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3.0 - Connections, Processor and Amplifier Selection
Connecting your loudspeakers
HALO enclosures are bi-amplified and use Neutrik Speakon
they require 4-core cable to function correctly. Standard pin connections are LF/MF on
pins 1+/1- and HF on pins 2+/2-.
HALO-S subwoofers are wired pins 1+/1- with pins 2+/2- connected as a link-through.
Cable Selection
All cables add to the system impedance, and as such careful selection is required
depending on your amplifier setup and overall system impedance.
maximum cable lengths are given below:
Conductor Area
2
1.0mm
2
1.5mm
2
2.0mm
2
2.5mm
2
4.0mm
2
6.0mm
IMPORTANT NOTE REGARDING SYSTEM IMPEDANCE
The HALO HF drive unit drops to 4 ohms across a reasonable portion of its operating
band. This can cause problems with some amplifiers when connecting the high frequency
sections of more than two HALO enclosures in parallel on an amplifier channel. However,
with the cable lengths involved in most line array usage scenarios, there is sufficient
impedance in the cable alone to bring the impedance up to a suitable level to prevent
amplifier problems.
frequency sections to a given amplifier channel, ensure cable runs of at least twenty
metres between the amplifier and the loudspeaker.
Amplifier Powers
We recommend the following power inputs for HALO enclosures:
HALO LF/MF (8 ohm impedance)
HALO HF
HALO-S (4 ohm impedance)
Maximum Recommended Cable Length
4 ohms
11m
17m
22m
29m
44m
66m
We would recommend when connecting 3 or more HALO high
TM
NL4 connectors - as such
8 ohms
22m
34m
44m
58m
88m
132m
500W RMS, 1000W Program
375W RMS, 750W Program
1000W RMS, 2000W Program
HALO system User Manual
Page 6 of 39
Recommended
16 ohms
44m
68m
88m
116m
176m
264m
V2.2 August 2010
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