Test Tone - Genelec 7260A Operating Manual

Roll-Off
The frequency response of the subwoofer may have to be adjusted to match the acoustic environment.
The Bass Roll-Off adjustment reduces the level of the very low subwoofer frequencies. You can combine
the - dB, -4 dB and -8 dB switches, providing an attenuation range from 0 to -14 dB – see table below
for examples of combinations and the corresponding attenuation.
Roll-Off
-0 dB
-2 dB
-4 dB
-6 dB
-8 dB
-10 dB
-12 dB
-14 dB

Test Tone:

The DSP subwoofers contain a tone generator for phase alignment. The "TEST TONE" switch activates
the tone generator at the crossover frequency. The test tone signal is sent to OUTPUT 1 on AES/EBU
subframe A. To perform an adjustment one main loudspeaker has to be connected to this channel and set
to reproduce this signal with the subwoofer.
Phase:
The phase relationship between a main loudspeaker and the subwoofer must be adjusted at the crossover
point. A 0, -90, -180 or -70 degrees of adjustment is provided at 85 Hz – see table below for switches
combinations and the corresponding phase change. Incorrect phase alignment between the loudspeakers
and the subwoofer causes a drop in the frequency response around the crossover frequency.
Acoustic measuring equipment such as Genelec AutoCal accurately align the phase. Alternatively, the
following quick phase alignment process can be done:
Phase
0°
-90°
-180°
-270°
18
Sw 1 (-8 dB) Sw 2 (-4 dB)
OFF OFF
OFF OFF
OFF ON
OFF ON
ON OFF
ON OFF
ON ON
ON ON
Sw 6 (-180 deg)
OFF
OFF
ON
ON
Sw 3 (-2 dB)
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Sw 7 (-90 deg)
OFF
ON
OFF
ON