QX4300

High Performance 4 x 300W Power Amplifier

The Quest QX4300 is a professional 4 x 300W power amplifier housed in a 1U chassis, engineered for maximum performance in compact installations. Featuring advanced load sensing technology that automatically adapts to varying impedance conditions, the QX4300 delivers exceptional audio quality across its channels. Integrated high-pass and low-pass filters, limiters, and a rapid 1ms wake-up time from standby ensure precise control and efficient operation, making it suitable for complex multi-zone commercial and residential systems.

Key Specifications:

Channels: 4 x 300W (Low-Z & 70/100V)
Mounting: 1RU Rack
Optional: Dante/AES67 Version

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)	2200 W	4 x 550 W	4 x 550 W	4 x 550 W	4 x 550 W	2 x N/A	2 x N/A	2 x N/A	2 x N/A

NORMAL OPERATION (RMS)
Load	Total Power	8 Ω	4 Ω	70V	100V	8 Ω	4 Ω	70V	100V
Maximum Continuous Power (@ 1khz, 1% THD)	1120 W	4 x 280 W	4 x 260 W	4 x 250 W	4 x 240W	N/A	N/A	N/A	N/A

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 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	0.006% (1 kHz @ 1/8th Power / 8 Ω load)
DYNAMIC RANGE	104 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	4.8 W
POWER CONSUMPTION - IDLE	28 W
POWER CONSUMPTION - 1/8TH POWER / 8 Ω Load	150 W
POWER CONSUMPTION - 1/3RD POWER / 8 Ω Load	400 W

HEAT GENERATED - STANDBY	16.4 BTU/hr / 4.1 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 Ω Load	273 BTU/hr / 68 kJ per hour
COOLING	Fan-Forced Air Cooling – Temperature-Dependent
FAN NOISE (ANECHOIC CHAMBER @ 1 m)	38 dB(A)

RACK SIZE	1RU
DIMENSIONS (W x H x D)	482 x 44.5 x 344 mm (19 x 1.75 x 13.5")
WEIGHT	5.9 kg (11.7 lbs)
SHIPPING DIMENSIONS (W x H x D)	490 x 80 x 410 mm (19.3 x 3.1 x 16.1")
SHIPPING WEIGHT	8.3 kg (18.3 lbs)

ACCESSORIES (INCLUDED)	Mains Cable, Feet, User Manual, Euroblock/Phoenix Plugs
ACCESSORIES (AVAILABLE SEPARATELY)	Dante® 4CH Input Card (QDNT4D), Dante® 4CH Input Card with Switched Output (QDNT4DS), Volume Control Card (QVR4), Wall Plate Volume Control (WPV1)
OPTIONS	Dante® Expansion Card (additional 4 inputs, Dante® AoIP, AES67 compatible)

INSTALLATION ACCESSORIES

WPV1

Wall plate volume control for QX amplifiers with QRV4 card.

QRV4

Remote volume control card for QX Series amplifiers, used with WPV1 panel.

QDNT4D

Dante/AES67 expansion card for QX amps; adds four networked audio input channels.

QDNT4DS

The QDNT4DS is a switched Dante expansion input card designed for QX Series amplifiers. It supports both Dante and AES67 protocols and includes a spare switched output for cascading applications.