Neumann KH 870 II AES67 – Dual 10-Inch Networked Studio Subwoofer
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Neumann KH 870 II AES67 – Dual 10-Inch Networked Studio Subwoofer
Product Overview
The Neumann KH 870 II AES67 is a flagship DSP-controlled active studio subwoofer designed for large-format mixing rooms, broadcast studios, and immersive post-production environments. Built around two in-house modelled 10-inch long-throw bass drivers with ELFF (Extremely Linear Force Factor) technology, it extends low-frequency reproduction down to 16 Hz with exceptionally low distortion at high SPLs. Redundant AES67 network audio connectivity — fully compliant with SMPTE ST 2110, ST 2022-7, and RAVENNA — makes this the correct choice for facilities integrating Neumann KH-line monitors into an Audio over IP infrastructure. With built-in multichannel bass management supporting configurations up to 7.1.4 and MA 1 Automatic Monitor Alignment compatibility, the KH 870 II AES67 functions as both a high-output subwoofer and the signal distribution hub for an entire networked monitoring system.
Product Description
The KH 870 II AES67 accepts up to 12 channels of AES67 network audio and distributes signal to up to 11 connected studio monitors via analog XLR, Sub-D25, and AES3 (BNC) outputs — consolidating multichannel routing through a single device. Two dedicated Ethernet ports (100Base-TX RJ-45) provide physical network redundancy per the ST 2022-7 standard, which is a requirement in professional broadcast and post-production installations where signal continuity cannot be interrupted. The subwoofer is DANTE-compatible via AES67 network streams, giving it a direct path into existing Dante-enabled infrastructure without a dedicated interface card.
DSP processing runs at 32-bit audio with 64-bit double-precision internal processing. The crossover operates at 80 Hz with a 4th-order 24 dB/oct slope. A user-adjustable delay of up to 115 ms (resolution: 20.8 µs) enables precise time-alignment of the sub relative to satellite monitors. Maximum SPL reaches 114.9 dB at 1 m in half-space, rising to 120.9 dB when corner-loaded — output levels appropriate for large-room mastering and film scoring stages. The Dolby DARDT bass-managed maximum SPL is rated at 123 dB SPL.
MA 1 Automatic Monitor Alignment (sold separately) provides full system room correction including FIR phase linearization for connected analog KH-line monitors. This means the KH 870 II AES67 carries enough DSP headroom to align an entire multichannel system — including legacy analog speakers such as the KH 310 or KH 420 — without requiring a separate DSP processor.
| 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) |
| DSP Resolution | 32-bit audio; 64-bit double-precision processing |
| Network Audio | Redundant AES67 (ST 2110, ST 2022-7, RAVENNA, DANTE-compatible) |
| AES67 Input Channels | Up to 12 |
| AES67 Sample Rates | 44.1 / 48 / 88.2 / 96 kHz |
| Analog Inputs | 2 x XLR (balanced stereo) |
| Analog Outputs | 2 x XLR + 2 x Sub-D25 (up to 11 channels) |
| Digital Outputs | 7 x BNC AES3 (11 monitor channels + daisy-chain) |
| Latency (A-D-A / AES67 D-A) | 2 ms / 4 ms |
| User-Adjustable Delay | 0 – 115 ms (20.8 µs resolution) |
| 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 |
| Idle Power Consumption | 37 W |
| Cabinet Material | Wood cabinet, aluminum electronics panel |
| Color | Metallic anthracite (RAL 7021) front / Black (RAL 9005) rear |
Key Features
- Redundant AES67 Network Audio — Two 100Base-TX Ethernet ports deliver physically redundant AES67 connectivity compliant with SMPTE ST 2110, ST 2022-7, and RAVENNA, making this subwoofer a proper AoIP hub for broadcast and post-production facilities.
- DANTE Compatibility via AES67 — Accepts Dante-generated AES67 network streams directly, allowing integration into Dante-based routing infrastructure without additional hardware.
- ELFF Dual 10-Inch Woofers — Two in-house modelled 265 mm long-throw drivers with Extremely Linear Force Factor technology maintain low harmonic distortion across the full excursion range, sustaining accurate bass reproduction at high SPLs.
- 16 Hz Low-Frequency Extension — Free-field response extends to 16 Hz (±6 dB), capturing sub-bass content relevant to LFE channels in film post-production and immersive audio formats.
- 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.
- Multichannel Bass Management (up to 7.1.4) — Onboard DSP handles bass management for stereo, surround, and immersive configurations, routing low-frequency content from up to 12 input channels to the subwoofer while distributing high-pass filtered signals to up to 11 satellite monitors.
- 64-Bit Double-Precision DSP — Internal signal processing uses 64-bit double-precision arithmetic for maximum headroom and minimum rounding error across complex multichannel routing and EQ operations.
- Flexible Analog and Digital I/O — XLR stereo I/O, dual Sub-D25 connectors (up to 12 analog inputs / 11 analog outputs), and 7 x BNC AES3 digital outputs cover analog, digital, and mixed signal chains.
- Up to 115 ms Adjustable Delay — Fine-grained time-alignment (20.8 µs resolution) compensates for physical placement offsets in large rooms or complex speaker arrays.
- Universal Power Supply — Switched-mode power supply accepts 100–240 V / 50–60 Hz globally; standby power draw is 300 mW or less.
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 |
| Frequency Response Ripple (20–295 Hz) | ±1.5 dB |
| 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 (electronically balanced) |
| Analog Input Impedance | >12 kΩ |
| Max Analog Input Level | 24 dBu (CH 1–3, 12); 21 dBu (CH 5–11) |
| Analog Dynamic Range (XLR, 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; 1 x Sub-D25 (7 ch); 1 x Sub-D25 (4 ch) |
| Digital Input | 1 x BNC (daisy-chain in); 2 x RJ-45 Ethernet (AES67 primary + secondary) |
| Digital Outputs | 7 x BNC AES3 (11 monitor channels + daisy-chain out) |
| AES67 Input Channels | Up to 12 |
| AES67 Input Word Length | 24-bit |
| AES67 Sample Rates | 44.1 / 48 / 88.2 / 96 kHz |
| AES67 Packet Times | 125 µs, 1 ms |
| PTP Profiles | IEEE 1588 Default, AES67 PTP Media, IEEE 802.1AS (AVB), SMPTE ST 2059-2 |
| Network Redundancy | SMPTE ST 2022-7 physical redundancy |
| Discovery / Connection Management | SAP, mDNS, NMOS IS-04, NMOS IS-05, RAVENNA (RTSP) |
| Latency A-D-A / AES67 D-A | 2 ms / 4 ms |
| User Delay Range / Resolution | 0–115 ms / 20.8 µs |
| Digital Sensitivity | -18 dBFS = 100 dB SPL at 1 m |
| Dynamic Range D-A (CH 1–3, 12 / CH 5–11) | 125 dBA / 118 dBA |
| 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 | 37 W |
| Full-Output Power Consumption | 462–485 W |
| 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 | 700285 |
Frequently Asked Questions
Q: Which Neumann KH-line studio monitors are compatible with the KH 870 II AES67?
The KH 870 II AES67 is designed as the bass extension for mid-size and large Neumann KH-line monitors, including the KH 420 (a primary pairing), KH 310 A, KH 150, KH 150 AES67, and the KH 120 II series. The sub's onboard DSP can handle crossover, bass management, and MA 1 room correction for both analog and DSP-equipped KH monitors simultaneously in systems up to 7.1.4.
Q: How does AES67 network audio work on the KH 870 II AES67, and is it compatible with Dante?
The KH 870 II AES67 uses two 100Base-TX Ethernet ports for AES67 Audio over IP, with physical redundancy per SMPTE ST 2022-7. It supports RAVENNA, NMOS IS-04/IS-05 connection management, SAP, and mDNS discovery. While it is not a native Dante device, it accepts Dante-generated AES67 streams directly — meaning it integrates into Dante networks without requiring a separate AES67 bridge, provided the Dante controller is configured to send AES67-compliant multicast or unicast streams.
Q: Can the KH 870 II AES67 receive audio over the network and distribute it to analog monitors?
Yes. The subwoofer accepts up to 12 channels of AES67 network audio and distributes the high-pass filtered satellite signals to up to 11 connected monitors via analog XLR, Sub-D25, and AES3 (BNC) outputs. This makes it a complete AoIP-to-analog hub, suitable for facilities transitioning to network audio while maintaining analog speaker connections.
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). When used with the KH 870 II AES67, it performs full-system frequency and phase correction — including FIR phase linearization — for the subwoofer and all connected analog KH-line monitors. For surround and immersive configurations, the MA 1 Multichannel Extension is also available separately. The KH 870 II AES67 has sufficient onboard DSP to run MA 1 correction for the entire system.
Q: Where should the KH 870 II AES67 be placed in a large mixing or broadcast room?
Neumann recommends floor placement. SPL output increases with room boundary reinforcement: 114.9 dB in half-space, 117.9 dB against a wall, and 120.9 dB in a corner. For mixing applications, center placement between the main stereo pair is typical. For surround and immersive installations, the sub's adjustable delay (0–115 ms, 20.8 µs resolution) and the MA 1 alignment software allow precise time-alignment relative to satellite monitors regardless of placement.
Q: What is the difference between the KH 870 II AES67 and the standard KH 870 II?
Both units use the same dual 10-inch ELFF driver platform, 360 W amplifier, 16 Hz low-frequency extension, and multichannel bass management. The AES67 variant adds two dedicated Ethernet ports for redundant AES67 network audio input (up to 12 channels), SMPTE ST 2110/ST 2022-7 compliance, NMOS IS-04/IS-05 discovery and connection management, and RAVENNA compatibility. Facilities without a network audio infrastructure should consider the standard KH 870 II, which uses analog and AES3 I/O exclusively.
Q: What warranty and support is provided?
Neumann products sold through authorized dealers are covered by Neumann's standard manufacturer warranty. For specific warranty terms, service, and support in your region, contact Creation Networks or visit Neumann's official support portal at help.neumann.com. As an authorized dealer, Creation Networks can assist with pre-sale configuration questions, system design, and post-purchase support.
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