QX300

High Performance 2 x 150W Power Amplifier

The Quest QX300 is a high-performance 2 x 150W power amplifier engineered for versatile installation applications. Utilizing advanced UMAC™ Class-D technology, it offers exceptional efficiency and intelligent auto load sensing for both Low-Z and High-Z configurations. Its compact design supports wall or table mounting and high-density installation with up to 10 units per 3RU rack space. Robust construction—including a diecast base and comprehensive protection circuits—ensures reliable operation in demanding environments, making the QX300 a dependable solution for professional audio systems.

Key Specifications:

Channels: 2 x 150W (Low-Z) or 1 x 300W (Bridge Mono for Low-Z & 70/100V)
Mounting: Wall/Table
Rack Density: 10 units per 3RU

SPECIFICATIONS

POWER

NORMAL OPERATION (PEAK)
Load	Total Power	8 Ω	4 Ω	70V	100V	8 Ω	4 Ω	70V	100V
Maximum Dynamic Power (@ 1khz, 1% THD)	1100 W	4 x 200 W	4 x 275 W	N/A	N/A	2 x 550 W	2 x 550 W	2 x 550 W	2 x 550 W

NORMAL OPERATION (RMS)
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 140 W	N/A	N/A	2 x 280 W	2 x 260 W	2 x 250 W	2 x 240 W

I/O

OUTPUT CIRCUITRY	UMAC™ Class-D – full bandwidth PWM modulator with ultra-low distortion
OUTPUT CHANNELS	Two Speaker Level Output via 2-pin Euroblock/Phoenix connector with 5.08 mm pitch and screw-lock
INPUT CHANNELS	Two Analogue Balanced Line Level Inputs via 3-pin Euroblock/Phoenix connector with 5.08 mm pitch and screw-lock
DEFAULT GAIN	32 dB
FREQUENCY RESPONSE	20 Hz to 20 kHz (±0.3 dB)
TOTAL HARMONIC DISTORTION	0.003% (1 kHz @ 1/8th Power / 8 Ω load)
DYNAMIC RANGE	112 dB (A-weighted)
MAXIMUM INPUT LEVEL	'+24 dBu
INPUT IMPEDANCE	10kΩ
LATENCY	N/A

CONTROLS AND INDICATORS (FRONT)	Per Channel: Volume Potentiometer, 80 Hz HPF Switch, 100 Hz LPF Switch, Bridge-Mono Switch, Limiter Switch and Auto-Standby Switch
CONTROLS AND INDICATORS (REAR)	N/A
CONTROL AND MONITORING	N/A
DIGITAL SIGNAL PROCESSING	N/A
PROTECTION CIRCUITS	Thermal protection, Over-Current Protection, DC Protection, HF Protection

MAINS POWER INPUT	Universal Mains, 100-240V, 50-60 Hz
MAINS CONNECTOR	Standard IEC C14
POWER CONSUMPTION - STANDBY	0.4 W
POWER CONSUMPTION - IDLE	7.2 W
POWER CONSUMPTION - 1/8TH POWER / 8 Ω Load	38 W
POWER CONSUMPTION - 1/3RD POWER / 8 Ω Load	100 W

HEAT GENERATED - STANDBY	1.4 BTU/hr / 0.3 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 Ω Load	43 BTU/hr / 11 kJ per hour
COOLING	Fan-Forced Air Cooling – Temperature-Dependent
FAN NOISE (ANECHOIC CHAMBER @ 1 m)	38 dB(A)

RACK SIZE	1RU High and 1/3-Rack Width
DIMENSIONS (W x H x D)	125 x 44.5 x 330 mm (5.5 x 1.75 x 13")
WEIGHT	1.6 kg (3.5 lbs)
SHIPPING DIMENSIONS (W x H x D)	250 x 80 x 420 mm (9.8" x 3.15" x 16.5")
SHIPPING WEIGHT	3 kg (6.6 lbs)

ACCESSORIES (INCLUDED)	Mains Cable, Feet, User Manual, Euroblock/Phoenix Plugs, Rack Ears
ACCESSORIES (AVAILABLE SEPARATELY)	uRAK2, uRAK3 and WBQX300
OPTIONS	Dante Version Available - QX300D