L-Acoustics ARCS User Manual

L-ACOUSTICS ARCS Manual V2.0 2/13/2003 35
Techniques for controlling this interference and maximizing the combined response of low and sub
channels are discussed below.
In general terms:
3W presets have an 80 Hz LR24 low pass filter for the subwoofers with a complimentary 80 Hz LR24
high pass filter for the ARCS low section. These presets are recommended for either stacked or flown
ARCS/ground stacked subwoofer applications and are suitable for either sub drive via aux send or 3-
way mode.
3WX presets have an 80 Hz LR24 low pass filter for the subwoofers and an overlapping 40 Hz LR24
high pass filter for the ARCS low section (plus low frequency shelving equalization). Due to the
overlap in the operating bandwidths of the sub and low sections, sub polarity may have to be adjusted
depending on how the subs are driven: sub polarity = positive for sub drive via aux send, sub polarity
= negative for sub drive in 3-way mode.
Table 11: Subwoofer and Low Section Processing for ARCS 3-Way Presets
PRESET
TYPE
SUBWOOFER DRIVE SUBWOOFER
BANDPASS
ARCS LOW
BANDPASS
SUBWOOFER
POLARITY
3W 3-way mode* 25-80 Hz 80 – 800 Hz Positive
3W Separate aux drive** 25-80 Hz 80 – 800 Hz Positive
3WX 3-way mode 25-80 Hz 40 – 800 Hz Negative
3WX Separate aux drive 25-80 Hz 40 – 800 Hz Positive
* 3-way mode = same signal sent to ARCS array and subwoofers
** Separate aux drive = sub signal is independent (not sent to ARCS array)
b) Ground Stacked Systems
For ground stacked systems, ARCS and SB218 or dV-SUB subwoofers are physically close to each
other and time alignment is simplified throughout the entire audience area since there are no arrival
time differences between the flown ARCS array versus ground stacked subwoofers. Typically, 3W
presets are used for ground stacked configurations in either 3-way mode or with separate aux drive
(although 3WX presets can also be used). Please refer to Table 11 for guidelines concerning
subwoofer polarity depending on the selected preset and how subwoofers are processed.

L-Acoustics ARCS Specifications

General

Brand	L-Acoustics
Model	ARCS
Category	Speakers
Language	English