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8
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HALO system User Manual
V2.2 August 2010
Processor Selection & DSP Settings
The HALO system requires a suitable DSP loudspeaker management system to allow for
crossover points, system EQ and delay. EM Acoustics recommends either XTA 4-series
processors or Lake processing – either stand-alone units or incorporated into the
LabGruppen PLM series of amplifier products.
The DSP program detailed below is based around a 12-HALO system flown with a single
HALO-S subwoofer at the top of the array. Crossover points between HALO/HALO-S are
of course at the user‟s discretion, as are gain structures. We would strongly suggest that
the HALO settings (shown in bold below) are
not
altered from our recommended settings
as this can result in poor performance and/or damage to the HALO components. The
other two EQ points will vary depending on the size of the array used – for smaller arrays,
less HF boost and 202Hz cut will be required and vice-versa.
LMF/HMF
Gain:
0dB
Polarity:
(+)
Delay:
0ms
HPF:
80.3Hz, 24dB/Oct
Linkwitz-Riley
LPF:
1k78Hz, 48dB/Octave
Linkwitz-Riley
EQ 1:
1k82Hz
Q=9
-14dB
EQ 2:
516Hz
Q=5
-9dB
EQ 3:
202Hz
Q=1.5
-5dB
HF
Gain:
+11dB
Polarity:
(-)
Delay:
0.5417ms
HPF:
7k55Hz, 12dB/Oct
Linkwitz-Riley
LPF:
20 kHz, 48dB/Octave
Linkwitz-Riley
EQ 1:
1k78Hz
Q=4
-4dB
EQ 2:
4k40Hz
Q=2
-2dB
EQ 3:
9k33Hz
Q=4
-4dB
EQ 4:
12kHz
High Shelf Q=1
+8dB
HALO-S
Gain:
+2dB
Polarity:
(+)
Delay:
0.0ms
HPF:
35Hz, 24dB/Oct Butterworth
LPF:
95Hz, 24dB/Octave Linkwitz-Riley
