Disposal - Violectric HPA V550 PRO User Manual

Why are high supply voltages essential?
A headphone doesn't really require high power, but from the equation P = U
square of the supply voltage determines the power into a given load resistance. The higher the
headphone's impedance, the more voltage will be needed to achieve high listening levels. But this
deals with the achievable loudness to a limited extent only: Technically spoken, music lives on fast
transients which put high demands on signal processing. And thus, a fast transient can easily push
an average amplifier with +/-15 volts supply to its limits (95 % of all headphone amps in the market
are operated with these or even lower supply voltages). Due to the high supply voltage and the
balanced operation mode of HPA V550 you will benefit from far over two times more output voltage
swing capability compared to single ended amps with "standard" supply voltage.
Why we are making our amps in such a way.
They are made with transistors and operated with +/- 25 V supply voltage because it is senseful to
do so. But a headphone amp must not be as powerful as a speaker amp.
Our "power" stage consists of eight transistors, four small ones, four bigger ones, all of them very
fast. They are driven by an op-amp in non-inverting mode, the gain is set to 0 dB. In balanced mode
the gain equals +6 dB as two power stages act in push-pull mode.
For high impedance headphones a very high output voltage of 21 V RMS is achieved - while low
impedance headphones will profit from a power over 6 Watt into 50 Ohms per channel.
Under all operating conditions noise, distortion and dynamic range is on the edges of physics.
Why does a output relay make sense when switching power?
Amplifiers generate unwanted output signals when applying or removing power, which can damage
the connected headphones. The relay breaks the connection between amplifier and headphone for
some seconds after power-on and thus protects the latter until electrical conditions have stabilized.

DISPOSAL

Disposal of Old Electrical & Electronic Equipment - WEEE Regulation
(Applicable in the European Union and other European countries with separate collection systems)
This symbol on the product or on its packaging indicates that this product shall not
be treated as household waste. Instead it shall be handed over to the applicable
collection point for the recycling of electrical and electronic equipment.
By ensuring this product is disposed of correctly, you will help prevent potential
negative consequences for the environment and human health, which could
otherwise be caused by inappropriate waste handling of this product.
The recycling of materials will help to conserve natural resources.
For more detailed information about recycling of this product, please contact your local Civic Office,
your household waste disposal service or the shop where you purchased the product.
24
2 / R we can see that the