•  Loudspeaker amplification, 96 kHz/24 bit DSP, Ethernet network
•  4 channel class-I power-amplifier (analogue or AES/EBU input)
•  4 x 2500 watt into 2.7 ohm.
•  Front panel user with LCD display and LED meters for input and output signal
•  Comprehensive APIA Factory preset library
•  Rigging optional accessories
•  Internal DSP module and APNET Apia software via Ethernet
•  3U lightweight format for high amplified density

At the heart of the APIA PRO AUDIO® integrated system approach, the QDX-13 amplified controller offer cutting edge loudspeaker amplification, DSP, network control, and comprehensive system protection in a single ergonomic package. Based on similar platforms, the exceptional and ground-breaking performance level delivered by the QDX-13 unit allow full optimization of the resources of all APIA PRO AUDIO® systems and deliver outstanding audio quality combined with the best possible transducer protection. The QDX-13 share the following characteristics:
A 3U lightweight format for high amplified density.
A four-channel high efficiency amplifier section fed by four inputs.
An on-board preset library to cover all the principal APIA PRO AUDIO® loudspeaker system configurations. An intuitive and ergonomic user interface, fully accessible from the front panel for standalone operation. Two I/O Ethernet ports for networking up to 253 QDX-13 unit, remote-monitored by APNET NETWORK MANAGER software (Windows® compatible).
And the specific features of each unit are the following:

The QDS-13 delivers up to 4 x 2500 watt into 2.7 ohm.
An AES/EBU input card is integrated to the QDX for digital audio implementation. The QDX-13 includes all current factory presets..
The output connectors are SpeakON® for the QDS-13 CA-COM®/SpeakON®. The unique ensemble of on-board features and the addition of peripherals are all offered in a secured and standardized environment. This approach simplifies system setting and operation with the benefit of superior and predictable audio results across the entire product range.
Driving four amplified output channels through a DSP offers a wide range of options when it comes to sound system configuration. The QDS-13 on-board preset libraries allow the sound engineer a high degree of flexibility in choosing the enclosure models and the system configuration for a specified application. Built for touring applications but as well for system integrators, the QDX-13 series amplifiers provide multi-channel amplification with built-in DSP and enough power to drive wide varieties of APIA speaker systems with optimal energy efficiency. The QDX-13 is a four-channel amplifier with on-board DSP and flexible channel combining. The amplifier QDX-13 not only provide the power and processing to make your system perform better, it offer outstanding efficiency ensuring that energy costs are kept to a minimum over the life of the installation. The QDX-13 amplifier use Apia’s latest-generation class-I power-amplifier. With four channels of amplification plus signal processing in just 3RUs, the QDX-13 series replaces equipment taking up as much as three times the rack-space. A single QDX-13 is a capable and sophisticated loudspeaker processor. Integration of processing and amplification means that the DSP knows exactly what the amplifier is doing so dynamics processing can be far more accurate and effective. This approach employs both RMS and Peak Limiters that allow the amplifier and loudspeaker to produce more output without being pushed to distortion or destruction. The proprietary algorithms allow optimum performance and protection of each individual transducer of the APIA PRO AUDIO® systems for an even more natural, transparent, and realistic sound experience. The DSP engine is a 32-bit floating point DSP at 96 kHz sampling rate offering an enhanced dynamic range since it does not generate calculation clips like a fixed point DSP. A dedicated engineering approach combining IIR and FIR filters generates perfectly linearized phase curves and significantly improved impulse responses. The 2 x 4 matrix architecture offers flexibility for various system configurations. The AP-DRIVE transducer protection system offers advanced protection by monitoring both excursion and temperature of the transducer. With a complete factory preset library and the possibility of creating additional user presets, the flash memory offers a quick access to all the usual APIA speaker system configurations (refer to the APIA-PRESET GUIDE).

The QDX-13 also includes recommended presets for all the Apia’s loudspeakers. With a dedicated front panel user interface, complete with LED meters for input and output signal and mute indicators, a 2×24 character LCD display with blue LED backlight, a rotary encoder, and navigation buttons, the QDX-13 amplifier provide an intuitive means to control the system. The design of complex systems is made possible by the integration of the AP-NET Ethernet-based network. Thanks to its high speed data transfer protocol of 100 Mbit/sec, up to 253 units (QDX-13) can be controlled and monitored in real-time from AP-NETWORK MANAGER software.
Multiple network topologies such as daisy-chain, star, and hybrid are quickly and easily configurable for full flexibility in the required system architecture. The computer running APNET NETWORK MANAGER and the units are connected to each other using industry standard CAT5e U/FTP cables (or higher category) fitted with RJ45 connectors. Each amplified controller connects to the network via the I/O Ethernet sockets located on its rear panel.


Controls and indicators

POWER Mains power switch
SCROLL/EDIT Digital rotary encoder
Display 2×24 character LCD display with blue LED backlight

Digitial Signal Processing

Latency analog and digital inputs 0.3 msec.
Delay setting 0.3 – 10000 msec.
Configurations current APIA loudspeakers
Frequency generator Pink noise
Sampling rate 96 kHz/24 Bit ADC/24 Bit DAC


INPUT ANALOG (IN1 – IN4) 3 pin XLR female
ANALOG LINK (OUT1 – OUT4) 3 pin XLR male
INPUT DIGITAL (D1/2) 3 pin XLR female AES 3
DIGITAL LINK (Output) 3 pin XLR male
Sampling Digital AES/EBU 48 kHz/96 kHz
OUT Channel 1/2/3/4 NL4
USB USB type B connector
ETHERNET RJ45 for Ethernet connection (10/100 TCP-IP)

Data (linear setting with subsonic filter)

Maximum output power per channel (THD + N < 0.5 %, all channels driven)
CF = 6 dB at 8 ohms 4 x 1300 W
CF = 6 dB at 4 ohms 4 x 2100 W
CF = 6 dB at 2 ohms 4 x 2500 W
S/N ratio (unweighted, RMS)
Analog input > 110 dBr
Digital input > 114 dBr

Power supply

Rated mains voltage
High range 208 to 240 V, 50 – 60 Hz
Low range 100 to 127 V, 50 – 60 Hz

Dimensions, weight

Height x width x depth 134 x 483 x 477 mm
5.2 x 19 x 18.7
Weight 19 kg
41 Ib

Accessories for QDX-13:

•  AC-PLA (Dolly AC-RACK)

Downloads / Support
User Manual

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Data Sheet

Download the Datasheet of the selected product for all technical informations

Preset Pack

This zipped Package includes the preset-pack for the QDX-13 Amplifier and preset-pack for other brands of amplifiers.

Others Downloads

Go to document pages where you can download Apia's Cad files, Drawing files, rigging and configuration sheet about all our products.