P E R F O R M A N C E A C C E S S O R I E S

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

1675 MacArthur Boulevard Costa Mesa, CA 92626

Ph: 800/854-4079 or 714/957-7100

Fax: 714/754-6174 www.qscaudio.com

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QSC Audio SPA-3 specifications Basic Description, Compatible amplifier models, Features

SPA-3 specifications

QSC Audio SPA-3 is an innovative power amplifier designed to meet the demanding needs of modern audio applications. With its compact design and advanced technology, the SPA-3 offers a powerful solution for professional audio engineers, venue operators, and like-minded enthusiasts.

One of the standout features of the SPA-3 is its versatility. This three-channel amplifier has a power output of up to 300 watts per channel at 4 ohms, making it suitable for a range of applications from small venues to larger installations. The SPA-3 can be used in various configurations, including stereo, mono bridge, or even as a multi-channel solution, allowing users to tailor their audio setup to their specific requirements.

The SPA-3 utilizes advanced Class D technology, ensuring high efficiency and low power consumption while still achieving impressive sound quality. The lightweight design not only simplifies transportation and installation but also minimizes heat generation, leading to enhanced reliability during extended use. The amplifier incorporates QSC’s proprietary DSP, which enables users to take advantage of features such as customizable EQ settings, delay adjustments, and limiter functions to optimize audio performance for any environment.

Connectivity is another strong point of the QSC SPA-3. The amplifier is equipped with balanced XLR and 1/4-inch TRS inputs, as well as binding post speaker outputs, providing flexibility for various audio sources and speaker types. Additionally, the amplifier features a comprehensive front-panel interface, which includes status LEDs for power, signal, and clipping indications, allowing users to easily monitor performance and troubleshoot any issues.

Durability is a hallmark of QSC products, and the SPA-3 is no exception. The amplifier is housed in a sturdy, rugged chassis designed to withstand the rigors of live performance and installation environments. It also features comprehensive protection circuitry, including over-temperature, short-circuit, and DC protection, ensuring both safety and longevity for the unit and connected speakers.

In summary, the QSC SPA-3 is a powerful, versatile, and efficient amplifier suited for a variety of professional audio applications. With its advanced Class D technology, customizable DSP features, flexible connectivity options, and robust design, the SPA-3 stands out as an exceptional choice for anyone looking to elevate their audio experience.