Re: Help with tuning and resonance. You need a lesson in "The Physics of a Drum Sound"
Two things happen when you hit a drum.
1.) The air in the drum is displaced downward until it bounces off the resonant head.
2.) Energy is transferred to the shell of the drum in the form of a vibration, which travels down the shell in a spiral fashion until it reaches the other end, and returns.
What you want, if for the shells circular vibrations, and the mass of displaced air, to arrive at the other end of the shell and bounce back, simultaneously. IF the velocity of the displaced air and the shell's vibration ARE the same, the drum will resonate. This is called being "In Tune". If they're not, it will ring. Ringing is merely a multitude of unstable sonic vibrations, running around crashing into each other. This is a result of "Conflicting Vibrations". Sometimes you may notice a different drum is ringing. This is referred to as "Sympathetic Vibrations". You'll need to check the other drum also, to find the culprit. When a drum is "In tune" It's mass of air is displaced at the same velocity at the shell vibration, and they travel in unison down and back, creating (you guessed it) "Complimentary Vibration" and resulting in a clean note followed by a smooth, resonant tone.
It's important to note that drum tuning is FAR more dependent on the resonant head, than the batter head. But, you are dealing with vibrations, so you want be careful not to contribute extraneous energy into the process by over-tightening a head. That effectively stores excess energy in the head, and will increase the velocity of the shell vibration upon energy transfer. (Striking the head). Not what you want, because the vibration will reach the other side before the air mass.
Try this:
Tighten your batter side head just tight enough to get the stick response you're looking for. Tighten evenly thought. If you aren't sure, do this: Place the drum on a flat surface. Press down in the center of the head with you fingers, fairly hard. Use the heel of your hand for drums 14" or larger. While you're pressing down, look for wrinkles in the head. if you don't see any, it's probably too tight. Loosen all the lugs until you see wrinkles. Still pressing down, tighten the lugs, in an alternating pattern until the wrinkles are gone. Turn the drum over, do the same thing. This gets you pretty close most of the time. Remount the drum. Test the tension for decent stick response, if it's too loose, you can tighten it up (a little bit), but it should feel pretty good. Then start tuning the drum. At this point, you should ONLY be adjusting your RESONANT head in search of the sound you’re looking for. 90% of your tone is dependent on your bottom head. Once more, in case you missed it: 90% of your tone is dependent on your bottom head. Leave the batter side alone. This method is going to come closest to producing a tone "complimentary" to the drum itself. Each shell has a way it wants to sound. If you’re really adventurous, remove both heads balance the shell from inside the drum, where it’s resting on just one or two fingers, being careful not to touch it anywhere else. Then, strike the outside of the shell (not real hard) with a Felt Mallet., You don’t want to hear the impact, just the resulting tone. That tone is your drums “Timbre”, and if you can tune it to that note, that’s your drum’s natural voice.
There are other ways to approach it to get whatever sound you want. This is only a suggestion. I think it's important you become proficient with these concepts before straying too far, though. Experiment with the tuning range of the drum via the resonant head. Remember, it's all about "Sonic Vibration" as is all music. Your drums should resonate with a pleasant tone, but not ring or sound like cardboard. Hydraulic, EC-2, and to a degree even Pinstripes, just eliminate vibrations. You need to utilize these vibrations, not eliminate them. E-rings, O-rings, Moon-gels, Gorilla Snot, Ring Arrestors, Duct Tape, and all of those types of heads, are made to eliminate vibrations, and marketed to people that cant tune their drums. You can use all that crap to keep your drums from sounding awful, but you won't ever be able to get them to sounding good that way, either. Also, it’s just lazy.
Drum tuning is an Art-form unto itself. Like any Art, to master it demands practice, effort, focus, and diligence in the desire to achieve perfection.
Put down the Duct Tape... And go practice... Good Luck... Hope this helps! |