ESX QXB8A active subwoofer

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active bass-reflex subwoofer, Ø 8\", 400 W RMS, remote control
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Active subwoofer ESX QXB8A

The ESX QUANTUM QXB208A active subwoofer is the ideal solution for those who want to significantly strengthen the bass section of their audio system without the need for an external amplifier. With a built-in Class D amplifier delivering 400 W RMS, it offers substantially higher power than many common active subwoofers that often use less powerful or outdated amplifiers. The modern POWER4 amplifier module achieves up to 84% efficiency, ensuring high output with minimal heat losses. The subwoofer includes technologies that enable trouble-free installation even in the newest vehicles. Thanks to the EPS® PRO system, adjustable input sensitivity and intelligent automatic turn-on function, it is compatible with modern OEM head units and vehicles equipped with Start-Stop systems. The package also includes a wired remote bass level control, allowing convenient adjustment from the driver’s seat. The robust bass-reflex enclosure is fitted with a protective grille and the manufacturer also includes mounting feet that allow the subwoofer to be easily converted to a downfire configuration with the driver pointing downward. This solution is ideal, for example, for installation into dual-floor trunks.

Main features

Active bass-reflex subwoofer with an 8\" (200 mm) driver.
Built-in POWER4 Class D amplifier.
Power 400 W RMS / 800 W peak.
Low-pass crossover 40–120 Hz / 12 dB.
Phase switch 0° / 180°.
Bass Boost 0–6 dB at 45 Hz.
RCA low-level input.
High-level input for connection to factory head units.
Automatic turn-on via DC offset or audio signal detection.
Compatible with Start-Stop systems (operational down to 7 V for up to 5 seconds).
EPS® PRO technology (10R / 150R / 600R).
Switchable input sensitivity 15 V or 40 V.
Triple limiter protection with clipping indication via LED.
Wired remote bass level control.
Robust compact enclosure with protective driver grille.
Includes mounting feet for downfire installation.
Dimensions: 48 × 33 × 18 cm.

Catalog number	QXB8A
Brand	ESX
Links	Official web presentation
The diameter of the subwoofer usedThe diameter of the subwoofer that is installed in the active box.	8\" (200 mm)
RMS power of the amplifier	400 W
Energy class of the amplifierAmplifiers are divided into two basic classes: analog and digital . Analog amplifiers (A/B) have higher consumption requirements, but usually have a more natural sound. Digital amplifiers (D) have significantly lower consumption and higher efficiency, but the sound may not be as faithful as with classic analog amplifiers.	D
Low-pass filter (LPF)	40 – 120 Hz
Bass boost functionBass boost or bass enhancement. With this function, the bass itself can be emphasized, at a high level of bass boost, the speakers and the subwoofer can distort a lot and the sound will be worse than better. We therefore recommend using the "bass boost" function wisely.	0 – 6 dB
Phase rotation optionPhase shift is a linear electronic oscillator that produces a sinusoidal output. It consists of an inverting part of the amplifier such as a transistor. The feedback network "shifts" the phase at the output of the amplifier by 180 degrees to the oscillation frequency and gives positive feedback. The Phase shift filter produces a phase shift that increases with increasing frequency. This is usually used when the subwoofer sub-assembly is out with the magnet, or when two amplifiers are connected externally. Phase Shift is also used with active speaker wiring, where the time shift of the speakers is set. The point is that the subwoofer does not play the bass late, and for this reason better amplifiers offer this phase reversal option.	0° / 180°
Other	Yes
High level inputThe high-level input on the active subwoofer enables connection directly to the speakers in the car without purchasing an external high/low converter. Use in the case of mounting an active subwoofer on the original car radio.	Yes
Automatic on and offThis function will facilitate your installation and solve the problem of finding a remote signal, which is sometimes a problem with original car radios. The active subwoofer with the Auto sense function can recognize that the equipment in the car is active and turn itself on. A useful and practical feature.	Yes
Remote control included in the packageSome models of active subwoofers also have wired remote controls in the package, which on the one hand connect to the active box, and on the other hand you have a potentiometer that you can place anywhere in the cabin. A common place to place the remote control is under the steering wheel. The advantage is the regulation of power, and therefore volume, depending on driving conditions and the mood of the crew in the car.	Yes
Loudspeaker type	Bass-reflex
Active subwoofer dimensions	480 x 330 x 180 mm