Creek Audio OBH22 User's Manual
Contents
1. INPUT IMPEDANCE OUTPUT IMPEDANCE SEPARATION ATTENUATION INPUTS OUPUTS RELAY MUTING FACTOR POWER REQUIREMENTS POWER CONSUMPTION DC CONNECTOR TYPE INPUT amp MUTE INDICATION SIZE WEIGHT CREEK OBH 22 SPECIFICATION lt 20 kQ 0 20 KQ gt 80 dB s 1kHz 0 90 dB s 3 Stereo pairs inc Tape 2 Stereo pairs 1 fixed 1 variable gt 90dB s 24v 60 mA 2W max 2 1 mm female DC jack 2 LED 150 x 100 x 66 mm 6 x 4 x 2 1 2 610 g 1 3 Ib Creek Audio Ltd reserves the right to change or modify the specification of its products without prior warning Creek Audio Ltd Designed and made in the UK oe aa 12 Avebury Court Mark Road Hemel Hempstead HP2 7TA England Telephone 44 0 1442 260146 E mail info creekaudio com Fax 44 0 1442 243766 Web www creekaudio com A J Creek OBH 22 ri z Operating Instructions Thank you for purchasing the OBH 22 Infra red remote control passive Pre Amp You are now in possession of a State of the Art product The functions and operation of the OBH 22 are extremely simple However the following notes are provided to explain all aspects of its design and use ARC53 Remote Handset CEZ AUDIO LIMITED OVERVIEW The function of the OBH 22 is to provide input selection and volume adjustment to your Hi Fi system from your armchair via infra red remote control2. The unit consists of a high quality motorised volume potentiometer and two stereo relays which select the desired input and tape output together with a muting relay that can short the signals to ground A built in micro controller decodes the infra red signals transmitted by the handset and translates them into commands which activate the motorised potentiometer and the muting and input selection relays After each operation the micro controller turns itself off to avoid any possibility of interfering with the main music signal LED s are used to indicate the status and mode of operation The OBH 22 is purely passive and does not introduce any gain or distortion into the signal path It is therefore suitable to be used as a control Pre Amp provided the sensitivity of the power amp that is being used is high enough to be driven directly from the source i e CD or Tuner etc The volume control can be operated manually at any time whether the OBH 22 is powered or not but without power only Line 1 can be utilised MAINS CONNECTION When unpacking the module please rr the packing material in a safe place for possible future use In the pack there is a separate mains adaptor prepared for the mains voltage supply in the country of use The plug at the end of the fixed cable should be firmly inserted into the connector on the OBH 22 rear panel marked DC inlet Remember do not overload the mains wall socket with too many plu
3. ght above the button To un mute press the Mute button again or the volume up button volume down will not un mute the signal To un mute the OBH 22 without the handset remove the power supply for 10 secs To select the tape player or to monitor a tape recording press button Tape 1 The LED indicator will light Press button Tape 1 again to switch this off All other buttons on the handset are reserved for other Creek remote controlled products CAUTION Your OBH 22 amplifier is designed to give you years of reliable use However it is necessary to take care of your possession so never overheat and only use the recommended Creek OBH 1 power supply The OBH 22 is designed to comply with 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 transformers in other equipment Electrical switching noises from domestic or industrial heating systems conducted periodically down the mains supply can sometimes be amplified and present themselves as a click or a 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 se
4. gs or adaptors If in doubt please contact your supplying dealer or a qualified electrician The OBH 22 draws less than 2 Watts of power from the mains under all conditions so it can safely be left switched on without significantly increasing your electricity bill INPUT AND OUTPUT CONNECTIONS Line 1 and 2 are identical The output from a CD Tuner AV or from an OBH 15 or OBH 18 phono pre amp can be connected to either of them For tape machines use the Tape input and output the tape monitor function will allow recordings to be made and played back The output from the OBH 22 should be connected to a power amplifier with suitable sensitivity gain Remember the OBH 22 will not increase the signal from input to output VOLUME LEVEL The volume control 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 an amplifier is available only if the level of signal available from line level equipment is sufficient to drive it to clipping which will be different from one amplifier 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 t
5. hat the amplifier is having to work too hard or flat out Consult your dealer if 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 POSITIONING OF THE OBH 22 The OBH 22 needs to be powered from its adaptor to operate the volume input and mute functions via the remote control It will work best if placed on a suitable hard surface or Hi Fi equipment cabinet Should it be necessary to place the OBH 22 on the top of other audio or video equipment avoid obstructing any ventilation slots that could cause overheating or internal mains transformers which might induce hum pick up Very heavy signal interconnects may cause the OBH 22 to tip backwards There are two slots on the bottom that could be used to lock it in position Do not obstruct the IR sensor on the front panel OPERATING THE OBH 22 BY REMOTE CONTROL The OBH 22 has three line inputs including tape which can be selected either from the front panel buttons or remote handset The appropriate LED above each button will indicate which one is selected Volume level can be adjusted manually from the control knob on the front panel or by using the up and down buttons on the remote handset Remote volume changes will cause the input indicator LED to flash Pressing the Mute button on the front panel or remote handset will short the signal to ground and the LED indicator will li
6. rvice work carried out on the OBH 22 it should be returned to your dealer for his expert help in the original packing material if possible
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