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ESX Quantum QS-TWO-BT 2-Channel Class D Nano Digital Amplifier with Bluetooth Receiver

The ESX Quantum QS-TWO-BT is an ultra-compact 2-channel Class D "nano" amplifier equipped with a built-in Bluetooth 5.0 receiver dedicated to high-definition wireless music streaming. Designed for stealth installations, classic cars, or OEM system upgrades, this powerful miniature amplifier delivers up to 190 Watts RMS without needing a bulky chassis or an aftermarket head unit.

Equipped with automatic signal detection, the amplifier automatically switches to Bluetooth audio streaming as soon as playback starts on your phone, seamlessly overriding the wired input source. Once streaming stops, it automatically reverts back to the main input. An external screw-on Bluetooth antenna is included to guarantee reliable reception even when mounted hidden behind dashboard panels.

Features:

Ultra-compact Class D nano design with heavy cast iron heat sink for optimal heat dissipation.
Integrated Bluetooth V5.0 receiver dedicated to high-definition wireless audio and music streaming (A2DP). Note: Audio streaming only; does not support hands-free phone calls.
Automatic source selection that prioritises Bluetooth streaming over wired inputs.
Hardware BT GAIN jumper (-3 dB / 0 dB / +3 dB) for signal level matching.
High-level inputs with EPS (Error Protection System) for seamless compatibility with factory head units.
Auto power-on function via DC offset or VOX (signal sensing).
Start/stop vehicle electrical system compatible (7.3V to 16.4V operating range).
Switchable High Pass or Low Pass crossover filter fixed at 80 Hz (12 dB/octave).
RCA low-level inputs and pass-through stereo RCA outputs for connecting external active subwoofers.
External Bluetooth antenna included for optimum signal coverage.

Specifications:

General

Power Output (RMS @ 13.8 V): 2 x 52 Watts @ 4 Ohms
Power Output (RMS @ 13.8 V): 2 x 95 Watts @ 2 Ohms
Bridged Output (RMS @ 13.8 V): 1 x 190 Watts @ 4 Ohms
Loudspeaker Impedance: 2 - 8 Ohms
Input Sensitivity: 220 mV - 5.4 V
Bluetooth Profile: A2DP (wireless music streaming only, no hands-free phone calling)
Frequency Response: 10 Hz - 60 kHz
Total Harmonic Distortion (THD+N @ 5W/RMS): less than 0.016%
Damping Factor: 140
Signal-to-Noise Ratio: 100 dB
Efficiency: up to 90%
Operating Voltage: 7.1V - 15.9V DC
External Fuse: 20 A
Dimensions: 90 x 35 x 70 mm

Connections & Controls

Low-Level Inputs: RCA via harness connector (220 mV - 5.4 V)
High-Level Inputs: Speaker wire harness with EPS - Error Protection System
Low-Level Outputs: Stereo RCA via harness connector
Speaker Impedance Range: 2 - 8 Ohms (stereo) / 4 - 8 Ohms (bridged)
Crossover: Switchable FULL / HP 80 Hz / LP 80 Hz
Auto Turn-On Switch: OFF / VOX / DC

Supplied Parts

ESX QS-TWO-BT main amplifier unit
Power connection plug and external fuse holder with fuse
Speaker output harness (4-pin connector)
Low-level RCA input/output harness (8-pin connector)
High-level input wire harness with EPS
Screw-on Bluetooth antenna
Mounting screws and owner's manual