Klein + Hummel O 800 Installation And Operation Manual

Installation and Operation

Part Number: 519209
Version: 01
Date: 9-Apr-2010
Language: English

O 800

Active Studio Subwoofer

Page 2 Active Studio Subwoofer O800

O 800 Active Studio Subwoofer

Installation - Operation

Figure 1: Front O 800

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Figure 2: Input section O 800 (rear)

Active Studio - Subwoofer O 800 Page 3

1. Connections and Operation

It is absolutely essential that you read and
observe the Safety Instructions in Section 4
before connecting or using this device.

1.1 Operating Conditions

The K+H model O 800 active studio subwoofer
model is intended for use over a range of ambient
temperatures from +10° C to +40° C (+50° F to
+104° F). During transport or storage,
temperatures from -25° C to +70° C (-13° F to
158° F) are permissible.

1.2 Installation

The loudspeaker chassis used in the O 800 is
magnetically shielded, making it possible to set
this unit directly next to a computer without fear
of altering the data on its hard drive. Similarly,
this unit can be positioned under or next to video
or computer monitors without adversely affecting
the screen. The subwoofer is intended to be used
in an upright position, resting solidly on the floor.
If you place the unit near a wall, please leave at
least 8 inches (20 cm) of space before the wall
to ensure proper cooling of the integral amplifier.

1.3 Connection to Mains Current (AC Power)

쐃

The amplifier electronics are set up for an AC
line voltage of 230 volts, 50 or 60 Hz. For export,
special versions with other AC voltages are also

available. If the mains power cable
should ever become damaged, it may
not be repaired, but must be replaced.

1.4 POWER Switch 쐇

When you switch on power to the unit, there is
a three-second delay before the amplified signal
is sent to the subwoofer, as well as to the outputs
for the satellite loudspeakers. This delay avoids
the loud popping sounds that otherwise may be
generated by devices earlier in the signal chain
as power reaches them. You will find this
arrangement particularly useful if your studio uses
a master switch to power up all the equipment
at once. When power on the O 100 is turned
off, on the other hand, or if there is a general
power failure, the signal flow to the speaker is
immediately cut off, preventing any loud pops. A
green LED in the power switch itself indicates
that the unit is switched on and ready to go.

1.5 Inputs 쐋

The sensitivity of the three electronically balanced
inputs is -6 dBu (0.388 volt) referenced to
maximum output of the subwoofer. The setting
has no influence on the audio outputs. The 3-pin
XLR jacks (female) are wired in the standard
manner (pin 1 = ground, pin 2 = +, pin 3 = - ).
The inputs are modular and can optionally be

ordered as transformer-balanced, floating inputs.

1.6 Outputs 쐏

The outputs are electronically balanced and are
intended to be connected to active monitor
inputs. In normal operating mode, the signal at
each channel of these outputs is identical to that
which came into the corresponding input channel,
with the exception that the output signal only
contains information above 90 Hz (also see the
sections Center Mode and Bypass). The 3-pin
XLR jacks, male in this case, are wired in the
standard manner (pin 1 = ground, pin 2 = +, pin
3 = - ).

1.7 Subwoofer Level 쐄

This control pot allows you to adapt the output
volume of the subwoofer to any monitor
loudspeakers, and can be varied within an 18
dB range.

In setting up your subwoofer for best results,In setting up your subwoofer for best results,

In setting up your subwoofer for best results,In setting up your subwoofer for best results,

In setting up your subwoofer for best results,
we urgently recommend that you use thewe urgently recommend that you use the

we urgently recommend that you use thewe urgently recommend that you use the

we urgently recommend that you use the
supplied reference CD (see Section 5), as roomsupplied reference CD (see Section 5), as room

supplied reference CD (see Section 5), as roomsupplied reference CD (see Section 5), as room

supplied reference CD (see Section 5), as room
acoustics and subwoofer placement varyacoustics and subwoofer placement vary

acoustics and subwoofer placement varyacoustics and subwoofer placement vary

acoustics and subwoofer placement vary
widely and therefore demand widely varyingwidely and therefore demand widely varying

widely and therefore demand widely varyingwidely and therefore demand widely varying

widely and therefore demand widely varying
settings.settings.

settings.settings.

settings.

1.8 Subwoofer Phase 쐂

Use this control to adjust for varying distancesUse this control to adjust for varying distances

Use this control to adjust for varying distancesUse this control to adjust for varying distances

Use this control to adjust for varying distances
between the subwoofer and the monitors. Ifbetween the subwoofer and the monitors. If

between the subwoofer and the monitors. Ifbetween the subwoofer and the monitors. If

between the subwoofer and the monitors. If
the loudspeakers are set up the same distancethe loudspeakers are set up the same distance

the loudspeakers are set up the same distancethe loudspeakers are set up the same distance

the loudspeakers are set up the same distance
away fraway fr

away fraway fr

away fr

om each other horizontallyom each other horizontally

om each other horizontallyom each other horizontally

om each other horizontally

, a setting of, a setting of

, a setting of, a setting of

, a setting of
0° is recommended. If the distances are diffe­rent, you will need to use the reference CD in
order to ensure proper settings.

1.9 Low-Cut Filter 쐆

This four-position switch can be used to set the
low-frequency cut-off point of the subwoofer at
30, 40, 50, or 60 Hz, for example to simulate the
sonic character of ”smaller” loudspeakers. It also
reduces the subwoofer level in steps of
approximately 1 dB.

1.10 Center Mode 쐊

Use this control to switch the center input and
output from Normal mode to broad-band
operation (”sub direct”) if you are using the LFE
output of a surround-sound amplifier. In this
mode, the Center input signal is sent unfiltered
to both the subwoofer and the Center output.

NORMALNORMAL

NORMALNORMAL

NORMAL

In this mode, the signals of all three inputs are
electronically summed and sent through a 90
Hz low-pass filter to the subwoofer. The signal at
the other outputs then has content only above
90 Hz. This is the recommended setting in those
cases where the three front signals (Left, Cen-

Page 4 Active Studio - Subwoofer O 800

ter, Right) are going to a surround-sound system.

SUB DIRECTSUB DIRECT

SUB DIRECTSUB DIRECT

SUB DIRECT

In Sub-Direct mode, only the left and right input
signals are electronically summed and sent
through a 90-Hz low-pass filter to the subwoofer,
whereas the signal from the CENTER/SUB­DIRECT input is sent to the subwoofer directly
as a broadband signal, i.e. without filtering out
any of the frequency spectrum. This mode would
then allow a second subwoofer to be added for
the purpose of increasing the overall system
output. This operating mode is recommended
when both rear channels are reproduced by way
of Left and Right and the Effect channel is
reproduced by way of the Center/Sub Direct.

1.11 Ground Lift 쐎

Since the inputs are balanced, it should rarely
happen that you encounter problems with hum.
In unusual cases or if the source is unbalanced,
it may become necessary to lift the signal ground
from the chassis ground. To do so, simply move
the GROUND switch to the LIFTED position. In
the CONNECTED position the chassis ground
and the signal ground are connected to each
other by way of a fuse-resistor. However, the
chassis ground always remains connected to the
protective earth conductor of the mains cable.

1.12 Bypass 쐅

Use this switch if you wish to mute the subwoofer
for purposes of evaluating the sound of the system
without any low-frequency reinforcement. In the
position SUB BYPASS, all outputs are fed
broadband signals from their corresponding
inputs (without the 90-Hz high-pass filtering),
whereas in the position NORMAL, the subwoofer
operates in the manner we already described.

1.13 Bypass Remote 쐈

With a standard on/off single-pole footswitch
connected to this jack, you can operate the
bypass function remotely.
Please note that this jack takes precedence over
the BYPASS switch, i.e., when this jack is
occupied by a ¼” phone plug, the BYPASS switch
is disabled.

Footswitch open = NORMAL
Footswitch closed = BYPASS

1.14 Mains Fuse 쐉

When replacing the fuse,

first disconnect thefirst disconnect the

first disconnect thefirst disconnect the

first disconnect the

mains cablemains cable

mains cablemains cable

mains cable and ensure that the new fuse is of
the following type:

for 230 volts AC: 1.6 A Slo-Blo (5 x 20 mm)
for 117 volts AC: 3,15 A Slo-Blo (5 x 20 mm)
for 100 volts AC: 3,15 A Slo-Blo (5 x 20 mm)

1.15 Power Indicator LED 씈

The green LED built into the power switch will
illuminate to confirm that the subwoofer is
operational.

1.16 Care of the Cabinet

The cabinet housing of the K+H O 800 active
studio subwoofer comes standard with an
anthracite-colored enamel finish (RAL color 7021).
Take care when handling the unit not to damage
the finish. To clean the cabinet, use a soft cloth
with a mild cleaning agent only. Under no
circumstances should you use alcohol-based or
chemical agents, nor any cleaners with abrasive
action.

2. Warranty Information

All K+H products undergo an extensive
procedure of quality control testing before leaving
the factory. Before semiconductors are mounted
on the circuit board, they are subject to rigorous
tests. Every single unit is guaranteed to match
its technical specifications within strict
predetermined tolerances.
Please store the original carton in a safe, dry
place. If you should ever need warranty service,
put the unit in its original packing material and
carton together with a detailed description of the
problem, and ship it (freight prepaid) to our
distributor or directly to

K+H warrants, that the product is free from any
defects in both material and manufacturing and
that it meets the specifications. A warranty case
can only be acknowledged under condition that
the complaint is filed to our distributor or to us in
writing

within 8 dayswithin 8 days

within 8 dayswithin 8 days

within 8 days after delivery or detection
of the fault. Not covered under this warranty are
damages due to inexpert packing and shipment,
wear and tear, improper handling, installation,
operation and maintenance.
The limitation period for warranty claims is
described in the terms and conditions of K+H
GmbH. Its our choice to repair, to supply a new
product or to withdraw from the contract.
In the event warranty service is required,
presentation of a warranty card will not be
necessary. Proof of purchase date can be made
by filing copies of appropriate documents (invoice,
delivery note).

3. Diagrams

The outstanding sonic impression made by the
O 800 active studio subwoofer in listening tests
is confirmed by the most advanced technical test

y

your dealer.