$ 4,120.00

As consumer technology advances at ever faster rates, professional technology increasingly finds itself trying to keep up. An example of this is the advent of the Blu-ray and other high definition formats that have increased the audio channel count to 7.1.


The KH 870 is an answer to these new demands by offering a new 7.1 High Definition Bass Manager™ This is compatible with all standard consumer formats from mono through to the latest 7.1 HD systems. Eight channels of analog inputs ensures flexible interconnectivity for modern studios. Four-mode LFE-channel processing guarantees compatibility across all formats and industries. Forth-order crossovers and flexible acoustical controls allow for seamless system integration. Built-in volume control and a hardware remote control allows for centralized system control independent of the source, and the electronics can be remote located to reduce cabling


The latest amplifier technology and acoustical components have been used to ensure the most accurate sound reproduction possible. Robust drivers, a rock-solid cabinet, and carefully designed ports guarantee a tight, articulate, and distortion-free low frequency reproduction, even at high replay levels. Using the sum output, Plane Wave Bass Array™ (PWBA™) techniques acoustically improves lateral consistency in the listening area. The bass extends down to 18 Hz.


The KH 870 subwoofer is designed to complement our extensive range of monitors, and can be used on its own, or daisy-chained to make larger systems capable of higher SPL. The KH 870 can be used in music, broadcast, and post production studios for tracking, mixing, and mastering. The cabinet can be positioned next to a wall or flush mounted into a wall due to the front mounted port, and can be mixed freely in multichannel systems with other loudspeakers from our range – Product Selection Guide





Flexible electronics

  7.1 Channel High Definition Bass Management™ compatible with all formats from mono to 7.1
  Bypassable 4th order 80 Hz active crossover for maximum compatibility with consumer reproduction
  0 and +10 dB LFE gain and 4-mode LFE processing:
  LFE to subwoofer and left/right
  LFE to subwoofer only up to 80 Hz
  LFE to subwoofer only up to 120 Hz
  LFE to subwoofer with no filtering – for daisy chaining subwoofers and external signal processing systems
  Independent control of bass management for front and back channels
  System wide volume control via optional hardware remote controls or RS-232
   Acoustical controls adapt the subwoofer’s response to the environment
  Output level
  Low cut
  Parametric equalizer
  45° step phase control with a built-in test signal


  Larger systems and Plane Wave Bass Arrays™ maybe constructed using the Sum output
  Remoteable electronics (REK 3 and an SC nn) for installation convenience, less cabling, and convenience of use
  Integrated electronic limiter for amplifier and driver protection
  Low heat dissipation amplifiers
  Electronics can be remotely powered on with two modes of operation (0 V and 12 V trigger)

Robust drivers and cabinet



  Low frequency extension for main loudspeakers down to 18 Hz
  Low distortion magnetically shielded long-throw drivers
  Reduced bass compression at high SPL from generously proportioned bass reflex ports

Large system with 6 dB higher output than KH 810


A main loudspeaker can be mounted onto an KH 870 to make a large 4-way column system



  Allows main loudspeakers to play louder and with lower distortion
  Wooden cabinet with a tough painted finish (anthracite or silver) and high density rubber isolating feet
  Excellent self-damping properties leading to minimal cabinet resonances
  Cabinet look conforms to the family design
−3 dB free field frequency response 18 - 300 Hz, ± 3 dB
Pass band free field frequency response 19 - 300 Hz, ± 2 dB
Self-generated noise level at 10 cm < 20 dB(A)
Total harmonic distortion < 0.5 % at 95 dB SPL at 1 m > 40 Hz
Max. SPL In half space at 3% THD 116.7 dB SPL

Max. SPL with pink noise in half space at 1 m

118 dB SPL
Averaged between 40 and 90 Hz
Amplifier, cont. (peak) output power (THD < 0,1 %) 320 W (400 W)
Controller design Analog, active
Main channel crossover frequency 80 Hz
Crossover slope 24 dB/oct
Equalization - Low cut 30 Hz, 0 … −12 dB
Parametric Equalizer Bypassable
Parametric Equalizer - Gain +4 … −12 dB
Parametric Equalizer - Frequency 20 … 120 Hz
Parametric Equalizer - Q 1 … 8
Time of Flight adjustment delay 0 … 4.69 ms @ 80 Hz (4-step 0, 45, 90, 135), - 180° Switch
Volume Control Hardware remote or RS-232
Calibration Tools Internal signal generator
Protection circuitry Peak and Thermo Limiters
Infrasonic filter frequency; slope 6.5 Hz; 12 dB/oct.
Remote control On a CAT-5
Analog Inputs and Outputs
Input/Output channels 7.1 / 7+Sum
Impedanz electrically balanced XLR, 13 kΩ
Input sensitivity −8 and +6 dBu
Max. input level

+19 dBu (6.9 Vrms) / per channel

CMRR > 60 dB @ 15 kHz
Interchannel isolation (1 kHz), level matching −95 dB, ±0.1  dB
Volume control range, resolution 118 dB, 0.25 dB
Dynamic range, THD+N 119 dB(A), <0. 001% (−100 dB)
LFE Modes 80+re-routing, 80, 120, wide
LFE Gain 0 / +10 dB
Gain Control +2 … −12 dB
Displays and indicators: power on Red LED
- limit/clip Red LED “Flashing”
- bass management active Green LED
Mains power 220 - 240 / 100 - 120 V AC (switchable)
Power consumption - Idle 25 W
Power consumption - Full output 550 W
Cabinet surface finish Painted
Color: standard

Anthracite (RAL 7021)

Baffle cover Included metal grille
Drivers Magnetically shielded
Woofer 2 x 265 mm (10")
Product dimensions 
(height x width x depth), mm (inches) 
735 x 330 x 645 mm, (28.9" x 13" x 25.4")
Packed dimensions 
(height x width x depth), mm (inches)
860 x 470 x 770 mm, (33 7/8" x 18 1/2" x 30 3/8")
Internal net volume 86 l
External volume 156 l
Weight 47,1 kg (103.6 lbs)
Delivery includes 1x KH 870 
3x Power cables (Euro, UK, USA) 
1x Operating manual 
1x Supplement "Getting Started Quickly"


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