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  • 503947

    Neumann KH 870 G Active Subwoofer with 7.1 Bass Management

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    The KH 870 is an answer to the demands by offering a 7.1 High Definition Bass Manager™. The flexibility of this bypassable 7.1 bass manager means it is also compatible with all standard consumer formats from mono through to the latest 7.1 HD systems.

    Eight channels of analog ensure 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 allow for centralized system control independent of the source, and the electronics can be remotely located to reduce cabling. From Mono to 3D, there are uses for the KH 870 in many different system configurations.


    • Bass extension for loudspeakers down to 18 Hz
    • Increasing the maximum SPL of loudspeakers by up to 8 dB
    • Decreasing harmonic and intermodulation distortion of loudspeakers
    • Reproducing the LFE channel
    • Reproducing the “Sub” signal of a bass managed multichannel source
    • Making a Plane Wave Bass Array™ system
    • Working as an extension for KH line subwoofer systems

    Computer mechanically modeled cabinet design using Low resonance Integral Molding™ (LRIM™) materials

    • Wooden cabinet with a tough painted finish and high-density rubber isolating feet
    • Excellent self-damping properties lead to minimal cabinet resonances
    • No standing wave resonances inside the cabinet
    • Reduced cabinet resonances

    In-house modeled long-throw composite sandwich cone bass driver with Extremely Linear Force Factor™ (ELFF™), magnetic shielding, flow-optimized die-cast basket, and robust built-in grille

    • Damping of break up modes brings low distortion at high sound levels
    • Linear piston motor gives a very low harmonic distortion even at high excursions
    • Reduced air noise and improved rocking modes
    • Grille protects against mechanical damage

    Large high-capacity flow-optimized bass reflex ports

    • Fast bass transient response
    • Reduced bass compression at high output levels
    • Can be flush mounted

    XLR electronically balanced analogue inputs and outputs

    • Standard interfacing to professional equipment
    • Daisy chain output for subwoofer arrays

    7.1 High Definition Bass Management

    • Compatible with all systems from mono to 3D
    • Bypassable 4th order 80 Hz active crossover for maximum compatibility with consumer reproduction systems
    • Allows main loudspeakers to play louder and with lower distortion

    Remote control

    • NRC 1 and SEA 1 hardware remote control
    • RS-232 control possible

    LFE gain

    • 0 and +10 dB

    Four routing modes

    • LFE to the subwoofer and left/right
    • LFE to subwoofer only up to 80 Hz
    • LFE to subwoofer only up to 120 Hz
    • LFE to the subwoofer with no filtering – for daisy-chaining subwoofers and external signal processing systems

    Wide range input gain and output level controls

    • Easier interfacing with signal sources

    8-position phase control (with built-in test tone), continuous low cut control, and parametric equalizer

    • More control in diverse acoustical environments
    • A parametric equalizer is bypassable if not needed

    Bass Management controls

    • Bypassable
    • Independent control of bass management bypass for front and back channels
    • System volume control on/off

    Universal switched-mode power supply (100 … 240 V)

    • One version works in any country and is robust to the poor quality mains supply
    • Electronics can be remotely powered on with two modes of operation (0 V and 12 V triggers)

    Ground lift

    • Reduced noise in electrically noisy environments and over-comes ground loops

    Sum output

    • Larger systems and Plane Wave Bass Arrays™ may be constructed using the Sum output

    Low heat dissipation amplifiers with large headroom and overheat limiting

    • Improved transient response
    • Assured reliability and safety

    Separate fast-acting thermal limiter to protect the voice coil and power amplifier

    • Soft clip and excursion limiters
    • Increases system reliability
    • Allows extraction of the maximum performance from the system

    Installation flexibility

    • Remote electronics (REK 3) for ease of installation, less cabling, and convenience of use


    Free field frequency response ±6 dB

    17 … 600 Hz

    Free field frequency response ±3 dB

    18 … 300 Hz

    Reproduction accuracy between 50 Hz and 100 Hz: 100%, 80%, 50% of subwoofers produced

    ±1.20; ±0.54; ±0.28 dB

    Self-generated noise at 10 cm (with input gain set to 100 dB SPL for 0 dBu)

    <20 dB(A) SPL

    Sine wave output with a THD < 0.5 % at 1 m in half space

    95 dB SPL (>40 Hz)

    Bass capability: Max. SPL in half space at 3% THD at 1m (averaged between 50 Hz and 100 Hz)

    116.7 dB SPL

    Max. long term SPL with pink noise at 2.3 m, in typical listening conditions (single / pair full range)

    118 dB SPL

    Analog input(s)

    8 x XLR: analog electronically balanced

    Analog input impedance

    >13k Ohms

    Max. input level

    +19 dBu

    Common mode rejection ratio (CMRR)

    > 56 dB @ 15 kHz

    Crosstalk (1 kHz), level matching

    -95 dB; ±0.1  dB

    Volume control

    NRC 1 hardware remote or RS-232

    Volume control range; resolution

    118 dB; 0.25 dB

    Analog dynamic range; THD+N

    119 dB(A); <0.001% (-100 dB)

    Signal routing modes

    LFE 80+re-routing; LFE 80 Hz; LFE 120 Hz; Wide

    LFE Gain

    0 / +10 dB

    Analog output(s)

    8 x XLR; analog electronically balanced

    Input gain control (sensitivity)

    +2 ... -12 dB

    Output level control (output level in 1 m based on 0 dBu input level)

    100; 114 dB SPL

    Controller design

    Analog, active

    Crossover frequency

    80 Hz

    Crossover slope

    24 dB/oct; 4th order

    Equalization: Low cut

    30 Hz; 0 … -12 dB

    Equalization: Parametric EQ: Gain

    +4 ... -12 dB

    Equalization: Parametric EQ: Frequency

    Bypass; 20 ... 120 Hz

    Equalization: Parametric EQ: Q

    1 ... 8


    0; 45; 90; 135 and 0/180 deg

    Protection circuitry

    Peak and thermo limiters

    Infrasonic filter: frequency; slope

    6.5 Hz; 12 dB/oct.

    Remote control

    RJ45 connector: Via NRC1 remote control (optional): volume for all channels; bass management on/off; LFE gain 0/10 dB.Via RS-232: more parameters remote controllable

    Display: On; Normal Operation

    Red LED

    Display: Limit / Clip / Errors / Protection /Boot Mute / Shut Down Mute

    Red LED

    Display: Bass Management on

    Green LED

    Output power woofer amplifier (THD+N with limiter deactivated: 10%)

    400 W

    Output power woofer amplifier (THD+N with limiter deactivated: 0.1%)

    320 W

    Mains Power Supply: input voltage; frequency

    220-240 / 100-120 V (switchable); 50/60 Hz

    Power consumption (230 V / 100 V): Idle

    25 W

    Power consumption (230 V / 100 V): Full output

    550 W

    Cabinet material

    Wood cabinet, aluminum electronics panel

    Cabinet surface finish; color (front / back)

    Painted; metallic anthracite (RAL 7021) / black (RAL 9005)

    Operating conditions

    +10° C to +40° C (+50° F to +104° F); <90% RH, non-condensing

    Transport/storage conditions

    -25° C to +70° C (-13° F to 158° F); <90% RH; non-condensing


    2 x 265 mm (10") with magnetic shielding and protecting black metal grille

    Mounting points

    35 mm flange on top panel

    Product dimensions (height x width x depth)

    735 x 330 x 645 mm (28.9" x 13" x 25.4")

    External net volume

    156 liters

    Product weight

    47.1 kg (103 lbs 13 oz)

    Cabinet weight when electronics remote located

    45.5 kg (100 lbs 5 oz)

    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")

    Packed weight

    54.3 kg (119 lbs 11 oz)

    Packed cube

    0.311 m³