Violectric HPA V550 How to use

Short Form Manual HPA V550 Dezember 2022 F. Reim S. 1
HEADPHONE AMPLIFIER
Violectric HPA V550
Short Form Manual

Short Form Manual HPA V550 Dezember 2022 F. Reim S. 2
POWER SUPPLY
Mains power is provided via a three-pin IEC/CEE socket and mating "cold-appliance" mains cord
with Schuko-type plug for units purchased in middle Europe.
The device is set to 230V mains, whereas the actual voltage may vary between 190 and 240 volts
for flawless operation.
The mains voltage may be altered to 115 V AC supply inside the unit with the aid of a mains
voltage selector. In this case stable operation is granted in a range of 85 to 120 V.
THE POWER SWITCH
The unit is put into operation by means of the "POWER“switch.
The power-on procedure takes about 5 seconds, during this time the
"PROTECT“LED is red. It will go off when all internal parameter are
checked and found ok.
Any unregular behavior will be displayed by the red "PROTECT“LED
which also causes all outputs to be muted.
Always the last setting of the input and output configuration is
recalled.
The Remote Control of VIOLECTRIC HPA V550
This remote control sends out infrared rays.
For that purpose there is a infrared LED on the front.
The remote control should point in direction of the target device to
obtain best functionality.
The operating distance is about 5 - 7 meters (15 –20 ft).
With the “VOLUME +“and “VOLUME -“buttons the volume can be
altered. This is done with a motor inside HPA V550 to get the
volume knob into motion.
With the “MUTE“button the internal mute function is engaged.
A direct “MUTE“can only be released by the remote control.
With the “INPUT + / - “buttons one of the three analogue inputs
may be selected.
With the “Head-Output“and “Line-Output“buttons you may
activate or deactivate the front mounted headphone outputs or the
rear mounted line output.
The “DIGI + / - “buttons and the upper six buttons
“OFF / UP / BEST“und “A / B / C“are without
any function for V550.

Short Form Manual HPA V550 Dezember 2022 F. Reim S. 3
THE ANALOGUE SIGNAL-INPUTS can be found on the back panel.
THE BALANCED INPUTS are marked with "XLR IN L" und "XLR IN R", featuring gold plated
connectors. With the aid of an adaptor also unbalanced sources may be connected.
THE UNBALANCED INPUTS are labelled as "RCA IN L 1/2" and "RCA IN R 1/2".
Gold plated connectors are used here.
The input impedance on all analogue inputs is 10 kohms.
The maximum input level shall not exceed +21 dBu.
PRE-GAIN –HEADPHONE AMP
Settings can be made for the left and right channel, they shall not be different from each other.
With these switches an additional gain or attenuation may be set. It is dependent on the output
level of the input source and the sensitivity of the headphones connected.
By this measure it is maintained to achieve lowest possible noise and maximum travel of the
volume attenuator. The high gain/attenuation range of about 36 dB (factor 64) ensures a perfect
match of any source with any headphone in the market.
SELECTING AN INPUT
With the "ANALOGUE INPUTS“button on the front panel one of three analogue inputs may be
selected and the appropriate LED is on.

Short Form Manual HPA V550 Dezember 2022 F. Reim S. 4
RESET OF THE PROCESSORS
The buttons and the complete inner control of HPA V550 are in need of processors.
If - of any reasons - nothing seems to work as it should anymore, follow these instructions to
come back to DEFAULT SETTINGS:
Push and hold the “ANALOGUE INPUTS”button whilst powering the unit. Soon after all LEDs
on the front panel will light up. Now you can release the “ANALOGUE INPUT”button as all
settings had been reset to default.
THE VOLUME ATTENUATOR
is to set the desired volume for
the left and right channel
simultaneously. Volume can
also be set via your remote
control. A motor will turn the
knob in this case.
BALANCE CONTROL
is provided to compensate
moderate level differences
between left and right channel
in a range of +/- 6 dB.
Only the right channel is
affected.
THE AMPLIFIER(S)
The input signals are fed to an amplifier stage especially designed for this application, with eight
transistors per channel. For balanced operation HPA V550 houses no less than four of those!
Channels are physically separated from each other to ensure optimum crosstalk rejection.
The frequency range covers 5 Hz ... 250 kHz (-0.5 dB) in order to ensure fully linear performance
within the entire audible range. Overall gain is set to 0 dB (unbalanced) or +6 dB respectively
(balanced) to ensure lowest self-generated noise.
ACTIVATING / DEACTIVATING THE HEADPHONE OUTPUTS
Pressing the "HEAD" button will activate/deactivate the headphone outputs on the front panel.
The white LED shows the activated state.

Short Form Manual HPA V550 Dezember 2022 F. Reim S. 5
THE BALANCED HEADPHONE OUTPUT
Because of its four amps HPA V550
features two real balanced outputs with
four-pin XLR socket and
4.4 mm Pentaconn.
THE UNBALANCED HEADPHONE
OUTPUTS
HPA V550 offers two “standard”outputs
with 6,3 mm (1/4”) TRS jack.
ACTIVATING / DEACTIVATING THE LINE OUTPUTS
Pressing the "LINE" button will activate/deactivate the rear line outputs.
The white LED shows the activated state.
THE LINE OUTPUTS
THE UNBALANCED LINE OUTPUTS are gold plated and marked as “RCA OUT L/R”.
THE BALANCED LINE OUTPUTS are gold plated and marked as “XLR OUT L/R”.
OUTPUT GAIN SETTINGS
The level of the activated input will appear unaltered at the line outputs. This level may be
adapted by the "LINE OUT GAIN" switches in order to perfectly match the subsequent equipment.
SIGNAL SWITCH: PRE - POST FADER or FIXED - VARIABLE
The line out signal may be sourced from two different positions inside HPA V550.
If you want to use the activated input signal as is, maybe to source a unit with its own attenuator
or a recording device, than the “PRE-FADER”or “FIXED OUT”mode is the right choice.
If you like to operate you HPA V550 as a pre-amp device of outstanding quality to drive some
active speakers or power amps, than switch to “POST-FADER”or “VARIABLE OUT”.

Short Form Manual HPA V550 Dezember 2022 F. Reim S. 6
TECHNICAL DATA VIOLECTRIC HPA V550
All values RMS unwtd., 20 Hz - 20 kHz, Pre-Gain set to 0 dB
Input Parameter Analogue
Inputs (stereo, analogue): 1 x XLR female, balanced,
2 x RCA, unbalanced
Max. Input Voltage: + 21 dBu
Input Impedance: 10 kohm
Line Out Parameter
Line Outputs (stereo, analog): 1 x XLR male, balanced
1 x RCA unbalanced
Line-Out Gain: -18 / -12 / -6 / 0 / +6 / +12 / +18 dBr
Max. Output Voltage: + 21 dBu
Output Impedance: < 1 Ohm
Headphone Amp Parameter
Nominal Input Sensitivity: +6 dBu
Amplifier Gain: 0 dB unbal. / +6 dB bal.
PRE-GAIN: -18 / -12 / -6 / 0 / +6 / +12 / +18 dBr
Frequency Range: 5 Hz ... 250 kHz (- 0,5 dB)
Balance: +/- 6 dB, only effective in the right channel
Output Impedance: 0,15 Ohm unbal. / 0,3 Ohm bal.
Damping Factor (Load 50 Ohm): 320 unbal. / 160 bal.
Dynamic Range: > 131 dB (A-wtd)
Noise: < -103 dBu (A-wtd)
THD+N (1kHz/2x10V/100R = 1W): < -102 dB / < 0,0008 %
THD+N (1kHz/2x4V/32R = 0,5W): < -100 dB / < 0.001 %
Crosstalk: -105 dB (1 kHz) / -100 dB (15 kHz)
Headphone Outputs: 1 x 4-pol XLR,
1 x 4.4 mm Pentaconn
1 x ¼“(6.3 mm) TRS Phone Jack
Max. Output Level RLUa(dBu) Ua (V) Pa(mW)
600 28,7 21,1 740
Conditions: 300 28,6 20,9 1450
Balanced Operation 100 28,5 20,7 4300
Both channels driven 50 27,3 17,9 6400
(1kHz / < 0.1% THD+N) 32 24,0 12,3 4700
16 17,3 5,7 2000
8 12,3 3,2 1300
4 6,8 1,7 700
Mains Supply: 230 V AC / 115 V AC max. 50 VA
Front, Back: 8 mm / 3 mm Aluminum, black anodized
Case: 3 mm / 4 mm Aluminum, black anodized
Case Dimensions: 290 x 80 x 254 mm / 11,4”x 3,15”x 10”(W x H x D)
Overall Dimensions: 290 x 90 x 282 mm / 11,4”x 3,5”x 11,1“(W x H x D)