QX4750

High Performance 4 x 750W Power Amplifier

The Quest QX4750 is engineered within a robust 2U rack-mount chassis to deliver 750W per channel, offering bridgeable outputs for both low-impedance and high-impedance configurations. Integrated HP/LP filters, limiters, and a rapid 1ms standby wake-up feature ensure precise signal processing and efficient operation, even in demanding commercial sound installations and multi-zone applications. Advanced Class D technology maintains exceptional dynamic range and minimal distortion for uncompromised audio fidelity.

Key Specifications:

Channels: 4 x 750W (Low-Z) or 2 x 1500W (Bridge Mono for Low-Z & 70/100V)
Mounting: 2RU 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)	3000 W	4 x 400 W	4 x 750 W	N/A	N/A	2 x 1500 W	2 x 1400 W	2 x 1500 W	2 x 1500 W

NORMAL OPERATION (RMS)
Load	Total Power	8 Ω	4 Ω	70V	100V	8 Ω	4 Ω	70V	100V
Maximum Dynamic Power (@ 1khz, 1% THD)	3000 W	4 x 400 W	4 x 750 W	N/A	N/A	2 x 1500 W	2 x 1400 W	2 x 1500 W	2 x 1500 W

I/O

OUTPUT CIRCUITRY	UMAC™ Class-D – full bandwidth PWM modulator with ultra-low distortion
OUTPUT CHANNELS	Four outputs on SpeakON Connectors
OUTPUT CHANNELS	Four outputs on SpeakON Connectors
INPUT CHANNELS	XLR Balanced Inputs and Euroblock Links
DEFAULT GAIN	32 dB
FREQUENCY RESPONSE	20 Hz to 20 kHz (±0.3 dB)
TOTAL HARMONIC DISTORTION	0.004% (1 kHz @ 1/8th Power / 8 Ω load)
DYNAMIC RANGE	111 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	powerCON
POWER CONSUMPTION - STANDBY	4.8 W
POWER CONSUMPTION - IDLE	28 W
POWER CONSUMPTION - 1/8TH POWER / 8 Ω Load	200 W
POWER CONSUMPTION - 1/3RD POWER / 8 Ω Load	533 W

HEAT GENERATED - STANDBY	16.4 BTU/hr / 4.1 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 Ω Load	205 BTU/hr / 51 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 Ω Load	205 BTU/hr / 51 kJ per hour
COOLING	Fan-Forced Air Cooling – Temperature-Dependent
FAN NOISE (ANECHOIC CHAMBER @ 1 m)	38 dB(A)

RACK SIZE	2RU
DIMENSIONS (W x H x D)	482 x 88 x 416 mm (19 x 3.5 x 16.4")
WEIGHT	10.2 kg (22.5 lbs)
SHIPPING DIMENSIONS (W x H x D)	610 x 135 x 550 mm (24 x 5.3 x 21.7")
SHIPPING WEIGHT	12 kg (26.5 lbs)

ACCESSORIES (INCLUDED)	Mains Cable, Feet, User Manual
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.