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Powerful Reference-Quality Sub for Immersive Systems
The KH 870 II is the perfect subwoofer for larger rooms, providing powerful bass extension with Neumann precision. It includes a unique and flexible Bass Manager for stereo, surround and immersive systems up to 7.1.4. Analog and digital outputs provide flexible connectivity to up to 11 studio monitors.
Next Generation Subwoofer
The KH 870 II improves on its predecessor in acoustic performance and adds new features. Thanks to two novel long-throw 10” woofers with Extremely Linear Force Factor (ELFF™) technology and intelligent protection limiters, the KH 870 II ensures exceptionally low distortion even at maximum SPLs.
The KH 870 II extends low frequency reproduction down to 16 Hz and delivers about twice the output of the KH 810 II. This makes the KH 870 II the perfect complement to midfield speakers such as the KH 420.
The KH 870 II is DSP-controlled for superior sonic performance and seamless integration via MA 1 Automatic Monitor Alignment (sold separately). When combined with analog Neumann studio monitors such as the KH 120 A (discontinued), KH 310, or KH 420, it offers sufficient DSP-power for aligning an entire stereo, surround or even immersive system up to 7.1.4 via MA 1, optimizing not only the frequency response but also the phase. Of course, the KH 870 II is also a perfect complement to Neumann’s DSP-equipped studio monitors. In surround and immersive systems, analog and DSP-equipped Neumann speakers can be combined and room-aligned using MA 1 with Multichannel Extension (sold separately). The KH 870 II is therefore much more than “just” a subwoofer: It is the perfect tool for upgrading existing systems and/or extending them for immersive audio.
Precision in Every Detail
As subwoofers are typically placed on the floor, robust grilles protect the drivers from accidental damage. The rigid cabinet features a highly efficient bass reflex system, which is carefully engineered and tuned for the tightest bass reproduction – with inaudible port noise.
Two analog XLR inputs and outputs are available to connect the subwoofer for stereo operation. For multichannel operation, the KH 870 II offers two Sub D25 connectors for up to 12 analog input channels and another two Sub D25 connectors for up to 11 analog output channels. All inputs and outputs are electronically balanced. Studio monitors can also be connected digitally via AES3 (BNC). For audio networking, this subwoofer is also available as an AES67 variant, the KH 870 II AES67.
The KH 870 II excels in music, film scoring, broadcast, and post-production studios for tracking, mixing, and mastering. Thanks to a novel power amp design, the KH 870 II combines superior audio performance with excellent energy efficiency. Its Auto Standby function can be deactivated in the MA 1 app.
| Product Name | Neumann KH 870 II Dual 10" Active Studio Subwoofer |
|---|---|
| Brand | Neumann |
| Condition | New |
| MPN | 700284 |
| UPC | 615104387607 |
| Shipping Option | Free Shipping on orders over $94.72 |
What's in the Box?
- Neumann KH 870 II Dual 10" Active Studio Subwoofer
- 4 x Mains Cable
(1) Ultra stiff wooden cabinet
- Tough painted finish and build-in rubber feet for acoustic isolation
- Excellent self-damping properties leading to minimal cabinet resonances
- No standing wave resonances inside cabinet
- Ultra tight bass reproduction due to very low group delay
(2) Two in-house modelled long-throw bass drivers with Extremely Linear Force
Factor™ (ELFF™) and robust resonance optimized basket
- Damping of break up modes brings low distortion at high sound levels
- Extremely linear force factor provides low harmonic distortion even at high excursions
- Reduced air noise and improved rocking modes
- Grille protects against mechanical damage
(3) XLR electronically balanced analog inputs and outputs (stereo)
- Standard interfacing to professional equipment
- Daisy chain input and output for subwoofer arrays
(4) Two electronically balanced SUB-D 25 connectors for up to 12 analog input channels and another two SUB-D 25 connectors for up to 11 analog output channels. The pinout follows the Tascam standard.
(5) Digital outputs (multichannel)
- 192 kHz, 24-bit conversion
- 7x BNC: Channels 1-3, Channels 5-12, Daisy Chain Out
(6) Network connector using standard IP protocol and your existing network infrastructure
- Loudspeaker system including analog KH-line monitors can be controlled via MA 1 - Automatic Monitor Alignment Software.
(7) Control function
- Toggle switch for selection of two completely independent modes of operation and calibration: on the device or via the network using the MA 1 - Automatic Monitor Alignment software.
(8) Universal switched-mode power supply (100 … 240 V)
- One version works in any country and is robust to poor quality mains supply.
(9) Ground lift to overcome ground loops
- Inputs with very high CMRR to reduce noise induced by long cables in electrically noisy environments
- Completely symmetrical internal signal flow to avoid electrical interferences
(10) Low heat dissipation amplifiers with large headroom and sophisticated protection circuitry
- Improved transient response
- Assured reliability and safety
- Separate thermo 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
(11) Standby function
- Reduces power consumption when product is not in use.
Acoustics |
|
|---|---|
| Free field frequency response ±6 dB | 16 – 750 Hz |
| Free field frequency response ±3 dB | 18 – 310 Hz |
| Self-generated noise (10 cm) | <20 dB(A) SPL |
| Sine wave output (THD <0.5% @ 1 m half space) | 95 dB SPL (33 – 200 Hz) |
| Bass capability (Max SPL, 3% THD, 1 m) | 114.9 dB (50–100 Hz average) |
| Max SPL (Subwoofer placement) | On floor: 114.9 dB; Against wall: 117.9 dB; In corner: 120.9 dB |
| Dolby DARDT Max SPL (bass managed) | 123 dB SPL |
| Acoustical principle | Bass reflex, front ports |
Analog Inputs and Outputs |
|
| Analog inputs | 2 × XLR (balanced) 1 × SUB-D 25: 8 × balanced 1 × SUB-D 25: 4 × balanced |
| Input impedance | >12 kΩ |
| Max input level | 24 dBu (CH 1–3,12); 21 dBu (CH 5–11) |
| CMRR (XLR / Sub-D) | >56 dB @ 15 kHz |
| Crosstalk (1 kHz) | -90 dB; ±0.1 dB |
| Remote volume control | Via MA 1 software |
| Volume control range / resolution | 0 … -∞ dB; 0.1 dB steps |
| Analog dynamic range / THD+N | 120 dB(A) (CH 1–3,12); 116 dB(A) (CH 5–11) <0.003% (-90 dB) |
| Signal routing modes | Analog |
| Analog outputs | 2 × XLR (balanced) 1 × SUB-D 25: 7 × balanced 1 × SUB-D 25: 4 × balanced |
Digital Inputs and Outputs |
|
| Digital inputs | 1 × BNC (daisychain in) |
| Digital outputs | 7 × BNC: 11 × Monitor out; 1 × Daisy chain out |
| Converter resolution | 24-bit |
| Supported sampling rates | 32 – 200 kHz |
| Internal / Output sampling rate | 48 kHz / 48 kHz |
| Dynamic range | A-D: CH 1–3,12 = 124 dB(A); CH 5–11 = 121 dB(A) A-D-A: CH 1–3,12 = 121.5 dB(A); CH 5–11 = 116.2 dB(A) D-A: CH 1–3,12 = 125 dB(A); CH 5–11 = 118 dB(A) |
| Digital sensitivity | -18 dBFS = 100 dB SPL @ 1 m |
| Latency | 2 ms (A-D-A) |
| User adjustable delay | 0 – 115 ms Resolution: 20.8 µs; 0.71 mm (0.028") Max AV sync: 2 frames (40 ms); 2.75 frames (33 ms) |
User Interface |
|
| Status indication | Illuminated Neumann logo |
| Ground lift | Yes |
| Control | Local; Network |
| Mains switch | Yes |
| Logo brightness | Adjustable via MA 1 software |
Electronics – Controller |
|
| Controller design | Digital; active |
| DSP resolution | 32-bit audio, 64-bit double precision processing |
| Crossover frequency / slope | 80 Hz / 24 dB per octave, 4th order |
| Room calibration (MA 1) | Yes; Subwoofer and connected analog loudspeakers |
| FIR phase linearization | For connected loudspeakers (via MA 1) |
| Protection circuitry | Soft clip, peak and thermal limiters; woofer excursion limiter; PSU/electronics/amplifier protection |
| Remote control | Via Ethernet and MA 1 |
| Display (status) | White = normal Rosé = identification Red = limit/clip/errors/protection/mute |
Electronics – Amplifiers and Power Supply |
|
| Output power (woofer amp) | 360 W (THD+N ≤0.1%, limiter active) |
| Power supply | SMPS, 100–240 V, 50/60 Hz |
| Power consumption | Standby: ≤300 mW Idle: 41 W Full output (100 V): 510 W Full output (230 V): 510 W Full output (240 V): 472 W |
| Standby | Automatic after 20 minutes (default), user definable |
Mechanics |
|
| Cabinet material | Wood with aluminum electronics panel |
| Finish / color | Painted; Metallic Anthracite (RAL 7021) / Black (RAL 9005) |
| Operating conditions | +10° C to +40° C (+50° F to +104° F); <75% RH, non-condensing |
| Storage conditions | -25° C to +60° C (-13° F to +140° F); <90% RH, non-condensing |
| Woofer | 2 × 265 mm (10") with black metal grille |
| Mounting points | 35 mm flange on top panel |
| Product dimensions (H × W × D) | 737 × 330 × 645 mm (28.9" × 13" × 25.4") |
| External net volume | 157 liters |
| Product weight | 44.5 kg (98 lbs 2 oz) |
| Packed dimensions (H × W × D) | 839 × 454 × 749 mm (33" × 17.9" × 29.5") |
| Packed weight | 51.2 kg |
| Packaging weight (incl. cables/manuals) | 6.7 kg |
| Packed volume | 0.285 m³ |
| Delivery includes | KH 870 II Subwoofer Mains cables (EU/KC, UK, US, China) Getting Started Guide Operating Manual |
| Acoustical axis (horizontal / vertical) | 165 mm / 365 mm (from bottom) |
Neumann KH 870 II Dual 10" Active Studio Subwoofer
Powerful Reference-Quality Sub for Immersive Systems
The KH 870 II is the perfect subwoofer for larger rooms, providing powerful bass extension with Neumann precision. It includes a unique and flexible Bass Manager for stereo, surround and immersive systems up to 7.1.4. Analog and digital outputs provide flexible connectivity to up to 11 studio monitors.
Next Generation Subwoofer
The KH 870 II improves on its predecessor in acoustic performance and adds new features. Thanks to two novel long-throw 10” woofers with Extremely Linear Force Factor (ELFF™) technology and intelligent protection limiters, the KH 870 II ensures exceptionally low distortion even at maximum SPLs.
The KH 870 II extends low frequency reproduction down to 16 Hz and delivers about twice the output of the KH 810 II. This makes the KH 870 II the perfect complement to midfield speakers such as the KH 420.
The KH 870 II is DSP-controlled for superior sonic performance and seamless integration via MA 1 Automatic Monitor Alignment (sold separately). When combined with analog Neumann studio monitors such as the KH 120 A (discontinued), KH 310, or KH 420, it offers sufficient DSP-power for aligning an entire stereo, surround or even immersive system up to 7.1.4 via MA 1, optimizing not only the frequency response but also the phase. Of course, the KH 870 II is also a perfect complement to Neumann’s DSP-equipped studio monitors. In surround and immersive systems, analog and DSP-equipped Neumann speakers can be combined and room-aligned using MA 1 with Multichannel Extension (sold separately). The KH 870 II is therefore much more than “just” a subwoofer: It is the perfect tool for upgrading existing systems and/or extending them for immersive audio.
Precision in Every Detail
As subwoofers are typically placed on the floor, robust grilles protect the drivers from accidental damage. The rigid cabinet features a highly efficient bass reflex system, which is carefully engineered and tuned for the tightest bass reproduction – with inaudible port noise.
Two analog XLR inputs and outputs are available to connect the subwoofer for stereo operation. For multichannel operation, the KH 870 II offers two Sub D25 connectors for up to 12 analog input channels and another two Sub D25 connectors for up to 11 analog output channels. All inputs and outputs are electronically balanced. Studio monitors can also be connected digitally via AES3 (BNC). For audio networking, this subwoofer is also available as an AES67 variant, the KH 870 II AES67.
The KH 870 II excels in music, film scoring, broadcast, and post-production studios for tracking, mixing, and mastering. Thanks to a novel power amp design, the KH 870 II combines superior audio performance with excellent energy efficiency. Its Auto Standby function can be deactivated in the MA 1 app.
| Product Name | Neumann KH 870 II Dual 10" Active Studio Subwoofer |
|---|---|
| Brand | Neumann |
| Condition | New |
| MPN | 700284 |
| UPC | 615104387607 |
| Shipping Option | Free Shipping on orders over $94.72 |
What's in the Box?
- Neumann KH 870 II Dual 10" Active Studio Subwoofer
- 4 x Mains Cable
(1) Ultra stiff wooden cabinet
- Tough painted finish and build-in rubber feet for acoustic isolation
- Excellent self-damping properties leading to minimal cabinet resonances
- No standing wave resonances inside cabinet
- Ultra tight bass reproduction due to very low group delay
(2) Two in-house modelled long-throw bass drivers with Extremely Linear Force
Factor™ (ELFF™) and robust resonance optimized basket
- Damping of break up modes brings low distortion at high sound levels
- Extremely linear force factor provides low harmonic distortion even at high excursions
- Reduced air noise and improved rocking modes
- Grille protects against mechanical damage
(3) XLR electronically balanced analog inputs and outputs (stereo)
- Standard interfacing to professional equipment
- Daisy chain input and output for subwoofer arrays
(4) Two electronically balanced SUB-D 25 connectors for up to 12 analog input channels and another two SUB-D 25 connectors for up to 11 analog output channels. The pinout follows the Tascam standard.
(5) Digital outputs (multichannel)
- 192 kHz, 24-bit conversion
- 7x BNC: Channels 1-3, Channels 5-12, Daisy Chain Out
(6) Network connector using standard IP protocol and your existing network infrastructure
- Loudspeaker system including analog KH-line monitors can be controlled via MA 1 - Automatic Monitor Alignment Software.
(7) Control function
- Toggle switch for selection of two completely independent modes of operation and calibration: on the device or via the network using the MA 1 - Automatic Monitor Alignment software.
(8) Universal switched-mode power supply (100 … 240 V)
- One version works in any country and is robust to poor quality mains supply.
(9) Ground lift to overcome ground loops
- Inputs with very high CMRR to reduce noise induced by long cables in electrically noisy environments
- Completely symmetrical internal signal flow to avoid electrical interferences
(10) Low heat dissipation amplifiers with large headroom and sophisticated protection circuitry
- Improved transient response
- Assured reliability and safety
- Separate thermo 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
(11) Standby function
- Reduces power consumption when product is not in use.
Acoustics |
|
|---|---|
| Free field frequency response ±6 dB | 16 – 750 Hz |
| Free field frequency response ±3 dB | 18 – 310 Hz |
| Self-generated noise (10 cm) | <20 dB(A) SPL |
| Sine wave output (THD <0.5% @ 1 m half space) | 95 dB SPL (33 – 200 Hz) |
| Bass capability (Max SPL, 3% THD, 1 m) | 114.9 dB (50–100 Hz average) |
| Max SPL (Subwoofer placement) | On floor: 114.9 dB; Against wall: 117.9 dB; In corner: 120.9 dB |
| Dolby DARDT Max SPL (bass managed) | 123 dB SPL |
| Acoustical principle | Bass reflex, front ports |
Analog Inputs and Outputs |
|
| Analog inputs | 2 × XLR (balanced) 1 × SUB-D 25: 8 × balanced 1 × SUB-D 25: 4 × balanced |
| Input impedance | >12 kΩ |
| Max input level | 24 dBu (CH 1–3,12); 21 dBu (CH 5–11) |
| CMRR (XLR / Sub-D) | >56 dB @ 15 kHz |
| Crosstalk (1 kHz) | -90 dB; ±0.1 dB |
| Remote volume control | Via MA 1 software |
| Volume control range / resolution | 0 … -∞ dB; 0.1 dB steps |
| Analog dynamic range / THD+N | 120 dB(A) (CH 1–3,12); 116 dB(A) (CH 5–11) <0.003% (-90 dB) |
| Signal routing modes | Analog |
| Analog outputs | 2 × XLR (balanced) 1 × SUB-D 25: 7 × balanced 1 × SUB-D 25: 4 × balanced |
Digital Inputs and Outputs |
|
| Digital inputs | 1 × BNC (daisychain in) |
| Digital outputs | 7 × BNC: 11 × Monitor out; 1 × Daisy chain out |
| Converter resolution | 24-bit |
| Supported sampling rates | 32 – 200 kHz |
| Internal / Output sampling rate | 48 kHz / 48 kHz |
| Dynamic range | A-D: CH 1–3,12 = 124 dB(A); CH 5–11 = 121 dB(A) A-D-A: CH 1–3,12 = 121.5 dB(A); CH 5–11 = 116.2 dB(A) D-A: CH 1–3,12 = 125 dB(A); CH 5–11 = 118 dB(A) |
| Digital sensitivity | -18 dBFS = 100 dB SPL @ 1 m |
| Latency | 2 ms (A-D-A) |
| User adjustable delay | 0 – 115 ms Resolution: 20.8 µs; 0.71 mm (0.028") Max AV sync: 2 frames (40 ms); 2.75 frames (33 ms) |
User Interface |
|
| Status indication | Illuminated Neumann logo |
| Ground lift | Yes |
| Control | Local; Network |
| Mains switch | Yes |
| Logo brightness | Adjustable via MA 1 software |
Electronics – Controller |
|
| Controller design | Digital; active |
| DSP resolution | 32-bit audio, 64-bit double precision processing |
| Crossover frequency / slope | 80 Hz / 24 dB per octave, 4th order |
| Room calibration (MA 1) | Yes; Subwoofer and connected analog loudspeakers |
| FIR phase linearization | For connected loudspeakers (via MA 1) |
| Protection circuitry | Soft clip, peak and thermal limiters; woofer excursion limiter; PSU/electronics/amplifier protection |
| Remote control | Via Ethernet and MA 1 |
| Display (status) | White = normal Rosé = identification Red = limit/clip/errors/protection/mute |
Electronics – Amplifiers and Power Supply |
|
| Output power (woofer amp) | 360 W (THD+N ≤0.1%, limiter active) |
| Power supply | SMPS, 100–240 V, 50/60 Hz |
| Power consumption | Standby: ≤300 mW Idle: 41 W Full output (100 V): 510 W Full output (230 V): 510 W Full output (240 V): 472 W |
| Standby | Automatic after 20 minutes (default), user definable |
Mechanics |
|
| Cabinet material | Wood with aluminum electronics panel |
| Finish / color | Painted; Metallic Anthracite (RAL 7021) / Black (RAL 9005) |
| Operating conditions | +10° C to +40° C (+50° F to +104° F); <75% RH, non-condensing |
| Storage conditions | -25° C to +60° C (-13° F to +140° F); <90% RH, non-condensing |
| Woofer | 2 × 265 mm (10") with black metal grille |
| Mounting points | 35 mm flange on top panel |
| Product dimensions (H × W × D) | 737 × 330 × 645 mm (28.9" × 13" × 25.4") |
| External net volume | 157 liters |
| Product weight | 44.5 kg (98 lbs 2 oz) |
| Packed dimensions (H × W × D) | 839 × 454 × 749 mm (33" × 17.9" × 29.5") |
| Packed weight | 51.2 kg |
| Packaging weight (incl. cables/manuals) | 6.7 kg |
| Packed volume | 0.285 m³ |
| Delivery includes | KH 870 II Subwoofer Mains cables (EU/KC, UK, US, China) Getting Started Guide Operating Manual |
| Acoustical axis (horizontal / vertical) | 165 mm / 365 mm (from bottom) |
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