QSC Audio SPA-3 Benutzerhandbuch

1675 MacArthur Boulevard
Costa Mesa, CA 92626
Ph: 800/854-4079 or 714/957-7100
Fax: 714/754-6174
www.qscaudio.com

SPA-3

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.

• 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)

• 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