Neumann - Active subwoofer



Flexible electronics

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• 7.1 Channel High Definition Bass Management™ compatible with all formats from mono to 7.1
  
• Bypassable 4th order 80 Hz active crossover for maximum compatibility with consumer reproduction
  
• 0 and +10 dB LFE gain and 4-mode LFE processing:
  
• 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
  
• Independent control of bass management for front and back channels
  
• System wide volume control via optional hardware remote controls or RS-232
  
• Acoustical controls adapt the subwoofer’s response to the environment
  
• Output level
  
• Low cut
  
• Parametric equalizer
  
• 45° step phase control with a built-in test signal
  
• Larger systems and Plane Wave Bass Arrays™ maybe constructed using the Sum output
  
• Remoteable electronics (REK 3 and an SC nn) for installation convenience, less cabling, and convenience of use
  
• Integrated electronic limiter for amplifier and driver protection
  
• Low heat dissipation amplifiers
  
• Electronics can be remotely powered on with two modes of operation (0 V and 12 V trigger)
  

Robust drivers and cabinet

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• Low frequency extension for main loudspeakers down to 18 Hz
  
• Low distortion magnetically shielded long-throw drivers
  
• Reduced bass compression at high SPL from generously proportioned bass reflex ports
  
• Large system with 6 dB higher output than KH 810
  
• A main loudspeaker can be mounted onto an KH 870 to make a large 4-way column system
  
• Allows main loudspeakers to play louder and with lower distortion
  
• Wooden cabinet with a tough painted finish (anthracite or silver) and high density rubber isolating feet
  
• Excellent self-damping properties leading to minimal cabinet resonances
  
• Cabinet look conforms to the family design
  

NEUMANN KH 870 G SPECIFICATIONS

Acoustics    

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• −3 dB free field frequency response: 18 - 300 Hz, ± 3 dB
  
• Pass band free field frequency response: 19 - 300 Hz, ± 2 dB
  
• Self-generated noise level at 10 cm: < 20 dB(A)
  
• Total harmonic distortion < 0.5 % at 95 dB SPL at 1 m: > 40 Hz
  
• Max. SPL In half space at 3% THD: 116.7 dB SPL
  
• Max. SPL with pink noise in half space at 1 m: 118 dB SPL
  
• Averaged between: 40 and 90 Hz
  

Electronics

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• Amplifier, cont. (peak) output power (THD < 0,1 %): 320 W (400 W)
  
• Controller design: Analog, active
  
• Main channel crossover frequency: 80 Hz
  
• Crossover slope: 24 dB/oct
  
• Equalization - Low cut: 30 Hz, 0 … −12 dB
  
• Parametric Equalizer: Bypassable
  
• Parametric Equalizer - Gain: +4 … −12 dB
  
• Parametric Equalizer - Frequency: 20 … 120 Hz
  
• Parametric Equalizer - Q: 1 … 8
  
• Time of Flight adjustment delay: 0 … 4.69 ms @ 80 Hz (4-step 0, 45, 90, 135), - 180° Switch
  
• Volume Control: Hardware remote or RS-232
  
• Calibration Tools: Internal signal generator
  
• Protection circuitry: Peak and Thermo Limiters
  
• Infrasonic filter frequency; slope: 6.5 Hz; 12 dB/oct.
  
• Remote control: On a CAT-5
  
• Analog Inputs and Outputs    
  
• Input/Output channels: 7.1 / 7+Sum
  
• Impedanz electrically balanced: XLR, 13 kΩ
  
• Input sensitivity: −8 and +6 dBu
  
• Max. input level: +19 dBu (6.9 Vrms) / per channel
  
• CMRR: > 60 dB @ 15 kHz
  
• Interchannel isolation (1 kHz), level matching: −95 dB, ±0.1  dB
  
• Volume control range, resolution: 118 dB, 0.25 dB
  
• Dynamic range, THD+N: 119 dB(A), <0. 001% (−100 dB)
  
• LFE Modes: 80+re-routing, 80, 120, wide
  
• LFE Gain: 0 / +10 dB
  
• Gain Control: +2 … −12 dB
  
• Displays and indicators:
  
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  • power on: Red LED
    
  • limit/clip: Red LED “Flashing”
    
  • bass management active: Green LED
    
  
  
  
• Mains power: 220 - 240 / 100 - 120 V AC (switchable)
  
• Power consumption - Idle: 25 W
  
• Power consumption - Full output: 550 W
  

Mechanics    

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• Cabinet surface finish: Painted
  
• Color: standard: Anthracite (RAL 7021)
  
• Baffle cover: Included metal grille
  
• Drivers: Magnetically shielded
  
• Woofer: 2 x 265 mm (10")
  
• Height x width x depth: 735 x 330 x 645 mm (28.9" x 13" x 25.4")
  
• Internal net volume: 86 l
  
• External volume: 156 l
  
• Weight: 47,1 kg (103.6 lbs)
  
• Delivery includes: 1x KH 870
  
• 3x Power cables (Euro, UK, USA)
  
• 1x Operating manual
  
• 1x Supplement "Getting Started Quickly"