PERFORMANCE ACCESSORIES
1675 MacArthur Boulevard
Costa Mesa, CA 92626
Ph: 800/854-4079 or 714/957-7100
Fax: 714/754-6174
www.qscaudio.com
SPA-3
Stereo Precision Attenuator
Basic Description
The SPA-3 is an externally mounted two-channel precision attenuator
accessory for DataPort-equipped QSC amplifiers. With pushbutton pro-
gramming and digital gain control, it offers precise, secure, and repeat-
able attenuation settings from 0 to 32 dB. It features optional input iso-
lation transformers custom-made for QSC by Jensen, providing superb
common-mode noise rejection for high-performance sound systems.
The SPA-3 mounts directly to the rear panel of two-channel CX, DCA,
and PowerLight 2 Series amplifiers. For use with four-channel models or
with PowerLight amplifiers, the accessory can be mounted on an acces-
sory rack-mount panel and connected to the amplifier via a VGA-type
extension cable (with pin 9). See below for a more detailed list.
Compatible amplifier models
•Two-channel CX, DCA, and base PL2 models
•Four-channel CX and DCA models (via connecting cable)
•ISA models
•PowerLight models (via DPX-2 connecting cable and with DPX-1
external power supply; use DPX-4 accessory mounting bracket)
Features
•Precisely attenuates signal up to 32 dB in increments as small as 0.5 dB
•Selectable increment scaling: 0.5 or 1 dB
•Low-noise, low-distortion, high-performance digital gain controls
•DataPort connectivity
•Balanced “Euro-style” inputs
•Optional high-performance input transformers to precisely balance
and isolate amplifier inputs for superb noise rejection
•Channels can be independently muted, bypassed, or locked
•Easy to install
Specifications subject to change without notice.
SPA-3, shown with optional XF-1
transformers installed
