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
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
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
H
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)
S
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)
A
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.

WPV1

QRV4

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

QRV4

QDNT4D

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

QDNT4D

QDNT4DS – Dante Expansion Input Card (Switched, Dante, and AES67)

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.

QDNT4DS – Dante Expansion Input Card (Switched, Dante, and AES67)

QX AMPS SERIES

QX300

High Performance 2 x 150W Power Amplifier

Learn More

QX300D

High Performance 2 x 150W Power Amplifier with Dante/AES67

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QX4150

High Performance 4 x 150W Power Amplifier

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QX4300

High Performance 4 x 300W Power Amplifier

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QX4750

High Performance 4 x 750W Power Amplifier

Learn More

QX41500

High Performance 4 x 1500W Power Amplifier

Learn More