Protective Measures; Things To Know - Violectric HPA V222 User Manual

PROTECTIVE MEASURES:

To ensure error-free operation and not to harm your valuable
headphones in a comprehensive way your VIOLECTRIC HPA V222 is
equipped with some protective circuits:
During powering on there is a five second delay to protect your
-
headphones from possibly unwholesome noises. After the time
the headphone outputs are switched to the amp.
Also, the instant cut-off after powering off is intended to protect
your headphones.
DC voltages are no good part of the output signal and must be
-
avoided. If such are detected, the headphone sockets are cut
from the electronics.
When the DC voltage has vanished, the amp will automatically
return to "normal" operation.

Things to know ...

Why makes it sense to make such huge efforts?
A headphone amplifier is a device designed to condition audio
signals with regards to the very specific requirements of
headphones. This doesn't sound too spectacular at the first glance
and can be achieved relatively easy. As with many things however,
the devil is in the details and much more effort is required to design
one amplifier for all current headphone models.
Headphones per se are quite diverse, and there are two essential
parameters: Impedance and Sensitivity.
In general, headphones with higher impedance can be regarded as
less sensitive than headphones with low impedance (which is not
generally true, but in the majority of cases). The sensitivity of
headphones is usually stated in dB SPL (sound pressure level) per
Milliwatt.
Extremes in this sense are the AKG K1000 with 74dB/mW on the one
hand, and the Sennheiser HD25 with108 dB/mW on the other hand:
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User´s Manual HPA V222, July 2022, F. Reim