INPUT AND OUTPUT CONNECTION

The OBH 21/21SE is not designed to be connected to the high level speaker output of an integrated or power amplifier. Output level is controlled by the high quality volume control on the front panel.

The OBH 21/21SE 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 on to the next component in the system. Therefore the OBH 21/21SE 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.

POWER SUPPLY REQUIREMENTS

In common with all electrical appliances, the OBH 21/21SE requires a power supply.

The requirement for the OBH 21/21SE is for 24 Volts DC at

150mA. A custom Creek power supply (Creek-Uni) has been provided and this must be connected via the DC inlet on the rear panel of the OBH 21/21SE.

The power supply which has been provided is a switchable supply with a universal input range of 100 – 240 Volts. The Creek-Uni power supply is supplied with a pack of universal plug fittings to adapt for Europe, U.K. and the Far East, USA and Australia. Choose the correct fitting for your country of use and simply snap in place.

NOTE

Due to the circuitry charging up it is normal to hear a small thump through the headphones during switch-on.

It is necessary for the OBH 21/21SE to be ‘burned in’ for at least 24 hours before its full sound quality potential can be realised.The on/off switch is located on the rear panel. As the OBH 21/21SE draws very little power it may be left switched on permanently.

INSTALLATION AND OPERATION

Connect the Creek Uni power supply adaptor to the mains socket. Find a suitable place for the OBH 21/21SE 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 21/21SE.

There are several wiring options.

OPTION A

Connect directly from the output of a CD player to the input of the headphone amplifier

OPTION B

Connect the output of the CD player to the input of the headphone amplifier (as in Option A) Then connect the output of the headphone amplifier to the input of a stereo amplifier.

OPTION C

Connect the output of a CD player to the input of a stereo amplifier. Connect the output of the stereo amplifier to the input of the headphone amplifier (as in Option B). Then connect the output of a tape deck to the input of the stereo amplifier and the output of the headphone amplifier to the input of the tape deck.

Plug the headphones into the socket on the front panel. If you are using the OBH 21/21SE with two pairs of headphones, the output from each socket will be identical. However, if you are using only one pair of headphones, the impedance on each socket will be different. This feature is designed to give a better match with your particular headphones.

Try each socket to determine the best results.

Push the On/Off button on the rear panel to power up the headphone amplifier. the small green LED on the front panel will light when it is ready for use.

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Creek Audio OBH 21 dimensions Input and Output Connection, Power Supply Requirements, Installation and Operation
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OBH 21 specifications

The Creek Audio OBH 21 is a high-performance headphone amplifier that has garnered a reputation for delivering exceptional sound quality in a compact and understated design. Designed by Creek Audio, a company known for its commitment to high-quality audio products, the OBH 21 is aimed at audio enthusiasts who seek an enhanced listening experience without compromising on space or budget.

One of the main features of the OBH 21 is its robust build quality. Constructed in a sleek, minimalist chassis, the amplifier exudes a sense of elegance and sophistication. Its user-friendly interface includes a large, centrally positioned volume control knob and a headphone output, which provides easy access for users. The unit is designed to accommodate a wide range of headphone types, from demanding high-impedance models to more conventional options, making it versatile enough for various listening preferences.

A standout technology incorporated into the OBH 21 is its advanced Class A circuitry. This design allows for a pure audio signal to be transmitted with minimal distortion, resulting in a clean and expansive soundstage. The Class A operation ensures that the amplifier maintains excellent linearity throughout the audio spectrum, contributing to rich, detailed sound reproduction.

Another important characteristic of the OBH 21 is its excellent gain structure. The amplifier features a high-quality input stage that can effectively handle different source types, whether connecting to a CD player, smartphone, or DAC. The result is a seamless and enjoyable listening experience, as the amplifier brings out the subtleties in various audio recordings.

The connectivity options of the OBH 21 include both RCA input and output, allowing the unit to easily integrate with existing audio systems. Its weight and size make it a perfect fit for compact spaces, such as small home offices or desktop environments.

Overall, the Creek Audio OBH 21 stands out as an exceptional headphone amplifier that brings high-fidelity audio to users with its premium construction, superior sound technology, and versatile compatibility. For those in search of a reliable and sophisticated audio enhancement solution, the OBH 21 proves to be an ideal choice, combining quality and practicality in one elegant package.
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