16-18 System 3
HB7 Headphone Buffer
AC/DCSwitch
The AC/DC switch can be used to switch from DC coupling to AC coupling mode.
In AC coupling mode, a 0.5Hz high pass filter is applied to the signals.
DIFFSwitch
The DIFF switch will switch to a differential output mode that gives 6 dB of
additional gain when connected to a speaker. When DIFF is switched on (the switch
in the up position), the left channel input goes to both the left and right channels
and is inverted on the right channel (the right input BNC is not used). The
differential output will usually only be used with speakers, not headphones. To
connect the speaker, connect the left output to one pole of the speaker and the right
output to the other pole of the speaker (neither ground of the left nor right output
will be connected).
HB7TechnicalSpecifications
Input Signal Range
±10 V peak
Power Output
0.12 W into 4 Ohms, 0.25 W into 8 Ohms, 1.0 W into 32
Ohms
Spectral Variation
< 0.1 dB from 10 Hz to 200 kHz
Signal/Noise
117 dB (20 Hz to 80 kHz)
Noise Floor
9.2 V rms
THD
< 0.0002% (1 kHz tone, +/- 7V peak)
Corner Frequency
(AC-Coupled Mode)
0.5 Hz
Input Impedance
10 kOhm
Output Impedance
5 Ohm
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