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In the pack there is a separate mains adaptor, suitable for connecting to the mains
voltage supply in the country of use. The socket at the end of the fixed cable should
be firmly inserted into the connector on the OBH-10 rear panel marked DC inlet.
Remember, do not overload the mains wall socket with too many plugs or adaptors. If
in doubt, please contact your supplying dealer or a qualified electrician. The OBH-10
draws less than 2 Watts of power from the mains under all conditions so it can safely
be left switched on without increasing your electricity bill significantly.
INPUT AND OUTPUT CONNECTION
The input and output connections are Phono (RCA) or Cinch type. These connections
are suitable only for regular unbalanced signals (where the signal wire is normally
shielded by an outer braid which is at ground potential). It can be connected to an
integrated amplifier in the tape loop or between tape output and tape input (activated
by selecting Tape monitor). It can also be fitted in the signal path between a pre-
amplifier output and power amplifier input.
The integrated amplifier or pre-amplifier's own volume control should then be pre-set to
maximum to allow the OBH-10 to take full control of the volume. Alternatively, if the
level is too high, set the amplifier's volume control to the maximum level you require
and then only make level adjustments through the OBH-10's volume control. This will
ensure a smoother range of adjustment.
It is also possible to fit the OBH-10 between a source component, say a CD player
output, and the amplifier's input, thereby remotely controlling only the source compo-
nent's volume.
VOLUME LEVEL
The volume control, situated on the right hand side of the front panel, is used to alter
the relative level of the sound output from the amplifier. It is important to realise that
the volume control only acts to reduce, or attenuate, the incoming signal to the power
amplifier stage. The maximum power of the amplifier is available only if the level of
signal available from the line level equipment is sufficient to drive it to clipping; this will
be different from one make to another. The volume control is therefore also used to
balance the level from one piece of equipment to another.
If it is found necessary to have the volume control set to a position which is considered
to be high, before the desired level of volume is obtained, it does not necessarily mean
that the amplifier is having to work hard or "flat-out". Consult your dealer if you feel
you need more advice.
Always have the volume control set at minimum (counter-clockwise ) when switching
your amplifier on and off, to avoid thumps or sudden loud noises.
LOCATING THE OBH-10
The OBH-10 does not need mains power to manually operate the volume. It does,
however, need to be powered from its adaptor to operate the volume and mute func-
tions via remote control. The OBH-10 will work best if placed on a suitable table or
Hi-Fi equipment cabinet. Should it be necessary to place the OBH-10 on the top of
other audio or video equipment, be careful to avoid obstruction of any ventilation slots
that could cause overheating, or internal mains transformers that could induce hum
pick-up. Do not obstruct the vision of the IR sensor on the front panel.
OPERATING THE OBH-10
The OBH-10 has the ability to change the volume setting manually by moving the con-
trol knob on the front of the unit or by pressing the appropriate buttons at the bottom of
the Creek amplifier remote control handset. By pointing the remote handset at the
OBH-10 and pressing the volume up or down buttons, the motorised potentiometer will
move the control knob and flash the status indicator LED.
Pressing the MUTE button on the handset will cause a relay to cut the signal from the
OBH-10 and change the LED status indicator to red. To unmute press the mute button
again or the volume up button (volume down will not unmute the signal). To unmute
the OBH-10 without the handset, remove the power for 10 secs.
You will notice that the remote handset has several other buttons relating to input
selection. These buttons are redundant with the OBH-10. They are reserved for oper-
ation with other Creek R.C. amplifier products.
CAUTION
Your OBH-10 amplifier is designed to give you years of reliable use. However, it is
necessary to take care of your possession, so never overheat it or use a different
power supply adaptor, unless it is one recommended by Creek Audio Ltd.
The OBH-10 is designed to comply with the latest European EMC requirements.
However, it should be noted that it is not possible to guarantee faultless operation of
the equipment if it is used close to the source of high powered radio transmissions,
such as can be found in mobile telephones or CB radio etc. Care should also be
taken to place it away from the source of mains interference caused by mains trans-
formers in other equipment. Electrical switching noises periodically conducted down
the mains supply from domestic or industrial heating systems can sometimes be ampli-
fied and present themselves as a click or thump through a hi-fi system.
If you suspect that a fault has developed, do not remove the cover plate; there are no
user serviceable parts inside. If you are unfortunate enough to need service work to
be carried out on the OBH-10, it should be returned to your dealer for his expert help
in the original packing material, if possible.
