Neumann KH 870 Active Studio Subwoofer

2 x 10 Inch Bass Driver with 7.1 HD Bass Manager

The Neumann KH 870 is the legendary Microphone manufacturer's flagship Subwoofer.  Designed to keep up with ever changing formats, the HD Bass Management system - compatible from Mono to 7.1, independent control of front and rear channels and system wide volume control found in the KH 870 means this subwoofer is perfect for high end studio situations now and in the future.

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The Neumann KH 870 subwoofer is built to accompany Neumann's vast array of monitors. Intended to be utilised in music, broadcast, and post production studios for tracking, mixing, and mastering, the Neumann KH 870 will leave you reeling from its power.

The sub has the capacity to be run solo or daisy-chained, making it possible to construct larger systems with the possibility of higher SPL. The cabinet can be set up adjacent or flush mounted to a wall thanks to the front mounted port. The KH 870 also has the ability to be mixed freely in multichannel systems with other loudspeakers from the range.

The KH 870 provides a modern 7.1 High Definition Bass Manager, compatible with all standard consumer formats from mono through to the latest 7.1 HD systems. Eight channels of analogue inputs also guarantee the necessary adaptability for modern studios to function. Four-mode LFE-channel processing ensures connectivity across all formats and industries. Fourth-order crossovers and flexible acoustical controls permit for endless system integration.

The latest amplifier tech and sonic components were utilised by Neumann in the KH870 to guarantee the most precise sound reproduction possible. Sturdy drivers, a robust cabinet and precision engineered ports ensure firm and expressive low frequency reproduction without colouration, even at high replay levels. Using the sum output, Plane Wave Bass Array (PWBA) techniques acoustically develops lateral consistency in the listening area. The bass extends down to 18 Hz.

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
More Information

Technical Data


−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")

Height x width x depth: 735 x 330 x 645 mm (28.9" x 13" x 25.4")

Internal net volume: 86 l

External volume: 156 l

Weight: 47,1 kg (103.6 lbs)

  • 1x KH 870 
  • 3x Power cables (Euro, UK, USA) 
  • 1x Operating manual 
  • 1x Supplement "Getting Started Quickly"