Neumann KH 870 Active Subwoofer

The Neumann KH 870 Active Subwoofer is a 7.1 analog bass managed subwoofer designed to extend the bass for loudspeakers down to 18 Hz. With very deep bass response, and high maximum SPL, the KH 870 complements Neumann's extensive range of monitors.

The Neumann KH 870 Active Subwoofer 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 ensures 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 allows for centralized system control independent of the source, and the electronics can be remote located to reduce cabling. From Mono to 3D, there are uses for the Neumann KH?870 in many different system configurations.

Improving Lateral Consistency
The latest amplifier technology and acoustical components have been used to ensure the most accurate sound reproduction possible. Robust drivers, a rock-solid cabinet, and carefully designed ports guarantee a tight, articulate, and distortion-free low frequency reproduction, even at high replay levels. Using the sum output, Plane Wave Bass Array™ (PWBA™) techniques acoustically improves lateral consistency in the listening area. The bass extends down to 18 Hz.

Flexible Mounting Options
The Neumann KH 870 Active Subwoofer is designed to complement Neumann's extensive range of monitors, and can be used on its own, or daisy-chained to make larger systems capable of higher SPL. The Neumann KH 810 Active Subwoofer can be used in music, broadcast, and post production studios for tracking, mixing, and mastering. The cabinet can be positioned next to a wall or flush mounted into a wall due to the front mounted port, and can be mixed freely in multichannel systems with other loudspeakers from Neumann's range.

Neumann KH 870 Active Subwoofer Applications

• 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

Neumann KH 870 Active Subwoofer Features

• 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 leading to minimal cabinet resonances
  • No standing wave resonances inside cabinet
  • Reduced cabinet resonances
• In-house modelled 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 pistonic 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
• 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 subwoofer and left/right
  • LFE to subwoofer only up to 80 Hz
  • LFE to subwoofer only up to 120 Hz
  • LFE to 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
• position phase control (with built in test tone), continuous low cut control and parametric equalizer
  • More control in diverse acoustical environments
  • 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 robust to poor quality mains supply
  • Electronics can be remotely powered on with two modes of operation (0 V and 12 V trigger)
• Ground lift
  • Reduced noise in electrically noisy environments and over-comes ground loops
• Sum output
  • Larger systems and Plane Wave Bass Arrays™ maybe 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 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
• Installation flexibility
  • Remoteable electronics (REK 3) for ease of installation, less cabling, and convenience of use

Neumann KH 870 Active Subwoofer Specifications

• Acoustics:
  • -3 dB Free Field Frequency Response ±3 dB: 18 Hz to 300 Hz
  • Pass Band Free Field Frequency Response ±2 dB: 19 Hz to 300 Hz
  • Total Harmonic Distortion 0.5 % at 95 dB SPL at 1m: > 40 Hz
• Electronics:
  • Amplifier Continuous (Peak) Output Power: 320 W (400 W)
  • THD and Noise at Continuous Load: < 0.1 % (-60 dB) with Deactivated Limiter
  • Controller Design: Analog , Active
  • Crossover Frequency at Main Channel: 80 Hz
  • Acoustical Control/ Low Cut:
    • Center Frequency: 30 Hz
    • Q Factor: 1.5
    • Gain Range: 0 to -12 dB
  • Acoustical Control Parametric Equalizer: Bypassable
    • Gain: +4 to -12 dB
    • Frequency: 20 Hz to 120 Hz
    • Q Factor: 1 to 8
  • Input Sensitivity: -12 dB ... +2 dB
• Analog Inputs and Outputs:
  • Input /Output Channel: 7.1 / 7+Sum
  • Impedance Electrically Balanced: XLR, 13 k?
  • Input Sensitivity: -8 dBu/ +6 dBu (Switchable)
  • CMMR of Inputs: > 60 dB at 15 kHz
  • Max. Input Level: +19 dBu (6.9 V)
  • Cross-Talk between Channels 1 kHz: < -95 dB
  • Level Matching: < -95 dB
  • Dynamic Range THD+N: 119 dB(A), < 0.001% at -100 dB
  • LFE Modes: 80 +Re-routing, 80, 120, Full Range
  • LFE Range: 0 dB / +10 dB (Switchable)
  • Gain Control: +2 ....-12 dB
• Product Properties:
  • Power Supply: 100 to 240 V~ (Switchable), 50/60 Hz
  • Power Consumption (Idle, Full Output): 25 W (550 W)
  • Dimension (H x W x D): 735 mm x 330 mm x 645 mm
  • Weight: 47.1 kg (103.6 lbs)
  • Driver(s): Magnetically Shielded 2 x 265 mm (2 x 10")

Neumann KH 870 Active Subwoofer Includes

• 1 x Neumann KH 870 Active Subwoofer
• 1 x Power Cable
• 1 x Quick Start Guide
• 1 x Safety Guide
• 2 Year Warranty