Neumann KH 870 II – Dual 10-Inch DSP Studio Subwoofer
Neumann KH 870 II – Dual 10-Inch DSP Studio Subwoofer is backordered and will ship as soon as it is back in stock.
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Neumann KH 870 II – Dual 10-Inch DSP Studio Subwoofer
Product Overview
The Neumann KH 870 II is a DSP-controlled active studio subwoofer built for large mixing rooms, film scoring stages, and post-production suites that require deep, high-output bass extension with full multichannel integration. Two in-house modelled 10-inch ELFF (Extremely Linear Force Factor) long-throw drivers deliver frequency reproduction down to 16 Hz with bass capability rated at 114.9 dB SPL at 1 m in half-space. The KH 870 II functions as both a high-output subwoofer and the DSP backbone for complete multichannel systems up to 7.1.4 — providing analog and AES3 outputs to drive up to 11 satellite monitors while handling bass management and MA 1 room correction for the entire array. It is the analog/AES3 version of the KH 870 II platform; facilities requiring network audio should consider the KH 870 II AES67.
Product Description
The KH 870 II delivers approximately twice the output of the KH 810 II, making it the appropriate choice for large-format midfield systems anchored by speakers such as the Neumann KH 420. Two analog XLR inputs and outputs handle stereo operation, while dual Sub-D25 connectors (Tascam pinout) extend the I/O to up to 12 analog input channels and 11 analog output channels for multichannel configurations. Seven BNC connectors provide AES3 digital output to up to 11 studio monitors. A single BNC daisy-chain input allows multiple subwoofers to be linked in array deployments.
Internal DSP operates at 32-bit audio with 64-bit double-precision processing, running the crossover at 80 Hz / 24 dB per octave (4th order). The analog dynamic range is rated at 120 dB(A) on channels 1–3 and 12. A user-adjustable delay of 0–115 ms (20.8 µs resolution) provides precise time-alignment. At maximum SPL the unit draws 510 W from a universal switched-mode power supply (100–240 V); idle draw is 41 W. An auto-standby function (20-minute default) can be adjusted or disabled via MA 1 software.
MA 1 Automatic Monitor Alignment (sold separately) uses the subwoofer’s onboard DSP to correct frequency response and phase — including FIR phase linearization — for the KH 870 II itself and all connected analog KH-line monitors. This gives the system DSP processing power sufficient for aligning an entire 7.1.4 immersive configuration without a separate DSP unit. The MA 1 Multichannel Extension (sold separately) is required for surround and immersive configurations beyond stereo.
| Specification | Value |
|---|---|
| Frequency Response (±6 dB) | 16 – 750 Hz |
| Frequency Response (±3 dB) | 18 – 310 Hz |
| Max SPL (half-space, 1 m, 3% THD) | 114.9 dB |
| Dolby DARDT Max SPL (bass managed) | 123 dB SPL |
| Woofers | 2 x 265 mm (10") with metal grille |
| Amplifier Output Power | 360 W |
| Crossover Frequency / Slope | 80 Hz / 24 dB/oct (4th order) |
| Analog Inputs | 2 x XLR + 2 x Sub-D25 (up to 12 channels) |
| Analog Outputs | 2 x XLR + 2 x Sub-D25 (up to 11 channels) |
| Digital Outputs | 7 x BNC AES3 (11 monitor channels + daisy-chain) |
| Dimensions (H x W x D) | 737 x 330 x 645 mm (28.9" x 13" x 25.4") |
| Weight | 44.5 kg (98 lbs 2 oz) |
| Power Supply | Universal SMPS, 100–240 V / 50–60 Hz |
Key Features
- ELFF Dual 10-Inch Woofers — Two in-house modelled 265 mm long-throw drivers with Extremely Linear Force Factor technology provide low harmonic distortion across the full excursion range, maintaining accurate bass at high SPLs.
- 16 Hz Low-Frequency Extension — Free-field response extends to 16 Hz (±6 dB), providing usable output well below the LFE band for film post-production, mastering, and immersive audio work.
- Multichannel Bass Management (up to 7.1.4) — Onboard DSP handles bass management for stereo, surround, and immersive configurations, routing LFE and low-frequency content from up to 12 input channels while distributing high-pass filtered signals to up to 11 satellite monitors.
- MA 1 Room Correction Ready — Compatible with Neumann MA 1 Automatic Monitor Alignment (sold separately) for full-system FIR phase linearization and room correction, including connected analog KH-line monitors. Sufficient DSP headroom for a complete multichannel system up to 7.1.4.
- Comprehensive Analog and AES3 I/O — XLR stereo I/O, dual Sub-D25 connectors (up to 12 inputs / 11 outputs), and 7 x BNC AES3 digital outputs cover all conventional professional signal chains without requiring network audio infrastructure.
- 114.9 dB Max SPL (up to 120.9 dB Corner-Loaded) — Output levels suitable for large-format mixing and mastering rooms; Dolby DARDT bass-managed SPL is rated at 123 dB.
- 64-Bit Double-Precision DSP — Internal processing uses 64-bit double-precision arithmetic for maximum headroom and minimum rounding error across complex multichannel routing and EQ operations.
- Up to 115 ms Adjustable Delay — Fine-grained time-alignment (20.8 µs resolution) compensates for physical placement offsets in large rooms and multi-sub arrays.
- Daisy-Chain Sub Array Support — BNC daisy-chain input allows multiple KH 870 II units to be linked for distributed subwoofer array configurations.
- Universal Power Supply with Auto Standby — Switched-mode power supply accepts 100–240 V globally; standby draw is under 300 mW; idle draw is 41 W.
Typical Applications
- Broadcast studio
- Multi-purpose room
- Auditorium
Technical Specifications
| Specification | Value |
|---|---|
| Free Field Frequency Response (±6 dB) | 16 – 750 Hz |
| Free Field Frequency Response (±3 dB) | 18 – 310 Hz |
| Self-Generated Noise (at 10 cm) | <20 dB(A) SPL |
| Sine Wave Output THD <0.5% at 1 m (33–200 Hz) | 95 dB SPL |
| Max SPL — Half-Space (3% THD, 50–100 Hz avg) | 114.9 dB |
| Max SPL — Floor / Wall / Corner | 114.9 / 117.9 / 120.9 dB |
| Dolby DARDT Max SPL (bass managed) | 123 dB SPL |
| Acoustical Principle | Bass reflex, front-firing ports |
| Woofers | 2 x 265 mm (10") ELFF, metal grille |
| Amplifier Output Power (0.1% THD+N) | 360 W |
| Crossover Frequency / Slope | 80 Hz / 24 dB/oct (4th order) |
| DSP Resolution | 32-bit audio; 64-bit double-precision |
| Digital Internal / Output Sample Rate | 48 kHz |
| Digital Converter Resolution | 24-bit |
| Analog Inputs | 2 x XLR (balanced); 1 x Sub-D25 (8 ch); 1 x Sub-D25 (4 ch) |
| Analog Input Impedance | >12 kΩ |
| Max Analog Input Level | 24 dBu (CH 1–3, 12); 21 dBu (CH 5–11) |
| Analog Dynamic Range (A-weighted) | 120 dB(A) CH 1–3, 12; 116 dB(A) CH 5–11 |
| CMRR (XLR / Sub-D) | >56 dB @ 15 kHz |
| Analog Outputs | 2 x XLR (balanced); 1 x Sub-D25 (7 ch); 1 x Sub-D25 (4 ch) |
| Digital Input | 1 x BNC (daisy-chain in) |
| Digital Outputs | 7 x BNC AES3 (11 monitor channels + daisy-chain out) |
| Digital Converter Sample Rate Range | 32 kHz – 200 kHz |
| Dynamic Range A-D (CH 1,2,3,12 / CH 5–11) | 124 dBA / 121 dBA |
| Dynamic Range D-A (CH 1–3,12 / CH 5–11) | 125 dBA / 118 dBA |
| Digital Sensitivity | -18 dBFS = 100 dB SPL at 1 m |
| Latency (A-D-A) | 2 ms |
| User Delay Range / Resolution | 0–115 ms / 20.8 µs |
| Remote Control | Via Ethernet and MA 1 software |
| MA 1 Room Correction | Yes — subwoofer + connected analog loudspeakers |
| Power Supply | Universal SMPS 100–240 V / 50–60 Hz |
| Idle Power Consumption | 41 W |
| Full-Output Power Consumption | 510 W (100 V); 472 W (240 V) |
| Standby Power Consumption | <300 mW |
| Auto Standby | 20 min default (configurable via MA 1) |
| Cabinet Material | Wood cabinet, aluminum electronics panel |
| Color | Metallic anthracite RAL 7021 (front) / Black RAL 9005 (rear) |
| Dimensions (H x W x D) | 737 x 330 x 645 mm (28.9" x 13" x 25.4") |
| Net Weight | 44.5 kg (98 lbs 2 oz) |
| Operating Temperature | +10°C to +40°C; <75% RH non-condensing |
| Mounting Points | 35 mm flange on top panel |
| Catalog Number | 700284 |
Frequently Asked Questions
Q: Which Neumann KH-line monitors pair well with the KH 870 II?
The KH 870 II is primarily paired with Neumann’s mid-size and large KH-line monitors. The KH 420 is the principal midfield complement — the sub delivers roughly twice the output of the KH 810 II, which is the natural sub for the KH 150 series. The KH 870 II also integrates with the KH 310 A and, via MA 1, with older analog monitors such as the KH 120 A. Up to 11 satellite monitors can be connected via the sub’s analog and AES3 outputs.
Q: Does the KH 870 II support network audio such as AES67 or Dante?
No. The standard KH 870 II uses analog XLR, Sub-D25, and AES3 (BNC) connections only. It does use an Ethernet port for control via MA 1 software, but this carries no audio signal. Facilities that need AES67 network audio input should select the KH 870 II AES67, which adds two redundant Ethernet ports for up to 12 channels of AES67 audio and is compatible with Dante-generated AES67 streams.
Q: What is the multichannel bass management capability of the KH 870 II?
The KH 870 II accepts up to 12 analog input channels via its XLR and Sub-D25 inputs, performs internal DSP bass management, and distributes high-pass filtered signals to up to 11 satellite monitors via analog and AES3 outputs. It supports stereo, surround, and immersive configurations up to 7.1.4. The MA 1 Multichannel Extension (sold separately) is required for full alignment of surround and immersive systems.
Q: What is MA 1 Automatic Monitor Alignment, and is it included?
MA 1 is Neumann’s room correction and monitor alignment software, sold separately. The KH 870 II carries sufficient DSP to run MA 1 correction for itself and all connected analog KH-line monitors, including FIR phase linearization. This eliminates the need for a separate room EQ processor in most studio configurations. The MA 1 Multichannel Extension (sold separately) extends support to surround and immersive systems.
Q: How does placement affect the KH 870 II’s output?
Like all subwoofers, the KH 870 II benefits from room boundary reinforcement. Neumann rates maximum SPL at 114.9 dB in half-space, 117.9 dB against a wall, and 120.9 dB in a corner (all at 1 m). For stereo and surround monitoring, central placement between the main speakers is standard. The onboard adjustable delay (0–115 ms, 20.8 µs resolution) and MA 1 alignment software compensate for any time-alignment offsets introduced by physical placement.
Q: Can I use multiple KH 870 II units in a subwoofer array?
Yes. The KH 870 II includes a BNC daisy-chain input that allows multiple units to be connected in sequence for distributed subwoofer arrays. Each unit requires its own power and analog input connection; signal distribution is handled through the daisy-chain BNC path. Consult the KH 870 II operating manual or contact Creation Networks for specific array wiring diagrams.
Q: What warranty and support is provided?
Neumann products purchased through authorized dealers are covered by Neumann’s standard manufacturer warranty. Contact Creation Networks for warranty terms applicable to your region, pre-sale system design assistance, or post-purchase technical support. Neumann’s official support portal is available at help.neumann.com.
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