[SIZE="4"]ADDENDUM[/SIZE]:
After I had my little epiphany with the tuning apps and happily rode into the sunset feeling I had finally mastered the fine art of drum tuning I hit a wall and everything seemed to stop working (ain’t it always the case?) :D. For a couple of “tuning sessions” my 2 phone tuning apps seemed to go berserk and give frequency readings all over the place, making it impossible to tune the drums. And when one head seemed to finally be in tune, the opposite head would start acting up and it was back to square one. Imagine my disappointment.
So I did some research online and figured out what was happening. After finally getting it right, I thought I’d come back here and give those of you still interested a (final?) update on the whole process.
Things I found out in the last week (some are very basic, but bear with me):
1) The note that an outside listener perceives when you hit a tom (what they call the “fundamental note” of that drum) is actually a combination of the tension of both the batter and resonant heads. Therefore, if you want to tune a tom to produce a “G”, you *don’t* tune the batter to a G and the reso to whatever note you feel will give you the resonance you need (more tension –> less resonance), like I used to think. There are actually several (infinite?) possible combinations of batter-reso tensions that all produce the fundamental note “G” (with varying degrees of resonance), so you either have to calculate what those tensions need to be or simply use the tables in the “tunebottuningguide.pdf” document (pag. 3-4) to choose your head tensions according to the resonance you want to achieve.
2) When you hit a drum head in the center with a normal force, you’re actually hearing a bunch of frequencies at the same time: the frequency at the center of the head, the frequencies right next to each lug, plus all the frequencies of the opposite drum head! This is what drives tune-bots and tuning apps crazy and makes it hell to know what is what. I found an excellent video by Geoff Fry that explains how all this works and how to get the tune-bot/phone app to give you consistent readings. If you have 10 minutes, you should definitely check it out; it will save you a world of frustration:
[ame]http://www.youtube.com/watch?v=2BRTblC8Odc[/ame]
There’s another video where he experiments with head tunings to achieve different sounds that is also very interesting:
[ame]http://www.youtube.com/watch?v=i21zCMwUSWw[/ame]
3) OK, let’s go to the actual process:
* (Skip this step if you’re using a tune-bot instead of a phone app) If you’re using a mobile app to tune, get a phone holder with a suction cup (see attached picture, they cost less than 10 bucks). You can attach the holder with the phone to the edge of a (smooth) table and sit the tom on a chair right next to the table, with the upper head sitting a couple of inches below the phone (see the other picture for a similar setup). This way, the phone is fixed and you only have to turn the tom around so that the lug you’re working on is closest to the phone’s mic. This also frees your hands and makes the process quite a bit faster and more comfortable.
* Again, you want to tune each head independently from the other, so you need to stop that opposite head from vibrating. The easiest way to do that is to get a big soft cushion (a pillow would do, I guess) and sit the drum on it. This will totally muffle the bottom head and eliminate all those frequencies from the readings.
* Place a small piece of “moon gel” (less than a 1/2 inch square in size) on the center of the head. This will dampen the “center frequency” and let you concentrate on the lug frequencies (remember, the tuning tables in the Tune-bot PDF document refer to lug frequencies, not the center one). Note: if you don’t have moon gel, you can get a cheap substitute in stores where they sell those rubbery decorations people stick to their windows for Christmas/Halloween. You can get all the gel you will ever need for about a buck :-D.
* Now we’re ready to start tuning. Start from scratch, completely loosening all the lugs. Then tighten them with your fingers, two at a time (each hand on an opposite lug) to give them a uniform (low) tension – what they call “finger tight”. From that point on, tighten each lug in a star pattern in SMALL increments (the first adjustment after the finger tightening can be a quarter key turn, but after that you should use smaller turns). Tap the head with your finger after each adjustment to check that the lug regions all sound the same (even if you don’t know their actual note/frequency). Do this until you are approaching the desired pitch. After that, start using the tune-bot/mobile app to read the frequency at each lug and, hopefully, you will have no problem getting a consistent read on that value (which, again, is the biggest issue with this kind of tuning). If you keep getting all sorts of readings as you check the lug frequency, the causes are probably: you’re hitting the head too hard / the opposite head is not properly muffled / one or more of your lugs are too tight/loose and are producing a different frequency. If you get stuck with those crazy, seemingly random readings, loosen all the lugs and start the process again.
* After you achieve the desired lug frequencies and the head sounds the same close to all the lugs (i.e., it is “in tune with itself”), you can flip the drum and do the same for the opposite head. After that, remove all the muffling, hold your tom in the air with a couple of fingers and hit it normally. You will hear a great, ringing note that, as if by magic, corresponds to the pitch you were aiming for :-D. And if it’s not quite there, you can still do a final, fine adjustment using the best pitch detection device you’ll ever possess: your ears :-D
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Hopefully, you’re done, and can concentrate on what’s important, that is, playing your freaking drums!!
In case you’re curious, I ended up tuning my drum set using the “medium resonance” table from the document (the values aren’t exactly what I got, but they were surprisingly close. Also, I tuned my 13” tom to the values they give for a 14” and it sounds great):
10” tom: Fundamental note: 3D // Top lug freq.: 206 // Bottom lug freq: 294
12” tom: Fundamental note: 2B // Top lug freq.: 174 // Bottom lug freq: 248
13” tom: Fundamental note: 2G // Top lug freq.: 137 // Bottom lug freq: 196
16” floor tom: Fundamental note: 2D // Top lug freq.: 103 // Bottom lug freq: 147
It only took me (three weeks and) two hours :-D
Thanks again for the help.
Best wishes,
Alex