QX4150

High Performance 4 x 150W Power Amplifier

The Quest QX4150 is a professional-grade 4 x 150W power amplifier housed in a compact 1U rack-mount chassis. Designed to deliver consistent performance across multiple channels, it provides 150W per channel into both 4 Ω and 8 Ω loads. Bridgeable outputs, integrated high-pass and low-pass filters, and a rapid 1ms standby wake-up time ensure precise signal processing and reliable operation in multi-zone systems. Its sophisticated design and robust construction make the QX4150 an ideal choice for commercial sound installations and high-end residential applications.

Key Specifications:

Channels: 4 x 150W (Low-Z) or 2 x 300W (Bridge Mono for 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)	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	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	3.8 W
POWER CONSUMPTION - IDLE	16 W
POWER CONSUMPTION - 1/8TH POWER / 8 Ω Load	75 W
POWER CONSUMPTION - 1/3RD POWER / 8 Ω Load	200 W

HEAT GENERATED - STANDBY	13 BTU/hr / 3.2 kJ per hour
HEAT GENERATED - 1/8TH POWER / 8 Ω Load	154 BTU/hr / 38 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	5.3 kg (11.7 lbs)
SHIPPING DIMENSIONS (W x H x D)	SHIPPING DIMENSIONS (W x H x D)
SHIPPING WEIGHT	7.5 kg (16.5 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 – 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.