Pioneer SC-07 manual Deciding the time period for Advanced EQ Setup calibration

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).

Note

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 50 in the Operating Instructions).

Figure 1 Comparison of microphone data acquisition time periods

Level
(dB)
Acoustic Cal EQ	Conventional MCACC
Professional	EQ calibration time
calibration range	range (fixed)
(selectable points)	Time (in ms)

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

Level (dB)

Low frequencies

High frequencies

Time period point to be

selected

Time (in ms)

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