Svs AS EQ1 Manuel d'utilisateur télécharger pdf (Page 33)

AS-EQ1 Operator Manual

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6420 Belmont Avenue, Girard, OHIO

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703.845.1472

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www.svsound.com

SV Sound, LLC

Appendix A - Why EQ?

Despite efforts by speaker designers to provide a speciﬁc type of frequency response for their products, the

environment in which they are tested is typically anechoic (a room designed to absorb sound and eliminate reﬂec-

tive effects) or quasi-anechoic (ground plane). This test environment removes the acoustic effects of the listening

room, and allows the designer to speciﬁcally tailor the characteristics of the speaker to a desired set of criteria.

In many (but not all) cases the designer will try and achieve a “ﬂat” response – e.g. very close to the same energy

produced at all frequencies covered by the speaker. The attached graph shows a plot of sound energy of a ﬂat

subwoofer in an quasi-anechoic environment.

When a speaker or subwoofer is then placed in a non-anechoic environment (read – our listening rooms and

Home Theaters) the frequency response of the speaker/subwoofer is rarely close to that measured in the anechoic

environment, due to the reﬂection and absorption of sound waves off of hard and soft surfaces. This in turn causes

positive and negative reinforcement of sound energy and as such, the sound that then reaches our ears may seem

overly loud in some frequencies and muted in others – and deﬁnitely different than what the speaker designer and

recording engineer intended. The attached graph is an example of the effects of a listening room on our formerly

ﬂat subwoofer.

Subwoofer Response in a Quasi-Anechoic Environment

FIG. 20

1 2 ... 28 29 30 31 32 33 34 35 36 37

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Svs AS EQ1 Manuel d'utilisateur Page 33