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Neumann
KH 870 Active Studio Subwoofer |
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Product Code:
KH870
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As consumer technology advances at ever faster
rates, professional technology increasingly finds itself trying to keep up. An
example of this is the advent of the Blu-ray and other high definition formats
that have increased the audio channel count to 7.1.
The KH 870 is an answer to these new demands by offering a new 7.1 High
Definition Bass Manager� This is compatible with all standard consumer formats
from mono through to the latest 7.1 HD systems. Eight channels of analog or an
optional 8-channel, 24-bit, 192 kHz digital input card 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
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.
The KH 870 subwoofer is designed to complement our extensive range of monitors,
and can be used on its own, or daisy-chained to make larger systems capable of
higher SPL. The KH 870 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 |
Flexible
electronics
� 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
� 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
Extensive accessories range
� Remote controls (NRC 1, SEA 1) and remote cables (RC 2, RC 5, RC 10, RC 15, RC
20, RC 25, RC 30)
� Remote electronics Kit (REK 3) and driver cables (SC 2, SC 5, SC 10, SC 15, SC
20, SC 25, SC 30)
� Flight case (FO 870) |
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Acoustics |
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−3 dB free field frequency response |
18 - 300 Hz, � 3 dB |
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Pass band free field frequency response |
19 - 300 Hz, � 2 dB |
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Self-generated noise level at 10 cm |
< 20 dB(A) |
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Total harmonic distortion < 0.5 % at 95
dB SPL at 1 m |
> 40 Hz |
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Max. SPL In half space at 3% THD |
116.7 dB SPL |
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Max. SPL with pink noise in half space at
1 m |
118 dB SPL |
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Averaged between |
40 and 90 Hz |
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Electronics |
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Amplifier, cont. (peak) output power
(THD < 0,1 %) |
320 W (400 W) |
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Controller design |
Analog, active |
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Main channel crossover frequency |
80 Hz |
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Crossover slope |
24 dB/oct |
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Equalization - Low cut |
30 Hz, 0 � −12 dB |
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Parametric Equalizer |
Bypassable |
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Parametric Equalizer - Gain |
+4 � −12 dB |
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Parametric Equalizer - Frequency |
20 � 120 Hz |
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Parametric Equalizer - Q |
1 � 8 |
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Time of Flight adjustment delay |
0 � 4.69 ms @ 80 Hz (4-step 0,
45, 90, 135), - 180� Switch |
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Volume Control |
Hardware remote or RS-232 |
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Calibration Tools |
Internal signal generator |
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Protection circuitry |
Peak and Thermo Limiters |
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Infrasonic filter frequency; slope |
6.5 Hz; 12 dB/oct. |
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Remote control |
On a CAT-5 |
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Analog Inputs and Outputs |
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Input/Output channels |
7.1 / 7+Sum |
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Impedanz electrically balanced |
XLR, 13 kΩ |
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Input sensitivity |
−8 and +6 dBu |
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Max. input level |
+19 dBu (6.9 Vrms) / per channel |
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CMRR |
> 60 dB @ 15 kHz |
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Interchannel isolation (1 kHz), level
matching |
−95 dB, �0.1 dB |
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Volume control range, resolution |
118 dB, 0.25 dB |
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Dynamic range, THD+N |
119 dB(A), <0. 001% (−100 dB) |
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LFE Modes |
80+re-routing, 80, 120, wide |
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LFE Gain |
0 / +10 dB |
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Gain Control |
+2 � −12 dB |
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Displays and indicators: power on |
Red LED |
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- limit/clip |
Red LED �Flashing� |
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- bass management active |
Green LED |
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Mains power |
220 - 240 / 100 - 120 V AC (switchable) |
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Power consumption - Idle |
25 W |
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Power consumption - Full output |
550 W |
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Mechanics |
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Cabinet surface finish |
Painted |
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Color: standard |
Anthracite (RAL 7021) |
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Baffle cover |
Included metal grille |
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Drivers |
Magnetically shielded |
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Woofer |
2 x 265 mm (10") |
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Height x width x depth |
735 x 330 x 645 mm (28.9" x 13" x 25.4") |
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Internal net volume |
86 l |
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External volume |
156 l |
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Weight |
47,1 kg (103.6 lbs) |
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Delivery includes |
1x KH 870
3x Power cables (Euro, UK, USA)
1x Operating manual
1x Supplement "Getting Started Quickly" |
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