Quote:
Originally Posted by
Outlaw Hans
But getting a perfect drumsound fom the o.h's with the right balance in toms, cymbals AND the snare dead centre is difficult and not all that necessary.
Actually I would argue that this is fairly simple and absolutely critical.
Now, the "mix" of the cymbals versus drums for oh's is largely in the hands of the performer. If they pitty-pat the drums and mash the cymbals... yeah, there's not too much you can do about that as far as the overheads are concerned.
However, getting the snare to sit in the center is very easy when you thinnk about the nature of stereo microphone techniques.
Stereo imaging is going to be determined by three factors:
1.)
Amplitude--obviously if the snare is louder to the right it's going to sound like it is coming from the right. Pan laws in consoles and DAW's adhere to this principle.
2.)
Time Arrival Differences -- Haas principle, if something arrives a few milliseconds earlier in one stereo side the sound feels like it is coming from that direction more, even if the volume on each side is equal.
3.)
Phase Correlation -- part of how we detect imaging is from phase cancellation differences in right to left, often caused by early secondary reflections in an ambient environment. This is one method that digital verbs can create "space" (early reflections--which causes #2, which in turn can cause #3 here). Stereo wideners *slightly* use a similar approach, although essentially they use phase reversal to eliminate "common factors" of the left and right side (destroying your "center channel" illusion if you push it too far).
Anyways.... achieving a solid stereo overhead is pretty easy if you apply the following rules:
1.) Same microphones on each side (pretty basic).
2.) Equal preamp gain on each side... this is how you know if one microphone needs to move because that side will be louder when you hit your "center instruments" like kick and snare. Also avoids getting slightly inconsistent sounds as many preamps 'color' sound depending on the where it's at during the gain stage. You want to keep that stuff consistent and transparent.
3.) Mics equal distance from center of snare--coupled with #2 your snare should be dead center of your image. Take into account height, distance and angle. Also, factor placement based on where sound reflections FROM THE KIT are going to be coming from. Also avoid getting too close to stuff like cymbals, that can produce low level ringy tones as the kit is being played.
4.) Mics also placed in a manner to capture the entire kit in stereo--there should be panning among the toms, ride, hat and cymbals... if not, time to adjust the mics.
5.) Check your overheads by having the drummer play the snare--adjust mics until it naturally falls in the center. Now have them hit everything in the kit one at a time. If you aren't satisfied with the volume/panning something needs to move--either a mic or the instrument itself.
This is the basic method that I use to set up overheads. The goal is to get a solid drum sound using only those two mics because things will only get better once the close mics and room mics get tossed in there.