mèshiur

mèshiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:04

by Joe D'Appolito


on Theory Articles



Measuring Loudspeaker Low-Frequency Response

November 14 2018, 05:10
NOVITA' FRESCA FRESCA

https://www.audioxpress.com/article/mea ... y-response


With the availability of low-cost, PC-based acoustic data acquisition systems, experienced hobbyists can make highly accurate loudspeaker frequency-response measurements without an anechoic chamber. Popular systems include: Audiomatica's CLIO, MLSSA, Praxis (now part of the Dayton Audio OmniMic measurement bundle, available through Parts Express and Dayton Audio), and SoundEasy (also available though Parts Express), to name a few. The power of these systems comes at a price. These systems window the time-domain measurement to eliminate room reflections. This, in turn, limits low-frequency response.
Typically, response below 200 to 300 Hz is not possible in reasonably sized rooms.
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tran quoc
 
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:09

she uont to meshiur " i cassi" without the room ( it's all right!)

she can not megiur "i cassi" if the room makes miscugliescion ping pong rimbalz gong

but


what she can do of such a meshiur?
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:15

The Problem ( coso direbbe: so ccazzi!)

The goal is to measure the on-axis far-field response of a loudspeaker, free of any room effects. Reflected energy from the nearby floor, walls, and ceiling will arrive at the test microphone later than the direct wave. Depending on the path-length difference (therefore, the phase difference between the two arrivals) the reflected waves may add to or subtract from the direct wave.
Let’s look at the effect of a single reflecting surface.
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:22

https://cdn.xingosoftware.com/audioxpre ... sponse.jpg

joe d'app....ops...she does not consider the 3 walls pobblem
raised, in AES conference- simposium- car-radio-meeting, by calabres "copy" mother's papers, filled ( later) with it's lake paperells
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:33

The floor reflection



what what...what is the floor?

merio...erneshtow...what is the floooorrrr?
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:38

First, Keele assumes all radiating surfaces are mounted on an infinite baffle.


minghiuuuzza....bedda maciriiiii....!

ennestow...who is this keele ?...is it an esterus rimorchiatus filippus punzus UNZ UNZ punz?
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:41

go uelle....I put picciurs of this keele...
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:43

what you say :"annamo bbene!" ?
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:52

most loudspeakers have relatively narrow baffles so they become omnidirectional at low frequencies.


d'appol,

they ALL are omni...the only difference is the amount of " wood refraction"...

see & follow romoletto at lake, a paper back writer
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Re: megiur

Messaggio da leggereda tran quoc » 27 nov 2018, 11:55

tran quoc ha scritto:
most loudspeakers have relatively narrow baffles so they become omnidirectional at low frequencies.


d'appol,

they ALL are omni...the only difference is the amount of " wood refraction"...

see & follow romoletto at lake, a paper back writer



CAZZU goes in "narrow with omni?...wave AGGIRA?

eeeeeeeeeeeeeeeeee.....allora avissi a viriri....
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