Geometrical Alignment; Measuring And Aligning Phase In The Overlapping Region - Yamaha Nexo NXAMP4X4 User Manual

We recommend that the system is adjusted so that arrivals from MAIN SYSTEM array and
SUB speakers are coincident at a fairly distant listening position (typically further than the
mixing position).

Geometrical alignment

In the example below, r
position, and r
being the smaller distance from SUB to listener position, the distance
2
difference is then r
• r > r
, the delay should be set on the SUB NXAMP Powered TDcontroller(s).
1 2
• r < r
, the delay should be set on the MAIN SYSTEM NXAMP Powered
1 2
TDcontroller(s)
To convert the result in time delay (specified in seconds), apply:
∆t = (r
The delay parameter is set in MENU "Delay" (See above).
750 mm
[29.53"]
750 mm
[29.53"]
750 mm
[29.53"]
750 mm
[29.53"]
750 mm
[29.53"]
750 mm
[29.53"]
1200 mm
[47.24"]
1200 mm
[47.24"]
However, it is a safe practice to double-check geometrical alignment with a proper
1200 mm
[47.24"]
acoustical measurement tool.

Measuring and aligning phase in the overlapping region

Microphone must be set on the ground, at a fairly distant listening position (typically
further than the mixing position).
Phase must be measured with a wrapped display, and measurement must be properly
windowed on signal arriving time (same window for SUB and MAIN SYSTEM). When
measurement is synchronized to the system-microphone distance, phase can be clearly
displayed in the low-frequency range.
INSTALLATION RECOMMENDATIONS
being the smaller distance from MAIN SYSTEM array to listener
1
–r (specified meters or feet).
1 2
)/C r and r
-r in meters, C (sound speed) ≈ 343 m/S.
1 2 1 2
r
1
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r
2