QX4750
High Performance 4 x 750W Power AmplifierThe 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 Stereo for Low-Z & 70/100V)
- Mounting: 2RU Rack
- Optional: Dante/AES67 Version
SPECIFICATIONS
POWER (PEAK)
Total Power
3000 W
Normal Operation
8Ω
4 x 400W
4Ω
4 x 750W
70V
N/A
100V
N/A
Bridge-Mono Mode
8Ω
2 x 1500W
4Ω
2 x 1400W
70V
2 x 1500W
100V
2 x 1500W
POWER (RMS)
Total Power
3000 W
Normal Operation
8Ω
4 x 400W
4Ω
4 x 750W
70V
N/A
100V
N/A
Bridge-Mono Mode
8Ω
2 x 1500W
4Ω
2 x 1400W
70V
2 x 1500W
100V
2 x 1500W
I/O
OUTPUT CIRCUITRY
UMAC™ Class-D – full bandwidth PWM modulator with ultra-low distortion
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 ohm load)
DYNAMIC RANGE
111 dB (A-weighted)
MAXIMUM INPUT LEVEL
+24 dBu
INPUT IMPEDANCE
10kohm
LATENCY
N/A
CONTROL
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
ELECTRICAL
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 ohm Load
200 W
POWER CONSUMPTION - 1/3RD POWER / 8 ohm Load
533 W
HEAT
HEAT GENERATED - STANDBY
16.4 BTU/hr / 4.1 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 ohm Load
205 BTU/hr / 51 kJ per hour
COOLING
Fan-Forced Air Cooling – Temperature-Dependent
FAN NOISE (ANECHOIC CHAMBER @ 1 m)
38 dB(A)
SIZE
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
ACCESSORIES (INCLUDED)
Mains Cable, Feet
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)
| Maximum Dynamic Power (@ 1kHz, 1% THD) (PEAK) |
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| Maximum Continuous Power (@ 1kHz, 1% THD) (RMS) |
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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.
