Creek headphone amplifiers eliminate the use of a full size amplifier
for boosting the power when only headphones are used. An average output
level CD player or tuner can be connected directly to the input of the
headphone amplifier.
The OBH-21 & OBH-21SE incorporate advanced circuitry utilising
professional standard operational amplifiers. The discrete transistor
technology used in the earlier model OBH-11 has been replaced by
high-grade integrated circuits providing a capability to drive different
types and impedances of headphones without problem.
There are two 6.3mm (1/4“) stereo headphone jacks on the front panel of
both models. The output level is regulated by the volume control on the
front panel. When using the OBH-21 one source can be amplified as the
headphone amplifier has only one stereo input. It has stereo phono
sockets (RCA jacks) on the rear panel for input from any line level
source, together with a DC power jack. In common with all electrical
appliances, the OBH-21 requires a power source. A custom power supply is
provided, 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 may
vary depending on country of use.
Internally advanced circuitry is used to split the power supply from a
single positive to a split positive/negative supply, which allows
circuits to be DC coupled and to eliminate capacitors on the SE version.
The SE version uses higher-grade components throughout. It also features
two pairs of stereo Phono sockets (RCA jacks) on the rear panel for
input from any line level source and chain linking to another product in
a tape loop circuit. The DC power jack for connection to a custom OBH
high-grade power supply adaptor is also located on the rear panel.
The OBH-21 can also be used in conjunction with other Creek OBH series
products, such as Phono pre-amplifiers or the OBH 22passive
pre-amplifier. Furthermore, it also functions with a stand-alone
pre-amplifier or integrated amplifier without headphone output,
connected in the tape loop.
The OBH-21 miniature audio amplifier is the ideal way to enjoy your
favourite music in privacy.
SPECIFICATIONS
| |
OBH 21 |
OBH 21SE |
|
Output power
|
> 10 mW into 30
W
to 300
W
loads |
> 10 mW into 30
W
to 300
W
loads |
|
Headphone Impedance
|
30
W
to 300
W |
30
W
to 300
W |
|
Total Harmonic Distortion |
< 0.01% at 1 kHz
|
<
0.005% at 1 kHz
|
|
Signal to noise ratio
|
> 70 dB |
> 70 dB |
|
Power consumption |
< 4 VA |
< 6 VA
|
|
Power supply requirement |
24V DC, 150mA,
centre positive
24V DC, 150mA
|
24V DC, 150mA,
centre positive
24V DC, 150mA
|
|
Preferred Power supply
|
OBH-1 (un-regulated) |
OBH-2 (regulated)
|
|
Size (W x D x H) mm |
100 x 180 x 65 As
per OBH-21 |
100 x 180 x 65 As
per OBH-21 |
|
Weight (Nett) |
360 g |
360 g |
