Speaker Room Optimization (Sro); Overview - BLUE SKY AUDIO MANAGEMENT CONTROLLER Manual

SPEAKER ROOM OPTIMIZATION (SRO)

OVERVIEW

SRO is a system for measuring the acoustic response of a speaker system and correcting the
speaker system to a target frequency response.
Note: if a valid USB audio interface is not found the measurement function will be disabled.
The measurement portion of SRO uses a special noise signal called a maximum length sequence
(MLS). Unlike white or pink noise, MLS signals have unique properties that allow them to be used
to calculate the impulse response of a speaker, which contains the complete frequency, phase, and
time response of the speaker.
Once, you have obtained the impulse response, with the use of a fast Fourier transform (FFT), it is
easy to calculate the frequency response of the speaker. Once the frequency response is
obtained, the next phase is optimizing.
During the optimization process, the uncorrected frequency response of the speaker is compared
against a desired frequency response called the target curve.
The target curve can be an "X" curve, a flat frequency response curve or an arbitrary curve that the
user created.
The software then compares the speaker response against the target and generates an error
value. The error value is a quantitative measure of how well they match. The larger the error the
worst the match.
The software uses filters (like a 1/3 octave equalizer) to correct the frequency response of the
speaker to lower the over all error (IE. a better match).
It does this using a genetic mutation algorithm called BOO, which generates thousands of different
EQ settings and determines which one gives the best match to the target curve
Once BOO picks the best match, the user has the option of accepting it or tweaking manually form
there.
One last point. The SRO program will correct many frequency response problems but it does have
limitations. It will not give repeated reliable results if the room is too noisy. It will not make a poorly
designed room with poor acoustic treatment sound like a well designed room.
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