Neumann KH 810 II AES67 – Subwoofer with DSP and AES67 Support

OVERVIEW

Powerful Bass Extension for Immersive Systems

The KH 810 II AES67 is designed to provide precise, powerful low-frequency reproduction in medium-sized monitoring rooms. Its next-generation acoustic design combines a long-throw 10-inch woofer with Extremely Linear Force Factor™ technology and intelligent protection limiters, achieving remarkably low distortion even when operating at maximum SPL. With bass reproduction extending down to 16 Hz and approximately twice the output of the KH 750 DSP, it is an ideal match for mid-sized Neumann monitors such as the KH 150 and KH 310. The rigid wooden cabinet, efficient front-ported bass reflex design and extremely low group delay contribute to tight, controlled bass with inaudible port noise.

DSP-Controlled Monitoring and MA 1 Integration

The KH 810 II AES67 incorporates powerful active DSP processing for precise system integration and can be calibrated using the MA 1 Automatic Monitor Alignment system, sold separately. MA 1 can automatically optimise both frequency response and phase across an entire stereo, surround or immersive monitoring system up to 7.1.4. Analog Neumann KH Line monitors, including the KH 120 A, KH 310 and KH 420, can be integrated alongside DSP-equipped monitors, with the optional MA 1 Multichannel Extension enabling room alignment of mixed analog and DSP-based systems. This makes the KH 810 II AES67 more than a conventional subwoofer: it can serve as the central bass-management and monitoring hub for upgrading an existing system or extending it into immersive audio.

Redundant AES67 Audio-over-IP Connectivity

The defining feature of the AES67 version is its fully redundant Audio-over-IP interface. Two network ports provide redundant AES67 connectivity with support for up to 12 channels of network audio, allowing the subwoofer to act as a central hub for a complete networked monitoring system. Network audio can be processed by the KH 810 II AES67 and distributed to up to 11 additional Neumann studio monitors through its analog and AES3 BNC outputs, with internal bass management handling the system configuration. It supports professional AoIP standards and technologies including SMPTE ST 2110, ST 2022-7 redundancy, RAVENNA, NMOS and AES67 streams generated by Dante® systems.

KEY HIGHLIGHTS

Deep, Powerful Bass Down to 16 Hz

The KH 810 II AES67 extends the monitoring system’s low-frequency response down to 16 Hz, providing substantial bass extension for critical music production, film scoring, broadcast, post-production, mixing and mastering applications.

Next-Generation 10-Inch Long-Throw Woofer

Its in-house designed 265 mm (10-inch) long-throw driver incorporates Extremely Linear Force Factor™ technology, a resonance-optimised basket and carefully controlled breakup modes. The result is exceptionally low harmonic distortion, reduced air noise and improved mechanical stability at high excursion levels.

Multichannel Bass Management up to 7.1.4

The integrated Bass Manager provides flexible multichannel signal management for stereo, surround and immersive monitoring systems up to 7.1.4, making the KH 810 II AES67 particularly suited to modern immersive production environments.

Fully Redundant AES67 Audio-over-IP

Two Fast Ethernet RJ-45 network ports provide physically redundant AES67 connectivity using ST 2022-7, with support for professional networked-audio standards including ST 2110 and RAVENNA.

Central AoIP Monitoring Hub

Up to 12 channels of network audio can be received by the KH 810 II AES67 and distributed through its analog and AES3 outputs to as many as 11 additional studio monitors, incorporating the subwoofer’s internal bass-management functions.

MA 1 Automatic Monitor Alignment

DSP processing allows the subwoofer and connected analog KH Line monitors to be automatically room-aligned with MA 1, including frequency-response optimisation and FIR-based phase linearisation.

Flexible Analog and Digital Connectivity

Alongside redundant AES67 networking, the KH 810 II AES67 provides electronically balanced XLR and Sub-D25 analog connectivity plus seven BNC AES3 outputs for multichannel digital monitor connections.

Precision Cabinet and Bass Reflex Design

The ultra-stiff wooden cabinet features excellent self-damping, minimal cabinet resonances, no internal standing-wave resonances and integrated rubber feet for acoustic isolation. The front-ported bass reflex system is engineered for tight bass reproduction with extremely low group delay and inaudible port noise.

Advanced Protection and Reliability

Soft clipping, peak limiting, woofer excursion protection and separate thermal protection for the voice coil, electronics and amplifier allow the system to deliver high performance while maintaining reliability and operational safety.

Efficient Universal Power Supply

The universal 100–240 V switched-mode power supply works worldwide and is designed to remain robust even with poor-quality mains supplies. An automatic Standby mode reduces power consumption when the subwoofer is not being used.

FEATURES

• Reference-quality DSP-controlled subwoofer for medium-sized rooms
• Bass extension down to 16 Hz
• Approximately twice the output of the KH 750 DSP
• 265 mm (10-inch) long-throw woofer
• Extremely Linear Force Factor™ (ELFF™) technology
• Resonance-optimised woofer basket
• Reduced woofer breakup modes and mechanical distortion
• Reduced air noise and improved rocking modes
• Intelligent woofer and amplifier protection
• Flexible Bass Manager for stereo, surround and immersive applications
• Supports multichannel systems up to 7.1.4
• Redundant AES67 Audio-over-IP connectivity
• Two physical AES67 network ports
• ST 2110-compliant network interface
• Physical network redundancy via ST 2022-7
• RAVENNA support
• NMOS IS-04 discovery and registration
• NMOS IS-05 connection management
• Compatible with AES67 network streams generated by Dante® systems
• Supports multicast and unicast transport
• Up to 12 channels of AES67 network audio input
• Network hub functionality for complete monitoring systems
• Analog and AES3 digital distribution to up to 11 additional studio monitors
• Two electronically balanced XLR analog inputs
• Two electronically balanced XLR analog outputs
• Two Sub-D25 analog connections
• Seven AES3 BNC outputs
• AES3 BNC outputs compatible with S/P-DIF inputs on Neumann monitors using a BNC-to-RCA cable
• Daisy-chain input and output for subwoofer arrays
• DSP-controlled active electronics
• 32-bit audio DSP with 64-bit double-precision processing
• 80 Hz crossover
• 24 dB/octave, 4th-order crossover slope
• MA 1 Automatic Monitor Alignment integration
• Automatic room calibration for the subwoofer and connected analog loudspeakers
• FIR phase linearisation for connected analog loudspeakers with MA 1
• MA 1 Multichannel Extension support
• Local or network control
• Remote control via Ethernet and MA 1
• Analog/AES67 input selection
• Ground lift to help eliminate ground loops
• High CMRR inputs for reduced interference over long cables
• Fully symmetrical internal signal path
• Illuminated Neumann logo status indicator
• Software-controlled logo brightness
• Separate indication for normal operation, identification, limiting, clipping, errors and protection
• Universal 100–240 V switched-mode power supply
• Low-heat amplifier design with substantial headroom
• Soft clip, peak and thermal limiters
• Woofer excursion limiter
• Separate thermal protection for electronics and amplifiers
• Automatic Standby after 20 minutes by default
• Standby can be configured or disabled in software
• Rigid, ultra-stiff wooden cabinet
• Integrated rubber feet for acoustic isolation
• Front-ported bass reflex enclosure
• Protective black metal woofer grille
• Painted metallic anthracite front with black rear panel

TECHNICAL SPECS

Acoustics

Free Field Frequency Response ±6 dB: 16 Hz – 750 Hz
Free Field Frequency Response ±3 dB: 18 Hz – 310 Hz
Frequency Response Ripple: 20 Hz – 295 Hz, ±1.5 dB
Self-Generated Noise at 10 cm: <20 dB(A) SPL
Sine Wave Output with THD <0.5% at 1 m in Half Space: 95 dB SPL, 42–200 Hz
Maximum SPL at 1 m, Half Space, 3% THD: 109 dB SPL, averaged 50–100 Hz
Maximum SPL – Floor / Against Wall / Corner: 109 dB / 112 dB / 115 dB
Dolby DARDT Maximum SPL, Bass Managed: 117 dB SPL
Acoustical Principle: Bass-reflex, front ports
Acoustical Axis – Horizontal: 165 mm
Acoustical Axis – Vertical: 183.5 mm from bottom

Analog Inputs & Outputs

Analog Inputs: 2 × XLR, electronically balanced
Analog Input Impedance: >12 kΩ
Maximum Input Level: 24 dBu, CH1–3, 12; 21 dBu, CH5–11

• 18 dBu for CH1–3, 12 at 114/108/100 dB SPL output levels
• 15 dBu for CH5–11 at 114/108/100 dB SPL output levels
• 24 dBu for CH1–3, 12 at 94 dB SPL output level
• 21 dBu for CH5–11 at 94 dB SPL output level

Common-Mode Rejection Ratio, XLR/Sub-D: >56 dB @ 15 kHz
Crosstalk / Level Matching: -90 dB / ±0.1 dB @ 1 kHz
Remote Volume Control: Via MA 1 software
Volume Control Range: 0 to -∞ dB
Volume Control Resolution: 0.1 dB
Analog Dynamic Range / THD+N (A/D/A):

• 120 dB(A), CH1–3, 12
• 116 dB(A), CH5–11
• THD+N: <0.003% (−90 dB)

Signal Routing: Analog
Analog Outputs:

• 2 × XLR, electronically balanced
• 1 × Sub-D25, 7 × electronically balanced
• 1 × Sub-D25, 4 × electronically balanced

Digital Inputs & Outputs

Digital Input:

• 1 × BNC, Daisy Chain In
• 1 × Ethernet, Primary AoIP
• 1 × Ethernet, Secondary AoIP

Digital Outputs:

• 7 × BNC
• 11 × Monitor Out
• 1 × Daisy Chain Out

Digital Converter Resolution: 24-bit
Digital Converter Sampling Rate: 32 kHz – 200 kHz
Internal Sampling Rate: 48 kHz
Output Sampling Rate: 48 kHz
A/D Dynamic Range, CH1–2: 124 dBA
A/D/A converter dynamic range, CH1–2: 121.5 dBA
D/A Dynamic Range

• 125 dBA, CH1–3, 12
• 118 dBA, CH5–11

Digital Sensitivity: -18 dBFS = 100 dB SPL at 1 m
A/D/A Latency: 2 ms
D/A AES67 latency: 4 ms
User-Adjustable Delay: 0–115 ms
Delay Resolution: 20.8 µs / 0.71 mm (0.28″)
Maximum Audio-Video Synchronisation Delay:

• 2 frames / 40 ms at 25 fps
• 2.75 frames / 33 ms at 30 fps

Maximum Time-of-Flight Distance: Based on 115 ms firmware limit

AES67 Audio-over-IP

AES67 Interface: Fully redundant AES67 / ST 2110-compliant Audio-over-IP network interface
Network Connectors: 2 × Fast Ethernet 100Base-TX RJ-45, IEEE 802.3
Physical Network Redundancy: ST 2022-7
AES67 Input Word Length: 24-bit
Supported AES67 Input Sample Rates: 44.1 / 48 / 88.2 / 96 kHz
Connection Management:

• RAVENNA
• NMOS IS-04 Discovery & Registration
• NMOS IS-05 Connection Management

Packet Times: 125 µs, 1 ms
PTP Profiles:

• IEEE 1588 Default
• AES67 PTP Media
• IEEE 802.1AS (AVB)
• SMPTE ST 2059-2

Transport: Multicast, Unicast
SMPTE ST 2110-30: Yes
Physical Network Ports for ST 2110: 2
SDP Transport:

• Manual
• SAP
• RAVENNA Method (RTSP)

Discovery:

• SAP
• mDNS
• NMOS IS-04
• RAVENNA method, advertising RTSP URI and other services

AES67 Network Input Channels: Up to 12

User Interface

Status Indication: Illuminated Neumann Logo
Input Selection: Analog / AES67
Ground Lift: Yes
Control: Local / Network
Mains Switch: Yes
Mains Voltage: Universal 100–240 V

DSP & Electronics

Controller Design: Digital, active
DSP Resolution: 32-bit Audio / 64-bit double-precision processing
Crossover Frequency: 80 Hz
Crossover Slope: 24 dB/octave, 4th order
MA 1 Automatic Room Calibration: Yes – subwoofer and connected analog loudspeakers
FIR Phase Linearization: Yes, for connected analog loudspeakers with MA 1
Protection Circuitry: Soft clip, peak and thermal limiters; woofer-excursion limiter; thermal limiter for electronics and amplifiers
Remote Control: Ethernet and MA 1
Status Display – Normal Operation: White Neumann logo
Status Display – Identification: Rosé Neumann logo
Status Display – Limit / Clip / Errors / Protection / Boot Mute / Shutdown Mute: Red Neumann logo
Logo Brightness: Adjustable via MA 1 software

Amplifier & Power Supply

Woofer Amplifier Output Power: 180 W, THD+N with limiter activated: 0.1%
Power Supply: Switched-mode, 100–240 V AC, 50/60 Hz
Standby Power Consumption: ≤300 mW
Idle Power Consumption: 33 W @ 100 V / 230 V; 32 W @ 230 V
Full Output Power Consumption: 240 W @ 100 V / 230 V; 235 W @ 240 V
Automatic Standby: 20 minutes by default
Amplifier Standby: Disabled; user-defined in software
Auto Standby can be deactivated using MA 1

Mechanics

Cabinet Material: Wooden cabinet with aluminium electronics panel
Finish: Painted metallic anthracite, RAL 7021 front / black, RAL 9005 back
Woofer: 265 mm / 10″, with protective black metal grille
Dimensions (H × W × D): 368 × 330 × 645 mm / 14.5 × 13 × 25.4″
External Net Volume: 78 litres
Product Weight: 25.5 kg / 56 lbs 3 oz
Operating Temperature: +10°C to +40°C / +50°F to +104°F
Operating Humidity: <75% RH, non-condensing
Transport/Storage Temperature: -25°C to +60°C / -13°F to +140°F
Transport/Storage Humidity: <90% RH, non-condensing
Packed Dimensions: 484 × 454 × 749 mm / 19.1 × 17.9 × 29.5″
Packed Weight: 31.3 kg
Packaging Weight Including Cables & Manuals: 5.8 kg
Packed Cube: 0.165 m³
Acoustic Axis Horizontal: 165 mm
Acoustic Axis Vertical from Bottom: 183.5 mm
Colour: Anthracite
Cat. No.: 700283

What’s Included

• 1 × KH 810 II AES67
• Mains cables for EU/KR, UK, US, and China
• Safety guide
• Getting Started Quickly guide
• Operating Manual

DIAGRAMS

KH 810 II / AES67 Frequency response

KH 810 II / AES67 Frequency response Subwoofer + Satellite

KH 810 II / AES67 Group Delay Subwoofer + Satellite

KH 810 II / AES67 Harmonic Distortion at 95 dB SPL

KH 810 II / AES67 Maximum SPL at 1 m