Pioneer SC-9540 Operations Instructions download pdf (Page 19)

How to Interpret the Graphs (Continued)

Deciding the time period for Advanced EQ Setup calibration

With conventional MCACC EQ calibration, the microphone input’s data acquisition time was fixed at

between 80 and 160 [ms] (red part of Figure 1). By contrast, with the receiver’s Advanced EQ Setup function

allowing more professional equalization, the customer can select individual points between 0 and 80 [ms]

(with a 20 ms width) (blue part of Figure 1).

You can specify the time period setting using the “Advanced EQ Setup” in the “EQ Professional” sub-menu

(in the “Manual MCACC” menu). This setting is not required if you’re satisfied with the results of the “Full

Auto MCACC” setup (For details, see page 116 (SC-27, SC-25)/102 (SC-9540) of the receiver’s Operating

Instructions).

Figure 1 Comparison of microphone data acquisition time periods

To decide the time period for Advanced EQ Setup calibration, view the graphs of the measured reverb

characteristics, and refer to the following three patterns.

Pattern 1: Different reverb characteristics for high and low frequencies

In rooms with reverb characteristics like those shown in Figure 2, lower frequencies often seem overly

reverberant compared to higher frequencies (i.e. the room sounds ‘boomy’). With conventional MCACC EQ

calibration, data between 80 and 160 [ms] (red part of Figure 2) was acquired, so the low frequency volume

was deemed high and the high frequency volume deemed low, and the equalization curve was calibrated

with the high frequencies somewhat boosted. However, for the characteristics of the sound reaching the ear

directly within about 40 ms, there is enough volume that there is no real need to boost the high frequencies,

so with equalization using the conventional MCACC EQ calibration the high frequencies sometimes

sounded too strong. Therefore, the Acoustic Cal EQ may result in a room where high frequencies sound

shrill. In cases like this, setting the time period for Advanced EQ Setup to 30 to 50 msec (the blue area

in Figure 2) to adjust for sounds coming directly from the speakers can flatten the frequency response

for direct sounds (including initial reflections) and give a better-balanced sound field.

Figure 2

Note

Level

(dB)

Conventional MCACC EQ

calibration time range

(fixed)

Time (in ms)

EQ calibration time range

selectable for Advanced

EQ Setup function

(selected automatically for

Full Auto MCACC)

Level

(dB)

Time period

point to be

selected

Time (in ms)

Low frequencies

High frequencies

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Pioneer SC-9540 Operations Instructions Page 19

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