Geometric Delay; Applying Eq - EM Acoustics Halo Compact System User Manual

Page 43 of 60

12.2.2 - Geometric Delay

To ensure your system performs as intended, appropriate delay will need to be added to
different elements to ensure everything is correctly time-aligned – for example aligning
subwoofers to the main array hangs. This delay is determined by both geometric
position and filter slopes applied. Use of a measurement tool such as SMAART will help
to align your system.
It is of paramount importance that any delay applied to a line array hang, is applied to the
entire hang – if delay is only applied to one part of the array (for example only on
amplifier A in the example on the previous page) then the array would not perform
acoustically as it should, and performance will be wildly different to what was simulated.
As such it is always best to apply this delay on the input side of the amplifier (for
example in the FOH desk, overall system processor if present, or in the input DSP of the
DQ Series unit), or if using multiple amplifiers then to group Modules together in System
Engineer software so the delay can be applied and adjusted identically on all relevant
modules.

12.2.3 - Applying EQ

The presets are intended to be a starting point for your system, and will almost certainly
require tuning on-site dependent on room characteristics, the rest of your system design
and the system voicing you are aiming for. HALO-B is designed with a significant amount
of system headroom, so applying EQ is perfectly acceptable.
EQ filters add group delay into a system, and as such just as with delay above, it is
imperative that the same EQ filter is applied across the entire array to ensure that the
system still performs as a line array. EQ filters applied to only one section of an array will
impose a group delay on that part of the system, which will bring further acoustical
issues.
HALO Compact User Manual
V7 December 2019