Questions tagged [acoustics]

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

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2answers
71 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
29 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....
2
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3answers
732 views

How do sound waves travel and their reflections?

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 ...
2
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3answers
96 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 ...
6
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1answer
84 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 ...
3
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2answers
144 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 ...
5
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2answers
84 views

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
85k 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 ...
4
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5answers
792 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 ...
19
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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
368 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
97 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 ...
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3answers
565 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 ...
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6answers
1k views

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
99 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
172 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
95 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 ...
3
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3answers
74 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
1k 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
81 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
96 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
126 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
995 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 ...
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3answers
400 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
451 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
130 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 ...
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0answers
155 views

Irregular resolution [closed]

What are the primary conditions concerning the IRREGULAR resolutions of the following harmonies in common practice music?: -Dominant chords -Auxiliary Seventh chords (chords of sequence) -...
2
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1answer
252 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
350 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
103 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 ...
11
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2answers
709 views

How do I know where to place holes on an instrument?

I've been trying to build a double reeded instrument out of plastic straws. I've run into a problem though, when I place fingering holes, the instrument doesn't seem to follow the $$f=/frac{nv}{4L}$$ ...
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2answers
533 views

How much louder than an upright is a small grand piano?

I now have a kawai upright (height 135cm) and I'd like to upgrade to a small grand piano (around 170 cm I think). I'm wondering how much louder it will be. I don't really need a louder piano, my ...
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2answers
107 views

How effective are acoustic panels to deaden a room?

I need to deaden an echoing drum practice room and am considering acoustic panels, probably DIY ones 3.5" deep filled with rock wool. I'm look at these vs. heavy blankets for aesthetic reasons. I'd ...
4
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2answers
212 views

Calculation of a note's frequency in the 18th-19th century

Suppose you are trying to reproduce an A major scale from the early 18th or 19th century, when A4 was perhaps tuned to 429.3Hz. What is the correct frequency (in Hz) for the next C# up (assuming we ...
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3answers
2k views

What is brightness?

I hear the term get thrown around a lot, and it seems pretty nebulous. Usually, it's invoked under the heading of tone, but I've heard it linked to intonation and a handful of other categories. At the ...
4
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1answer
1k 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 ...
5
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1answer
54 views

Microdynamics of bow rosin and strings

Discussion in comments here questions whether the rosin on bow hairs changes physical characteristics in the course of stimulating vibration in a string. Consensus seems to be that: the physical ...
3
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1answer
127 views

Textbook vs real world explanation of loudness perception

I read that if you double the number of instruments playing, i.e double the amount of acoustic energy, then the perceived loudness rises by 3 dB. I've also read that a 3 dB change is almost ...
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1answer
139 views

Why do B and C resonate sympathetically?

While experimenting with piano acoustics I came across this weird phenomenon. Having an open B string and then hitting the C above will cause the B to resonate! This also works with open C and playing ...
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1answer
49 views

Isolation of acoustic body size with respect to volume and sustain?

Let's say we have two identical acoustic guitars with the only difference being the body size. How will the body size effect sound volume when considering a string plucked with the exact same amount ...
8
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4answers
1k views

What causes overtones at harmonic frequencies in an instrument? [duplicate]

I know when a string is plucked on a violin you can hear many overtones at harmonic frequencies, but where do these overtones come from? Does an ideal string vibrating in a vacuum vibrate at the ...
2
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3answers
280 views

Alternatives to acoustic foam

I get health reactions from acoustic foam. I tried different brands. It's unfortunate. Still, i would like to treat the acoustics in my little home studio as good as possible. What could i use as ...
8
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1answer
234 views

Why can a vuvuzela only play one pitch, while a non-valved bugle can play many?

According to our collective nightmares from the 2010 World Cup Wikipedia, the vuvuzela is a monotone instrument; it famously plays (roughly) the B♭ below middle C. Why is the vuvuzela restricted to ...
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4answers
981 views

Does shape of waveform affect sonic perception?

Title says it all - does the shape of a wave have any effect on how we perceive it as a sound?
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5answers
347 views

A seriously difficult question about mistakes and intepretation of music

I just came up with a question that I've never seen asked or talked about. It maybe obvious to everyone else in the world but I realized I simply can't answer it except with the non-answer. This is ...
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5answers
7k views

Can eggboxes really be used to treat a room? If so, how?

I'm thinking about acoustically treating my room so I can listen to my mixes in higher clarity. I'm trying to think of how I can do it cheaply (even though you get what you pay for, I suppose), and my ...
11
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2answers
2k views

Trumpet Peculiar Frequency spectrum

So I made this frequency spectrum analyzer and tested various instruments playing a certain note. There doesn't seem to be any problem with the 'equalizer'. However, I found the spectrum for trumpet ...