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9.F ROOM EQ
"Room EQ" automatically calibrates your system according to the acoustic limitations of your room.
As they propagate, the audible frequencies from 20Hz to 20kHz cause a variety of phenomena with varying
degrees of impact on your listening experience.
To explain these phenomena simply, we can characterize them in 4 diffraction zones, each zone being de-
fined by a frequency band: (example for a medium-sized room)
•
Zone 1: From 20Hz to 40Hz. (sub-bass)
•
40Hz is the frequency below which uniform pressure variations are observed, with no reso-
nance "mode".
•
This means you can move around the room without feeling any noticeable difference in this
frequency range.
•
Zone 2: From 40Hz to 250/300Hz. (low frequency)
•
250/300Hz corresponds to the Schroeder frequency, which separates the resonating and rever-
berating behavior of a room.
•
This zone is the one that causes the most listening disturbance, with room modes and stan-
ding waves. Depending on your position in the room, the level of these frequencies can vary
considerably.
•
Zone 3: From 250/300Hz to 5000Hz. (mid-high frequency)
•
This zone has a high number of resonances and complex modes that can only be treated sta-
tistically.
•
Even so, the sound is easily diffracted by the physical elements in your room. A greater number
of diffracting elements means your room will be more acoustically neutral.
•
Zone 4: Above 5000Hz (high frequency)
•
This zone concerns only high frequencies (treble), which propagate like light in the presence
of obstacles.
•
Those frequencies are absorbed by soft surfaces and reflected by smooth, hard ones. The
strong directivity of these frequencies is more of a problem than the room itself. In other words,
we recommend that you face your speakers to benefit from all the frequencies at the top of the
sound spectrum.
"Room EQ" handles the most problematic zone, i.e. zone 2 with the low frequencies. The acoustic
pressure of these frequencies reflects against the walls of your room, creating various resonance-like pheno-
mena known as "room modes". These modes operate in all three dimensions and affect your listening expe-
rience according to where you are in the room, reproducing some frequencies at different levels. "Room EQ"
adapts the low-frequency response to your room, making the Capella speakers stand out from traditional
loudspeakers, for which this type of processing is impossible.
To complete this step, you need a microphone. If you own an iPhone of a higher generation than
the iPhone 6S, this operation is possible from your smartphone. For Android* smartphone users or for more
precise measurements, you will need to purchase the ZEN microphone, available on our website or from your
local dealer (p.69).
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