Hot answers tagged

4 votes

DIY Portable Anechoic Chamber

Consider using an anechoic chamber from others. Every microphone and speaker manufacturer will have one, most Universities have huge EMI measurement chambers (working perfectly). They might let you ...
user avatar
4 votes

DIY contact microphone

Here is a nifty preamp circuit that provides a FET buffer and balances the signal, which deals with all the issues you are discussing. The circuit is based on the work of Alex Rice.) You attach the ...
user avatar
3 votes

What makes low quality speakers become distorted when at high volume?

There are a number of factors involved here but mainly frequency response, transient response, signal to noise ratio (S/N) and total harmonic distortion (THD). Frequency response is largely dependent ...
user avatar
  • 1,553
3 votes
Accepted

How does a cardboard paper towel roll amplify the sound?

Quite an interesting project indeed. The paper towel roll and cups are are working as an acoustic megaphone, also called (in ancient times) speaking trumpet. Directional focus of the radiating sound ...
user avatar
2 votes
Accepted

Speaker fabric cloth

Traditionally, it was called "grille-cloth" and it was made from a coarse-weave of rather thick plastic filaments. It is still available in many places, particularly those vendors who supply people ...
user avatar
2 votes
Accepted

what is the purpose of the internal volume of a speaker cabinet

It's actually a complicated thing, how much space to put behind a driver. The air mass behind the driver actually affects how the driver moves. If you put the right volume of air behind the driver, ...
user avatar
  • 2,030
2 votes

What makes low quality speakers become distorted when at high volume?

Schizomorph makes a solid answer for all the technical details, but I'm going to break it down more basically. Sound consists of pressure changes. A speaker makes sound by moving a diaphragm that ...
user avatar
  • 8,081
2 votes

DIY Portable Anechoic Chamber

There are pre-existing facilities that regularly measure the frequency response of microphones. you should call one of them (try pcb) and talk to them about your project... A chamber might not be the ...
user avatar
2 votes

How do loud speaker manufacturers achieve frequency response ranges as low as 20Hz for its speakers and headphones?

Engineering. Speaker manufacturers have research and development departments staffed with engineers that spend a lot of time to develop crossovers (capacitors,resistors and coils) in conjunction ...
user avatar
1 vote
Accepted

Are transmission line enclosures only good for subwoofers?

There is long history of Transmission line speakers. Are transmission line enclosures only good for subwoofers? No, They excel at bass but most are full range speakers. I have a nice pair of DCM ...
user avatar
1 vote
Accepted

Combining speaker drivers due to damaged component

It's possible, but requires expertise. You need the specifications for all of the speaker components. Then you can build a passive filter that combines a woofer and tweeter, plus a new enclosure that'...
user avatar
  • 1,548
1 vote

Advice on Building a Portable foley stage/pit

Foley 'pits' are usually used for the footsteps part of the foley process. Consequently each 'pit' will contain a different 'surface' to be used for footsteps. Unfortunately some surfaces will be ...
user avatar
  • 8,374
1 vote

What makes low quality speakers become distorted when at high volume?

Where as the other answers talk about technical measurements, they don't actual answer why sounds distort on speakers. This happens because of physical deformation of the cone, as well as travel ...
user avatar
  • 674
1 vote

Splitting mono RCA plug to stereo

Yes, you can shunt (short-circuit) the two signal conductors of the stereo cable and connect the output from the VCR to that cable with fear of damaging your equipment. This is a common quick fix for ...
user avatar
1 vote

How does a cardboard paper towel roll amplify the sound?

Pitch content that roughly matches the resonance tendencies of the shape will also get a boost relative to the other frequency content. The resonance frequencies of the tube are probably very limited, ...
user avatar
1 vote
Accepted

How can I change bass reflex tube from 80mm to 75mm?

It is no practical problem to use a 75mm diameter instead of 80mm. It could even be that you have the correct size already, as (for the loudspeaker as such) it is the inner diameter that is relevant. ...
user avatar
1 vote

Building a high-powered bluetooth speaker, need input on components

The Specs on the Brookstone Big Blue Party speaker: 4 speaker drivers, subwoofer and passive radiator Power: 72 watts (18 watts per channel, 36-watt sub) Frequency response: 40Hz-20kHz Dimensions: ...
user avatar
  • 111
1 vote

Shielded microphone cable for instrument piezo or magnetic pickup

Generally speaking a shield should not carry signal. It should be grounded at one end, usually the source but in this case probably at the input. That would mean connecting the hot signal line to the ...
user avatar
  • 1,721
1 vote

DIY Portable Anechoic Chamber

Unfortunately "small" and "anechoic" are mutually exclusive, at least at low frequencies. The length of the wedge absorbers needs to be at least a quarter of a wave length plus some extra space for ...
user avatar
  • 211

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