7.1High Definition
Studio Subwoofer
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 HD-DVD and Blu-ray
High Definition formats that has increased the audio channel count to 7.1. There are currently no monitoring
systems on the market with built-in 7.1 signal handling.
The O 870 and O 810
are an answer to the most recent evolution of
transmission formats. Klein + Hummel’s two new subwoofer packages offer 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 of both models extends down to 18 Hz.
The O 900 and O 800 continue to be offered in addition to the new
7.1
Move up to
High Definition
O 810 and O 870 subwoofers. These two subwoofers take a slightly different approach. The O 900 is designed
to be added to the O 500 C to make a 4-way column system: the subwoofer output signal of the O 500 C is
connected to an external amplifier which can be remote located. The O 800 is a very cost effective solution
for bass managing three channels to extend the response of the front loudspeaker. Both the O 900 and O 800
can be used to only reproduce the LFE channel in multichannel systems. Alternatively a Pro M 1012 can be
used to provide flexible external bass management and system control of up to 10 audio channels and 12
loudspeakers: subwoofer signals are generated and then connected directly to the subwoofer.
All of Klein + Hummel’s subwoofers are designed to
complement Klein + Hummel’s extensive range of monitors. Subwoofers can be used on their own, or daisychained to make larger systems capable of higher SPL. They can be used in music, broadcast, and post
production studios for tracking, mixing, and mastering. They 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 the Klein + Hummel range.
32 | 33
Studio Subwoofer
Flexible
bass management modes
Extensive
acoustical controls
including a parametric
equalizer
7.1 High Definition Bass Management on the O 870 and O 810
Features
M
M
M
M
8 inputs
M
with ground lift, 7 main
outputs and a sum out
M
Switchable
mains voltage and
remote power on
M
M
M
M
M
M
Built-in 7.1 multichannel
remote volume control
Four LFE modes
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:
A LFE to subwoofer and left/right
A LFE to subwoofer only up to 80 Hz
A LFE to subwoofer only up to 120 Hz
A 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 (SRC 1 and SRC 2) or RS-232
Acoustical controls adapt the subwoofer’s response to the environment
A Output level
A Low cut
A Parametric equalizer
A 45° step phase control with a built-in test signal
Larger systems and Plane Wave Bass Arrays™ maybe constructed using the Sum output
Electronics can be remotely powered on with two modes of operation (0 V and 12 V trigger)
Integrated electronic limiter for amplifier and driver protection
Low heat dissipation amplifiers
Optional 8-channel (4 x AES3 / AES3id / S/P-DIF) digital input card, supporting IEC 60958-1
user bit volume control
Remote Electronics Kit (REK 2) and Subwoofer Cables (SC nn) for less cabling and convenience of use
Low cut
Parametric Equalizer
for all format types and
system configurations
0.005
0.02
0.1
0.5
1 kHz
dB
dB
0
0
–5
–5
– 10
– 10
– 15
0.005
0.02
0.1
0.5
1 kHz
– 15
36 | 37
THD at XXX dB/SPL in X,X m
dB
100
dB
– 10
– 20
90
– 30
– 40
80
– 50
– 60
70
Studio Subwoofer
Frequency Response XXX
– 70
– 80
60
The O 870 active studio subwoofer, with built-in 7.1
0.05
0.2
0.5
1
2
5
10 kHz
0.05
0.2
0.5
1
2
5
– 90
kHz
High Definition Bass Management™, offers all the features required in today’s modern studios.
Extensive signal processing and extended low-frequency output at high SPL presents the opportunity to
Group
delay XXX
make very large multi-channel audio systems.
Max. SPL in 1 m at 1 %
and 3 %
THD
dB
ms
Features
M
Low frequency extension for main loudspeakers down to 18 Hz
20
Low distortion magnetically shielded long-throw
drivers
M Reduced bass compression at high SPL from generously proportioned bass reflex ports
M A main loudspeaker can be mounted onto an O 870 to make a large 4-way column system
0
M Allows main loudspeakers to play louder and
with lower distortion
M Large system with 6 dB higher output than O 810
M Wooden cabinet with a tough painted finish (anthracite or silver) and high density rubber isolating feet
– 20to minimal cabinet resonances
M Excellent self-damping properties leading
M Cabinet look conforms to the family design
M Accessories: Digital input card, Remote controls and cables, Remote electronics kit and cables,
case and
0.05Flight 0.2
0.5 Various
1
2 mounting
5 10accessories
kHz
0.05
0.2
0.5
1
2
5 kHz
110
M
O
870
High Definition Active
Frequency response O 410 C with O 870
Studio Subwoofer
100
90
80
70
Group delay O 410 C with O 870
dB
ms
100
20
90
0
80
– 20
70
0.05
0.2
0.5
THD at 95 dB SPL at 1 m
1
total
2
2nd
5
10kHz
60
0.05
0.2
0.5
1
2
MAX. SPL O 870 at 1 m at 1 %
3rd
5
10 kHz
and 3 %
THD
dB
dB
– 10
110
– 20
– 30
100
– 40
90
– 50
– 60
80
– 70
70
– 80
50
100
200
Hz
– 90
60
50
100
200
Hz
38 | 39
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