S P A - 3 S P E C I F I C AT I O N S

S P A - 3

GENERAL INFORMATION

 

Operating temperature

0–70° C

Input type, each channel

Differential balanced (transformer balancing optional)

Input impedance

28.4 kΩ balanced, 14.7 kΩ unbalanced

Output impedance, main

95Ω, quasi-balanced

Maximum RMS output voltage

+18 dBu

Noise (0 dBr = maximum output)

-116 dBr

THD @ +4 dBu out

<0.01% @ 1 kHz

Frequency response

20 Hz–20 kHz, ±0.2 dB

Common-mode rejection

>50 dB minimum; >60 dB typical

Power requirements

+15V @ <300 mA, via external power jack, or from amplifier via pin 9 of DataPort

CONTROLS

 

Programming

Pushbutton switches for incremental programming: Shift, Up, and Down

INDICATORS

 

Attenuation (each channel)

2-digit 7-segment LED display

Signal presence (each channel)

Green LED

0.5 dB indicator (each channel)

Decimal point

CONNECTORS

 

Input (two channels)

5-pin “Euro-style” detachable terminal block

DataPort

HD15 male (to amplifier); HD15 female (to QSControl system)

External power

Coaxial jack

PROGRAMMABLE OPERATING PARAMETERS

 

Attenuation

0 to 32 dB in 0.5- or 1.0-dB increments

Bypass, Mute, or Lock

Either channel

Specifications subject to change without notice.

 

 

Operation

Press (n = Channel #)

 

 

 

 

 

 

 

 

Increase signal (decrease attenuation)

UPn

 

Signal

 

 

Increase signal (scroll)

Hold UPn

 

 

 

Decrease signal (increase attenuation)

DOWNn

 

LED

 

 

 

 

 

 

 

 

Digital

 

 

Decrease signal (scroll)

Hold DOWNn

 

Potentio-

 

 

 

 

 

 

meter

 

 

Bypass/engage attenuation (toggle)

SHIFTn + UPn

 

Input

 

 

Increment step toggle (1 or 0.5 dB)

SHIFTn + DOWNn

 

Stage

 

 

 

 

To amplifier,

 

 

 

 

 

Display firmware version

SHIFT1 + SHIFT2

 

 

 

via DataPort

Up

 

 

 

 

 

Output

 

Mute/unmute Channel 1

SHIFT2 + UP1

 

 

 

Mute/unmute Channel 2

SHIFT1 + UP2

Down

½ Micro-

Stage

 

 

 

 

 

 

Lock/unlock Channel 1

SHIFT2 + DOWN1

 

controller

 

 

 

 

 

 

 

 

 

 

 

Lock/unlock Channel 2

SHIFT1 + DOWN2

Shift

8.8.

2-Digit

 

 

 

 

Display

 

 

 

 

 

7-Segment

 

 

 

Block diagram of SPA-3 (one channel shown)

Mounting the SPA-3 to a two-channel

CX, DCA, or PL2 amplifier

QSC Audio Products, Inc. 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 General Information, Controls, Indicators, Connectors
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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.
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