Nexo NXAMP User Manual download pdf (Page 30)

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PAGE 30

INSTALLATION RECOMMENDATIONS

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

being the smaller distance from MAIN SYSTEM array to listener position, and r

being the smaller distance from SUB to listener position, the distance difference is then r

–r

(specified

meters or feet).

> r

, the delay should be set on the SUB NX242 TDcontroller(s).

< r

, the delay should be set on the MAIN SYSTEM NX242 TDcontroller(s)

To convert the result in time delay (specified in seconds), apply:

t = (r

-r

)/C r

and r

in meters, C (sound speed) 343 m/S.

The delay parameter is set in MENU 1.2 (set the units to meters, feet or seconds according to your

preference).

However, it is a safe practice to double-check geometrical alignment with a proper 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.

1200 mm

[47.24"]

750 mm

[29.53"]

750 mm

[29.53"]

1200 mm

[47.24"]

750 mm

[29.53"]

750 mm

[29.53"]

1200 mm

[47.24"]

750 mm

[29.53"]

750 mm

[29.53"]

NX242 USER MANUAL LOAD2_22

DATE : 12/3/2004

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Nexo NXAMP User Manual Page 30

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