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

INSTALLATION ACCESSORIES

uRAK2

1RU rack mount for up to three QX300A/D amplifiers.

uRAK2

uRAK3

3RU rack mount for up to ten QX300A/D amplifiers.

uRAK3

WBQX300

Wall/desk mount bracket for discreet QX300A/D amplifier installation.

WBQX300

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