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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