Product overview
XS-4 active

X Series

XS-4 active

The XS-4 active is a single 18" subwoofer with built-in class-D amplifier and Fohhn DSP. It provides optimal support to the speakers in the X, Linea, Arc and Focus series in the bass range. The powerful Sub is characterized by precise low-frequency reproduction, a high power rating and versatility.

Main features

  • 18" long excursion driver
  • Digital 1500 W class-D amplifier
  • SPL max.: 132 dB
  • 2 balanced signal inputs (XLR/jack plus link-out)
  • 2 × Speakon outputs for passive tops and additional sub
  • Built-in DSPs with speaker presets, EQ, delay, compressor/limiter, etc.
  • Control via intuitive control panel with display or Fohhn Audio Soft
  • High-quality wood enclosure (multiplex birch plywood)
  • Transport cover with 4 swivel castors included
  • Available in RAL Classic, NCS or Pantone colours on request
  • Optionally available with weatherproof PU coating
  • Lightweight, only around 39 kg


Technical data

Electroacoustic features

acoustic design
ATD acoustic design
1 × 18" long excursion, neodymium
maximum SPL
amplifier output
1500 W
frequency range
35 Hz – 130 Hz


multiplex birch plywood
front design
acoustic foam
thread plate for distance piece
protection grille
steel grille, ball impact resistant, powder-coated
approx. 39 kg
standard colours
textured paint, black
2 side handle
transport wheels
wheel board
dimensions (W × H × D)
approx. 590 × 600 × 680 mm

Optional features

optional weather protection
polyurethane coating, water-repellent speaker cone impregnation
optional colours
RAL Classic / NCS / Pantone on request

Electronic features

power supply
195 V – 250 V AC 50/60 Hz, max. 6A
temperature range
0 - 45°C
convection cooling, force cooling, if necessary termperature-controlled fan
weight (electronics)
approx. 1.8 kg power supply and amplifier


digital signal processors
independent limiters
selective 3-band limiting
bass / mid / high
band-specific time constants
filter technology
56-bit double precision
AD/DA 24 bit / 48 kHz
Select potentiometer, 4 buttons for DSP handling, ground/lift switch, Power on/off switch
indicator LEDs
4 line display, 2 × Signal/Clip LED, 2 × protect LED, receive/send remote LED

Remote control and remote monitoring

remote control
Fohhn Audio Soft, Fohhn-Net
remote monitoring
temperature, protect, signals


outputs (for recording or stacking)
2 × NL4 Neutrik Speakon for Top Speaker (stereo), from 130 Hz 2 × 4 ohms (stereo) or 1 × 8 ohms (bridge mode)
Input jack, 2 × XLR link jacks
2 × XLR/jacks, multifunctional input jacks
2 × Powercon mains jacks in and thru

integrated digital power amplifier

EIA amplifier power
2 × 750 W (1 kHz, THD+N < 1%)
bridge mode
1500 W
32 dB
input sensitivity
1.4 V
input impedance
10 kOhm
frequency response
20 Hz – 20 kHz
S/N ratio
>105 dBA
protective circuit
switch-on delay, soft start, impedance- and short-circuit protection, DC protect, temperature monitoring

power rating (nominal/program): according to IEC-60268-5 (long term/short term)
power rating (peak); maximum SPL: peak, 20 ms with bandpass filtered pink noise signal according to IEC 60268-2 at one octave above the lower limit of the frequency range
sensitivity: 2,83 V at 8 ohms (2 V at 4 ohms, 4 V at 16 ohms) at a distance of 1 m under anechoic fullspace conditions
frequency range: -10 dB under anechoic halfspace-conditions
weight: net weight without optional equipment
Intelligent Protection Circuit (IPC): voltage-controlled semiconductor circuit protecting the HF-driver against overload highly effective and with very short attack time
cut-off frequency: -10 dB under anechoic halfspace-conditions with speaker preset
heat dissipation: pink noise, 6 dB crest, 1/4 Pmax

Contact us

+49 7022 93323-0

Contact form
Close menu