smms

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.

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?

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.

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

The floor reflection

what what...what is the floor?

merio...erneshtow...what is the floooorrrr?

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?

go uelle....I put picciurs of this keele...

what you say :"annamo bbene!" ?

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

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....