Software; Things To Know - Violectric HPA V550 PRO User Manual

SOFTWARE

Altering the remote control
HPA V550 is delivered with the "Headphone Amp" remote.
It gives direct access to all front panel controls except the balance control and the power switch.
Alternative Mode:
Other remote control codes may be activated for a combined operation with additional
Violectric gear.
Pushing long (approx. 2 seconds) the "ANALOGUE INPUTS" button the "Remote Control Menu" is
entered, the "XLR" LED flashes.
The current state is displayed by the LEDs "RCA 1" and "RCA 2".
Pushing the "HEAD" or "LINE" buttons will alter this state. To finish the procedure, push the
"ANALOGUE INPUTS" button again for 2 seconds, the "XLR" LED stops flashing.
RCA 1 off
RCA 1 on
XLR
flashes RCA 1 off
RCA 1 on

Things to know ...

Why makes it sense to make such huge efforts?
A headphone amplifier is a device designed to condition audio signals with regard to the very
specific requirements of headphones. This does not 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: The K1000 requires 2500 times the power to achieve the
same sound pressure as the HD25.
There is also the fact that headphones with high impedance usually require much higher voltage to
achieve high loudness. Thus, the amplifier
RCA 2 off Remote control not active
RCA 2 off Remote control "HPA" active (ex works setting)
RCA 2 on Remote control "DAC" active (not supplied)
RCA 2 on Remote control "DAC" active in alternative Mode
must
be designed with high internal supply voltages.
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