Creek Audio Creek OBH-11 User's Manual
Contents
1. CREEK OBH 11 SPECIFICATION OUTPUT POWER gt 10 mW into 30 Q to 300 Q loads HEADPHONE IMPEDANCE 30 Q to 300 Q THD lt 0 05 at 1 kHz SIGNAL TO NOISE RATIO gt 70 dB POWER CONSUMPTION lt 4VA POWER SUPPLY 24V DC 150mA SIZE 100mm x 130mm x 65mm 4 x 5 x 2 5 WEIGHT NETT 360 gms _ 12 ozs Creek Audio Lid reserves the right to change or modify the specification of its products without prior warning Designed in the UK WARRANTY If within two years of purchase date your OBH 11 proves to be defective for any reason other than accident misuse neglect unauthorised modification or fair wear and tear Creek Audio Ltd will at its discretion replace the faulty parts without charge for labour or return carriage within the U K This warranty is valid only in the U K and given in addition to statutory rights Service enquiries outside the U K should be addressed first to the supplying dealer and or the Creek distributor importer Warranties granted in these countries are entirely at the discretion of the distributor Creek Audio Limited 12 Avebury Court Mark Road Hemel Hempstead HP2 7TA England Telephone 44 0 1442 260146 Fax 44 0 870 6220846 Email info creekaudio com Web www creekaudio com Creek OBH 11 OBH 11 Headphone Amplifier Operating Instructions Thank you for purchasing the OBH 11 Headphone Amplifier You are now in possession of a State of the Art product The functions and ope2. e OBH should be placed away from transformer hum fields for low noise operation Note 2 When new it is necessary for the OBH to be burned in for at least 24 hours before its full sound quality potential can be realised Note 3 Listening to excessive sound pressure levels can seriously damage your hearing Be careful and enjoy the music WIRING DIAGRAMS cD Player Option 1 OBH Power Supply Power Supply Option 2 Amplifier Amplifier Option 3 OBH Power Supply
3. power jack with centre positive pin for connection to a custom Creek OBH type power supply adaptor On the front panel there is one 1 4 6 3mm stereo socket for plugging in the headphones INSTALLATION AND OPERATION Connect the OBH power supply adaptor to the mains socket Find a suitable place for the OBH 11 and plug the DC power lead into the rear panel DC jack socket Connect a pair of high quality interconnect cables from the output of the source to the input sockets on the rear of the OBH 11 Refer to the wiring diagrams showing the different options for connecting the OBH 11 to your system Plug the headphones into the socket on the front panel Push the On Off button on the rear to power up the OBH 11 The small green LED on the front panel will light when it is ready for use The front panel volume control should be set to the desired signal level POWER SUPPLY REQUIREMENTS In common with all electrical appliances the OBH 11 needs a power source The requirements for the OBH 11 is 24 Volts DC at 150 milli Amps current A custom power supply has been provided to run it which must be connected to the unit via the DC inlet 2 1mm positive centre pin power jack on the rear panel The power supply adaptor should be plugged into the mains socket which should be matched for the voltage of the country of use N B Due to the circuitry charging up it is normal to hear a small thump through the headphones during switch on Note 1 Th
4. ration of the OBH 11 are extremely simple However the following notes are provided to explain all aspects of its design and use OVERVIEW The OBH 11 is a miniature audio amplifier designed specifically to drive a single pair of low to medium impedance 309 300Q headphones from a line level source It is more efficient to have a small amp to do this rather than waste the power of a full size one when only driving headphones The OBH 11 is compatible with any source at line level For example an average output level CD player can be connected directly to the input of the OBH 11 just as it could also be used in conjunction with a stand alone pre amplifier or integrated amplifier which doesn t have a headphone output The OBH 11 is not designed to be connected to the speaker output of an integrated or power amplifier Output level can be controlled by the high quality AUDIO LIMITED volume control on the front panel INPUT AND OUTPUT CONNECTIONS The OBH 11 has two pairs of stereo phono sockets RCA jacks on the rear panel The first pair is the Input from any line level source direct from the source or via the tape output of an amplifier The second pair of sockets marked Output are to chain link the signal onto the next component in the system Therefore the OBH 11 can be driven from the Tape Output of an amplifier and the second set of sockets can be used to link the signal to the Tape recorder input There is a 2 1mm DC
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