Questions tagged [acoustics]

The physical science of sound production, behavior, and mechanics.

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2
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0answers
50 views

Fiberglass vs Rockwool: What are their pros / cons in making acoustic panels?

I'm trying to decide which material to use for DIY acoustic panels. Rockwool and Fiberglass have comparable sound absorption except for ~125 Hz where Rockwool performs much better. But I can buy 3x as ...
7
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2answers
160 views

What is the physical mechanism by which a chord has a root?

When the tones C, E and G are played, C is perceived as the root. In the case of this major triad, the root is easily identifiable. However, for many chords, there is no identifiable root. For example,...
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8answers
2k views

Why is the 5th stronger than the 1st in guitar spectrum?

I was experimenting with spectrum analysis of guitar plucks and this is what i got on an open low E recording: As you can see the strongest peak is at about 247 Hz, which is a B3 while the peak at ...
4
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3answers
1k views

Need help understanding harmonic series and intervals

So I need some clarification as this is confusing me terribly. What are the first 12 harmonic series of a fundamental (Lets say A (440hz)? Do those harmonic series of the fundamental pertain to every ...
2
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2answers
91 views

Audio latency in live bands

In computer music one usually says that the audio latency of the system should ideally be less than 10ms… On the other hand, as the speed of sound is around 340 m/s in the air it means that whenever ...
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2answers
6k views

What exactly are complex sounds in terms of audio waves?

If you listen to a song through headphones you have a "right" sound wave and a "left" sound wave, correct? But these waves have a lot of complex sounds combined in them and a digital sound wave is ...
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8answers
1k views

Can you change some composition I wrote to whatever music you want just by changing the timbre of the instruments?

Here is my problem: suppose I am a composer you have contracted to create any sheet music I dream of with the unique condition it is not pure silence and that I don't stipulate the instrument section (...
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6answers
1k views

Is there actually an “undertone series”?

We know there is an overtone series, or harmonic series, i.e. if a note A of 440 Hz is being played on a musical instrument, there will also be different amplitudes of sound of 880 Hz (440 Hz * 2), ...
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7answers
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When we press a piano key, why does a high pitch note not run for as long as a low pitch note?

When we press the keys on the piano that exist on the ends, one can notice that when we press a high pitch note, it plays for a short bit and then the sounds fades away. However, when we play a low ...
2
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1answer
57 views

Doubt about Harp Sound

I have some doubts about the acoustics of the harp? What is the resonant oscillator and sound effuser on a harp? For example, on a trumpet, the resonant oscillator is the body of the instrument ...
2
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1answer
130 views

Flutes in octaves sounds like an organ? Why does this happen?

I have noticed something when I hear 2 flutes in octaves or a flute and piccolo playing the same notated notes, sounding an octave apart. It starts to not sound like a flute. In particular it sounds ...
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1answer
56 views

Transcriptions that (more) directly relate to physical frequencies

Where can I view not traditional Western cleff based transcriptions of music, but rather ones that map directly to the physical differences in pitch being written down? So instead of something based ...
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1answer
2k views

Is a wind-string instrument (such as the one I will explain) acoustically possible?

I've always had this concept of an instrument, but I am wondering if such an instrument is even acoustically possible. The instrument is a tube, like most other woodwinds, but inside of the tube is a ...
12
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3answers
4k views

Is it a coincidence that the length of the body of a violin is pretty exactly one fifth of the wave length of its lowest note?

The standard body size of a violin is 35 centimeter in length. Its lowest note is G3, which has a wave length of 175 centimeter, five times 35. 35 cm is the wave length of B5, which is a major third ...
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1answer
642 views

Are the Piattino Sound Proofing Castor Cup really efficient and are there other equivalent solutions?

I am improving my piano practice room and I found recently the Piattino Sound Proofing Castor Cup. These work, as far as I understand, by absorbing vibration from the piano to the structures around ...
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5answers
4k views

Any bed sheets thick enough to be used as sound proofing?

I am curious of anyone has any alternative ideas to standard/typical sound proofing. Currently I do not feel like constructing anything elaborate and I really can't do to much were I live. Noise isn't ...
4
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1answer
122 views

Creating a xylophone out of copper pipes

I have been trying to create a xylophone out of copper pipes for a school project and have been running into a few problems with calculating the length of each bar. I have been using this paper as ...
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1answer
30 views

Acoustic problem of intonation low on neck

I am a bass player for over 35 years. Also play guitar. I have worked on my own electrics, setting intonation, etc. I have an acoustic. When I tune it, the low E, fretted at the 2nd 3rd frets are ...
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2answers
84 views

How to make a single instrument fill up a sound spectrum?

I have an instrumental here (not particularly a fan of, but great reference for this question.) This instrumental starts off with and contains a synth pluck with a simple melody. My interest in this ...
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0answers
35 views

Could you clarify these statements regarding depth in a mix

I'm trying to establish the correct formula for these settings if you guys could correct them. It is imperative you're 100% sure of the answer as this plays a vital piece in my understanding of reverb....
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3answers
791 views

How do sound waves travel and their reflections? [closed]

I'm studying reverb from a first principles standpoint and I'm finding it difficult to find this answer in my studies. Firstly is this statement correct? "The quantity of sound waves ejected into a ...
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3answers
140 views

How long do early reflections take to become audible after direct sound [closed]

When speaking in terms of reverb, how long do early reflections take to occur/become audible after the direct sound? Also, do early reflections dictate if a space is long/short or does it also ...
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1answer
88 views

Is there some means of expanding the range of a capped reed instrument?

Given the pitch limits of capped reed instruments, I wondered whether some means of expanding the range of such existed. Perhaps with some sort of embouchure mimicking device surrounding the reed, but ...
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2answers
171 views

How could the Greek (Pythagoras et al.) measure the frequencies - as they didn't have a mobile app? [duplicate]

How could the Greek (Pythagoras et al.) measure the frequencies - as they didn't have a mobile app? They didn't have a tuning fork or any other standardized measure. But even without standards they ...
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2answers
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how to tune a spring?

So here's the situation I'm in; I had this really weird dream with this really weird instrument in it. It was kinda like half a dulcimer with springs on it. There were 11 springs on it, (But I'm ...
22
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7answers
90k views

How can I reduce the echo/reverb in a large room if I can't add physical damping?

I was at an event this evening in a restored ballroom - absolutely beautiful, but parquet flooring, high ceilings, solid walls etc all made for terrible acoustics, and in fact I could hardly make out ...
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5answers
1k views

Physics of Guitar frets and sound

I understand how Guitar works. Pitch/Frequency of sound produced depends on length of vibrating string. So we have different frets to product different notes. Fine. However I am curious to understand ...
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1answer
3k views

How does a pipe organist deal with latency or delay?

I've seen church setups (choir loft in back) where the organ console is 30 Meters or more away from the pipes. That implies that there would be a minimum of 100 milliseconds from pipe sounds back to ...
5
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2answers
436 views

Is there a noticeable difference in sound quality between a mechanical pipe organ and an electronic one?

What I'm trying to get a feeling for is how well an electronic organ can mimic the sound of a pipe organ. I know there are very advanced electronic organs where every single note for every stop is ...
2
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3answers
99 views

How do I curtail the reverberation in my church

My church sits about 2500, normally we had drapes on stage and behind stage to help absorb the sound but then the ceilings were not in place, I gave specifications to my boss to use perforated ...
2
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3answers
598 views

Accounting for intervals not present within the chord ratio?

Here are a selection of chord ratios.. Minor Chord - 10:12:15 Root (1:1) - Major 3rd (4:5) - Perfect 5th (2:3) Major 7th Chord - 8:10:12:15 Root (1:1) - Major 3rd (4:5) - Perfect 5th (2:3) - Major 7th ...
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6answers
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Do interval ratios take overtones into account or solely the fundamental frequency?

An interval holds two pitches (C an G). Those two pitches have a fundamental frequency which represents their pitch names, along with their harmonic series/overtones. When we turn that interval into ...
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2answers
132 views

Harmonic series role in a just intonation interval ranking?

In my studies, I was reflecting on this theory and just wanted your guys clarification.. A pitch in an octave is comprised of a fundamental frequency followed by its overtones. When we focus on an ...
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1answer
254 views

I have questions revolving around the formula of producing chord ratios?

Good day guys! Thanks to the gentleman @willross1 and others contributions, i have now discovered the formula behind turning interval ratios into chord ratios, which allows me to determine the level ...
3
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1answer
144 views

Stability of chords

I wish to understand the connection of music theory to the physics world, or to waves. In this context, I quite understand notion of dominant chords as containing tritone, which is dissonant. What I ...
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3answers
79 views

Echo reduction - large room

I was asked to propose a solution to reduce echos in a large event hall measuring 70 feet long by 60 feet wide with ceiling height 14 feet( I have never done anything of this sort before). The room ...
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4answers
2k views

How are chord ratios developed exactly?

Major Chord 4:5:6 Minor Chord 10:12:15 Diminished Chord 20:24:29 Are 3 examples of triad chord ratios. My question is how are these ratios developed? If we look at a Major chord in the key of C, it ...
2
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3answers
101 views

Fourier Analysis of varying classical guitar bracings

I am doing a school project right now concerning studying the Fourier Analysis of a sound recording of a few different classical guitars. I am wondering what type of sounds would be the best to record....
2
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2answers
169 views

When the human voice changes pitch are certain interval changes physically easier?

I'm wondering along the lines of physics and how things resonate. I don't know how pitch changes work when something vibrates, especially the voice or wind instruments. I sort of understand that a ...
6
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3answers
172 views

Music Physics Question - Automatic Trumpet Embouchure Mouthpiece

So this might be a bit of a newbie question. I'm a working musician who mainly plays guitar and piano, and uses a lot of sampled instruments and synths as well. I don't mean this to be offensive to ...
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5answers
1k views

Scaling an object to change its key

I used a 3D Printer to make a kid's Recorder for my son. It plays surprisingly well. However, it's not tuned to match the common recorder used in schools. Using a phone-app tuner, the base mouth-piece ...
3
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3answers
993 views

Amplitude of a crest and trough in a sound wave?

Lets say we have a sound wave, it has a frequency, wavelength, crest, trough, etc. My question is, is the crest of a sound wave equaled to high amplitude/ high volume and if so, does that mean the ...
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4answers
3k views

Do cold/hot drinks have any effect on woodwinds and brass performers?

Hey, I saw this question and I immediately remembered one or two teachers that kept saying that drinking cold/hot drinks before and/or during playing any woodwind or brass instrument was a bad thing, ...
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3answers
662 views

Piano Tuning: How accurate is ±0.5 cents?

A tuner accuracy is ±0.5 cent. Does that mean that it is highly sensitive or just decently sensitive for pitch accuracy?
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4answers
3k views

Why does a clarinet behaves like a closed pipe?

Saxophones, oboes and generally generally most woodwind instruments I can think of behave like open pipes. That seems logical; when every key is closed, they actually are open pipes and, if I remember ...
6
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1answer
141 views

What are the effects of the shape of a bend in a brass instrument slide?

Some brass instrument manufacturers make a feature of the shape of the various slides - some have a semi-circular wrap, other more semi-elliptical. Some have a tight wrap (the two legs of the slide ...
2
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1answer
272 views

How accurately can a good musician judge an interval to be out of tune? [closed]

This is for a music/physics crossover experiment. Almost everyone will be familiar with the Doppler Effect, even if they don't know the name. Imagine that a vehicle is blaring its a siren or ...
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6answers
410 views

Accurate understanding of the physics of sound?

I'm trying to learn theory. I'm starting with the physics of sound as the base. Here is what I (think I) know. Is this accurate? Music is sound. Sound travels in waves. Sound waves have two ...
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3answers
107 views

A truly perfect unison

Two notes are two notes. At least, it seems that way. When people play two notes at two frequencies, they sound like two notes, even when they're playing in unison. There are a variety of factors ...
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3answers
10k views

Why do people place speaker cabinets or combo amps on top of things?

In a lot of gigs I've played, I have noticed that they have placed the amplifier speaker cab (usually just the bass amp) on top of a chair or a stool or something, so as not to be on the ground. What ...