = distance in feet, and c = 1130 feet per second.
t is the time it takes sound to travel that distance, say, the distance between two mics, or the distance from a stage to a point in the audience.

w = c/f where w = wavelength in feet, c = 1130 feet per second, and f = frequency in Hz.
w is the wavelength of a sound wave at a certain frequency.

e = i * r where e = voltage in volts, i = current in amperes, and r = resistance in ohms.
Ohm's law. Use it to answer all sorts of questions, like how much will phantom voltage drop if you plug in a mic with 6 mA current drain, and the phantom resistors are 6.8 kilohms?

Adding two equal impedances in series
Z total = Z1 + Z2

Adding two equal impedances in parallel
Z total = 1/2 (Z1)

Unbalanced pad or voltage divider
Loss in dB = 20 log (R load/(R load + R series))

Converting volts to dBV:
dBV = 20 log V

Converting voltage change to dB:
dB = 20 log V1/V2. If you double the voltage, the level goes up 6 dB.

Converting power change to dB:
dB = 10 log P1/P2. If you double the power, the level goes up 3 dB.
 
3-to-1 and onware

Get out of my head y'all!
Thanks so much for articulating what a I see/hear every day.
This thread speaks directly to what I contemplate every time I walk through the main (drum) room here. I never will cease to be filled with wonder of how powerful the effect of moving one mike three degrees towards the back wall can have on the ENTIRE sound of a kit/room and therefore the rest of the project at hand.
3:1 works well for me as a general rule, kind of like walking heel-to-toe to measure a space, but the complexities of a traveling sound with all of its attendent overtones make it sometimes overwhelming to my ears. Your insights are greatly appreciated and soon I will have my own to toss on the fire.
 
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