QSC Audio SF-3 - Manual

P E R F O R M A N C E A C C E S S O R I E S
1675 MacArthur Boulevard
Costa Mesa, CA 92626
Ph: 800/854-4079 or 714/957-7100
Fax: 714/754-6174
www.qscaudio.com
SF-3
Subwoofer Filter
Basic Description
The SF-3 subwoofer filter allows the addition of subwoofers to an
existing full-range system, offering adjustable low-pass filtering and
high-pass subsonic filtering with optional B6 boost and mono-summing.
The unit mounts to the rear panel of a two-channel DCA or CX amplifiers
to save cost and rack spack. The amplifier’s DataPort provides the
accessory’s operating power and receives the output signals, eliminating
added external wiring or power transformers.
For subwoofer material derived from full-range audio, a 4 th -order
Linkwitz-Riley low-pass filter lets you set the upper range of the sub-
woofer band to 80, 150, or 250 Hz. The subsonic filter offers a range of
roll-off frequencies from 20 to 50 Hz to protect subwoofers from over
excursion, with optional equalization to extend the response of B6
speaker enclosures. A trim control provides 0 to 20 dB of attenuation
for matching levels among the various frequency bands. Filter fre-
quencies are programmable via provided SIP resistor networks.
Compatible amplifier models
DCA 1222, DCA 1622, DCA 2422, DCA 3022, and DCA 3422
CX 302, CX 502, CX 702, CX 902, CX 1102, CX 302V, CX 602V, and CX 1202V
SF-3 Features
• For 2-channel DCA series or CX series amps
• Designed for professional cinema applications or installed
sound systems
• Mounts directly to back of amplifier; interfaces with amplifier
via DataPort
• Adds low-pass and subsonic filtering functions without requiring
additional rack space, cabling, or AC outlets
• Precision components for accurate performance
• Active balanced XLR inputs
• Selectable subsonic frequencies from 20 Hz to 50 Hz
• Defeatable 24 dB/octave low-pass filter for deriving subwoofer
program from mono or stereo full-range audio
OFF
ON
1 2 3 4 5 6 7 8 9 10
DCA amplifier SF-3
subwoofer filter
Ch. 1
Ch. 2
Cinema processor
subwoofer output
or full-range audio
SF-3 Spec Sheet.11/7/00