QXD-2K

4 x 300W DSP Enabled Power Amplifier

The QXD2K is a compact 1RU, 4 x 300W Class-D amplifier designed for high-output installation environments. Operating at 8 Ω, 4 Ω, 70V, or 100V, it features UMAC™ Class-D technology for ultra-low distortion, high efficiency, and precise full-bandwidth performance. With onboard 32bit/96kHz DSP, it offers FIR/IIR filtering, RMS and peak limiters, and integration of Quest’s custom speaker libraries. The QXD2K includes a front-panel TFT display with rotary encoder, along with RJ45 and GPIO for external control and monitoring. Universal mains compatibility and fan-assisted temperature-dependent cooling ensure reliable operation under demanding conditions. Optional Dante™/AES67 support is available via expansion card, providing seamless integration into networked AV systems.

Key Specifications:

Channels: 4 x 300W (Low-Z, 70V, or 100V)
DSP: 32bit/96kHz FIR/IIR Filters, Limiters, Speaker Libraries
Mounting: 1RU Rack
Control: RJ45 & GPIO, Front TFT Display
Options: Dante™/AES67 Expansion Card

SPECIFICATIONS

POWER

NORMAL OPERATION (PEAK)					Bridged-Mono Mode (Peak)
Load	Total Power	8 Ω	4 Ω	70V	100V	8 Ω	4 Ω	70V	100V
Maximum Dynamic Power (@1kHz, 1% THD)	1000 W	4 x 250 W	4 x 250 W	N/A	N/A	2 x 500 W	2 x 500 W	2 x 500 W	2 x 500 W

NORMAL OPERATION (RMS)					Bridged-Mono Mode (Peak)
Load	Total Power	8 Ω	4 Ω	70V	100V	8 Ω	4 Ω	70V	100V
Maximum Continuous Power (@1kHz, 1% THD)	600 W	4 x 150 W	4 x 150 W	N/A	N/A	2 x 300 W	2 x 300 W	2 x 300 W	2 x 300 W

I/O

OUTPUT CIRCUITRY	UMAC™ Class-D – full bandwidth PWM modulator with ultra-low distortion
OUTPUT CHANNELS	Four Speaker Level Output via 2-pin Euroblock/Phoenix connector with 5.08 mm pitch and screw-lock
INPUT CHANNELS	Four Balanced Line Level Inputs via 3-pin Euroblock/Phoenix connector with 5.08 mm pitch and screw-lock
DEFAULT GAIN	25 dB
FREQUENCY RESPONSE	20 Hz - 20 kHz (±0.25 dB), 4 Hz - 40kHz (-3dB)
TOTAL HARMONIC DISTORTION	< 0.008% (1 KHz, 5 W, 8 Ω load)
DYNAMIC RANGE	> 103 dBA
MAXIMUM INPUT LEVEL	+28 dBu
INPUT IMPEDANCE	10kΩ Unbalanced, 20kΩ Balanced
LATENCY	<350 μs, flat setup

CONTROLS AND INDICATORS (FRONT)	High-Resolution TFT Display, Encoder with LED Halo
CONTROLS AND INDICATORS (REAR)	N/A
CONTROL AND MONITORING	RJ45 & GPIO
DIGITAL SIGNAL PROCESSING	32bit/96 kHz with FIR/IIR Filters, Peak and RMS Limiters, Custom Quest Speaker Libraries
PROTECTION CIRCUITS	Thermal Protection, Over-Current Protection, DC Protection, HF Protection

MAINS POWER INPUT	Universal Mains, 100-240VAC, 50-60 Hz
MAINS CONNECTOR	Standard IEC C14
POWER CONSUMPTION - STANDBY	<0.5W
POWER CONSUMPTION - IDLE	16 W
POWER CONSUMPTION - 1/8TH POWER / 8 Ω Load	120 W
POWER CONSUMPTION - 1/3RD POWER / 8 Ω Load	270 W

HEAT GENERATED - STANDBY	1.7 BTU/hr / 1.7 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 Ω Load	154 BTU/hr / 159 kJ per hour
COOLING	Fan-Forced Air Cooling – Temperature-Dependent
FAN NOISE	34 dB(A) (Anechoic Chamber, @ 1 m)

RACK SIZE	1RU
DIMENSIONS (W x H x D)	482 x 44 x 344 mm (19" x 1.75" x 13.5")
WEIGHT	5.3 kg (11.7 lbs)
SHIPPING DIMENSIONS (W x H x D)	610 x 90 x 480 mm (24" x 3.5" x 19")
SHIPPING WEIGHT	7.5 kg (16.5 lbs)

ACCESSORIES (INCLUDED)	Mains Cable, User Manual, Euroblock/Phoenix Plugs, Wi-Fi Antenna
ACCESSORIES (AVAILABLE SEPARATELY)	Rear Rack Ears
OPTIONS	Dante® Expansion Card (additional 4 inputs, Dante® AoIP, AES67 compatible)