51

If you look closely at the picture, you'll notice that pieces of tape are placed in very specific positions: one in the middle of speaker cone and the second one on the edge of speaker cone. Furthermore, look at where microphone is positioned - it directly aims the piece of tape. This technique is commonly used in recording - tape is used to mark microphone ...


19

Because of dynamics called room modes. Room modes are the collection of resonances that exist in a room when the room is excited by an acoustic source such as a loudspeaker. (...) each frequency being related to one or more of the room's dimension's or a divisor thereof. To keep things simple, we will assume the room has 6 parallel walls (right prism or ...


12

Sadly I think this may be a duplicate of the question Altering the sound of a guitar to match a sitar. But before this question is closed as a duplicate I want to nip in with an answer I just got over email from Helmut Most people think that the sound is created by the sympathetic strings, but it isn't. It's the bridge, a wide, slightly curved piece ...


11

You play an E note hammering to F♯. When you play E on the G string, it makes the low E string vibrate in sympathy. That continues to vibrate and while the F♯ is sounding, it sets up beats with that low E, which actually is vibrating at its harmonic. The sound you hear is the result of the two vibrations simultaneously. By muting the lower strings, you stop ...


10

JCPedroza's answer is correct for a square room, but I think it's worth pointing out that the shape of the room is not just it's dimensions. For example, a square room with an open window will act different than if the window is shut. In acoustics, we often model the response of a room as a circuit. If you break up the space into pieces, each piece can be ...


9

user65726's answer has some of the basics, but to expand on that a bit: The question asks for two things, which do not necessarily always come together: "musical stable pitches" and "harmonics." First a little background. To be clear, harmonics are not necessarily the same as overtones. A harmonic is an overtone which is an integer multiple of a ...


9

Not really. Most of the resonance in a digital piano is "faked" - that doesn't mean it can't be good, just that it doesn't rely on actual cabinet resonance to make it sound "real". Some pianos have really complex algorithms to make up this virtual space; others don't. A lot of this is dependant on price point. Three grand ought to be ...


8

We call this sympathetic resonance and it happens when two strings are related via harmonics. This is made especially obvious when we consider the harmonic series: Begin by pushing down the G right above middle C without having it sound. Then put down the sustain pedal and play middle C; you may hear an upper pitch, which we'll talk about soon. Now try ...


8

I'm going to post a counter-opinion and say it does matter. Not because that fake structure makes any difference to the sound of the piano - it doesn't. But... We do not need it to be mobile I'm not sure that's necessarily a good call. If your young student is going to grow up and might want to take the piano with them, a digital piano with all the fake ...


6

Open strings always sound different to fretted notes - more resonant and with more sustain. Players of string instruments learn to avoid open strings for that reason, and sometimes to take advantage of the different tone of an open string. Other than that, it does seem that you've identified a resonant frequency in the body of your guitar. That is probably ...


6

I'm not sure if it's a correct board to post this question, but anyway... "Mud" usually refers to too much low frequencies and/or too scarce high frequencies. You should correct it per instrument + sometimes in whole mix with equalizer. Resonances are hums on certain frequencies than can be caused by different reasons. For example when you record acoustic ...


5

Based on what you've given us to go on, the instrument with the resonant frequency of this cave you visit would be an identical cave. :-) Before you start thinking about instruments, materials, or tuning, you need some ballpark as to what this resonant frequency actually is. The most reliable way to determine this would be to bring a tone generator (like a ...


5

To a reasonable approximation the overtones of the vibrating strings used in musical instruments are integer multiples of the fundamental. In a tablular format similar to the OP: 1.0, 2.0, 3.0, 4.0 ... These correspond to the string modes: The relative amplitudes of the degree to which these modes are excited depends on the details of how the string is ...


5

Your basic problem is that you have a sound source in one corner of what looks like a box-shaped room. That in itself will boost the sound output at low frequencies, by reflecting the sound coming from the back of the instrument into the room. If the organ amplifier has some type of "tone control" or "equalizer," simply reducing the bass response may fix ...


5

Your ear could be off. Even though the dim 5th is NOT an overtone of any vibrational frequency based on the standard accepted model of a string, there are a couple things that could cause this. The response of the other strings to an input is not an ideal response right at resonance. All naturally occurring system have damping and this broadens the ...


5

If the space is just a void, then as per Tetsujin's answer, there's unlikely to be a major benefit to it. However, some pianos with the same form-factor as a small upright piano will have speaker systems with some drivers in the body of the instrument below the keyboard - Pictured below as just one example is the Roland LX708. It's possible that you may ...


4

Imagine how much worse the problem is on acoustic guitars, where the body resonates with the string and makes the resonances of the other strings that much louder! This is the result of physical forces acting inside the guitar, and every guitar is subject to the same physical processes, so your guitar is not broken or anything like that. The fix is ...


4

They don't usually put that tape, the sound engineer does, and he probably did at their last gig. Because the engineer microphoned the amp. Yes, they feed the actual sound the cones make into the mixer. And that tape marked the spot where the microphone was supposed to be pointed at to get a better (and hopefully feedback-free) sound. Why do they ...


4

Having thought about this some more, I've decided to rewrite my answer... Your doubts about the acoustic properties of the harp are understandable. When heard in an orchestral setting, the harp is relatively quiet, requiring careful orchestration if one wants it be heard within a multi-instrument texture. However, a concert pedal-harp is in fact capable of ...


3

Adding to @David Bowling's comment, quote: Sympathetic vibrations: when you play the fretted A, the instrument vibrates with frequencies that of course induce vibrations in the other strings. Each string has natural resonances at the fundamental, first octave, fifth above that, fourth above that, and so on. These correspond to vibrational nodes (...


3

This phenomenon is called sympathetic resonance. There's nothing wrong with your instrument, in fact it's probably a sign that your instrument is in good working order! What's happening is that the when you play the A on the E string, your instrument & the air around it is vibrating at that frequency (among others, but for the the purposes of this ...


3

You need to understand that a "clean sine wave" has no higher harmonics at all. A periodic signal (i.e., one with a clearly defined pitch) is generally a superposition of sine waves with frequencies that are integer multiples of the fundamental frequency of the signal. I.e., if you play an A at 440 Hz you will have harmonics at 2x440=880 Hz, 3x440=1320 Hz, ...


3

I agree with Tim, although playing around with the resonance can definitely be fun! Vocal resonance is the result of the shaping of the throat and mouth, something known as the first and second formant tunings (but I wouldn't worry about the terms just yet). In order to find great resonance you must be able to freely adjust the vowel sounds created by your ...


3

The thing you haven't really taken into account is that all instruments (including metal bars) have a range of frequencies, not just one, and you may have a range of resonant frequencies in the cave itself, so you will need to think about what tone you are intending to get. For example you may use an instrument that happens to have a harmonic at a resonant ...


3

Mud is almost always around 250 Hz. Widely it might be anywhere between 100 Hz and 500 Hz, but usually there's good content between 90 - 150 Hz and 300 - 600 Hz. For some reason, 250 Hz is one of the only magic frequencies where cutting it a little bit tends to clean up the sound on almost every mix. Finding resonance is different, and usually each ...


3

Typically sympathetic resonance generates more copies of the same harmonics or fundamental tones, not new tones in between as your post suggests. I can think of one or two phenomenon that would describe this but I'd surprised if you can hear these if the notes are not close together (e.g. maj or min 2nd). When two harmonic waves (i.e. notes) are played ...


3

Air! Which has to move. If the tube is struck, that in turn makes the air inside move - although the material the tube is made from may also vibrate. By blowing either into or across the tube, the air inside starts to move. This makes sound.


3

Well, you have just rediscovered sympathy! When plucking an E, any string which have an E as an harmonic not too far away (the low E and the A strings especially) will also resonate. As you do not mute them, the sound of these strings is lasting… That is actually normal ans a good sign: it both means that the guitar is well resonating, and that you are tuned ...


Only top voted, non community-wiki answers of a minimum length are eligible