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Summary of Contents for Violectric HPA V281
- Page 1 HEADPHONE AMPLIFIER HPA V281 USERS MANUAL...
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Page 2: Table Of Contents
Content Theme Page About Violectric Safety Instructions The Earth / Grounding Concept Connection / Connectors General Block Circuitry Operation Things to know Disposal Technical Data Dismantling Jumper Setting Conformity Statement Warranty CAUTION !! THE HIGH OUTPUT LEVELS ACHIEVABLE WITH THIS UNIT MAY... -
Page 3: About Violectric
Cordial thanks for your decision in favour of a product ! is a trademark and product line of Lake People electronic GmbH. Lake People electronic GmbH develops, manufactures and distributes products in the professional range, for broadcast, television, airports, exhibition halls, festival venues, theatres, large-scale installations, private studios and more. - Page 4 's and Lake People's full technical support even when warranty has expired. Any technical questions or need for advice is welcome. is a subsidiary of LAKE PEOPLE electronic GmbH Turmstrasse 7a D-78467 Konstanz Fon +49 (0) 7531 73678 Fax +49 (0) 7531 74998 www.violectric.de www.violectric.com www.lake-people.de www.lake-people.com...
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Page 5: Safety Instructions
General Safety Instructions WARNING For your protection, please read the following: Water, Liquids, Moisture: This appliance should not be used near water or other sources of liquids. Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. - Page 6 Mains Fuse: The mains fuse of this appliance is soldered in place and accessible from the inside only!! A blown fuse may indicate an internal problem and should be replaced during qualified servicing or repair work !! Switchable Power Supply: Connect this unit to the power source indicated on the equipment rear panel only to ensure safe operation !! This unit is provided with an internally settable mains supply for 115 / 230 V AC.
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Page 7: The Earth / Grounding Concept
The Earth / Grounding Concept General GROUND-LIFT Jumper ( accessible from the inside. Mind the SECURITY INSTRUCTIONS !! ): Ex-works this jumper is set to the LIFT position. The internal ground potential is “lifted” by means of this jumper. As a result, the interconnection for DC voltages and lower frequencies (<... - Page 8 hum or jitter caused by different ground/earth potentials. Of coarse full electrical protection is granted as the case is always connected to ground/earth potential ! See page 32 "Technical Appendix" for details. Unfortunately there is no general recommendation how to solve hum and jitter problems - or even minimize them.
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Page 9: Connection / Connectors
Connection / Connectors for Analog Signals... -
Page 10: General
GENERAL INFORMATION The HPA V281 is a stereophonic headphone amplifier designed to drive low-, medium- and high-Z loads (16...600 ohms) as usually represented by high-quality headphones. Because of its 4 built in amplifiers and the 4-pin XLR socket on the front it is also suited to connect balanced headphones. -
Page 11: Operation
THE CASE The HPA V281's case as well as the front / rear panels are made of solid aluminium. This choice of material ensures high mechanical stability and resistance. EARTH AND GROUND The HPA V281's case is grounded. -
Page 12: Mains Fuse
MAINS FUSE The 0.25A time-lag fuse is soldered in place on the circuit board. In case, it must be replaced with a fuse of the same type only. CAUTION !! MIND THE SAFETY INSTRUCTIONS: A blown fuse indicates an internal fault and should be replaced during qualified repair or servicing only !! -
Page 14: Power Switch
POWER SWITCH The unit is put into operation by means of the power switch. Power-on status is indicated by the blue LED below. The power-on procedure takes about 5 seconds. During this time the LED of the last selected input is flashing and the outputs are muted. -
Page 15: Unbalanced Inputs
This value is reduced to +15/+9 dBu if PRE-GAIN is set to +6/+12 dB !! THE OPTIONAL DIGITAL INPUT Currently the HPA V281 can be fitted with one out of six D/A converter types, with three different inputs and a max. sample rates of 96 or 192... - Page 16 Volume of the host application should be set to 100%. INPUT SELECTION / ACTIVATION By means of the “XLR / RCA / DIG“ pushbuttons on the HPA V281’s front panel, either of the analog inputs or the digital input (if present) can be activated.
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Page 17: The Volume Control
THE VOLUME CONTROL The desired volumes for left and right channel are set simultaneously by means of the “VOLUME“ control. Volume can also be set via remote control. For this purpose, the volume control is actuated by a servo motor. Manual operation of the knob at the same time is possible without the risk of damage (although not useful…). - Page 18 "-6 dB" (half gain) or "-12 dB" (quarter gain) in upward direction. If you find your HPA V281 should provide more gain, do so with the switch labelled "+6 dB" (double gain) or "+12 dB" (quadruple gain).
- Page 19 UNBALANCED HEADPHONE OUTPUTS The HPA V281 offers two stereophonic headphone outputs, each equipped with a 1/4" (6.3mm) jack socket. Because HPA V281 offers 4 channel amplifier (2 x stereo), each socket is driven by a dedicated stereo amplifier Please note: the RIGHT...
- Page 20 On power-up and power-down, the outputs are cut from the amplifier circuitry by relay. THE BALANCED LINE OUTPUTS are located on the rear panel of the unit and are marked as “BAL OUT LEFT” and “BAL OUT RIGHT”. Gold-plated, metal-flange Neutrik XLR connectors are implemented here.
- Page 21 THE UNBALANCED LINE OUTPUTS are located on the rear panel of the unit and are marked as “UNBAL OUT LEFT” and “UNBAL OUT RIGHT”. Gold-plated premium RCA connectors are implemented here. ACTIVATING / DEACTIVATING THE LINE OUTPUTS The line outputs can be activated and deactivated by means of the “LINE“...
- Page 22 PLEASE NOTE: It is generally possible to use the unbalanced and balanced outputs simultaneously, but slight sound deterioration might occur depending on the following devices connected. In order to ensure optimal sound quality, only one output type should be made use of at a time. Switching between “Pre“...
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Page 23: Factory Reset
Muted status is indicated by the red “MUTE“ LED. The activated / de- activated status of the amp´s outputs however - as indicated by the green LEDs - remains unchanged ! ERROR EVALUATION In order to guarantee flawless operation and optimum protection of your valuable headphones, the V281 is equipped with various protection circuits: the delayed activation of the headphone outputs upon power-up... -
Page 24: Things To Know
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 doesn't sound too spectacular at the first glance and can be achieved relatively easily. - Page 25 Due to the large number of op-amps types offered, it is possible to pick an optimum type for any specific application. Why does PRE-GAIN make sense ? Two extreme examples (with the HPA V281 at +14 dB gain (x 4,5), volume control set to full): 1st example: The (pre-) amplifier provides 2V output voltage, whereas the headphone requires only 2V for 100 dB sound pressure level.
- Page 26 reduced by 12 dB (a fourth), with 0,5 V instead of 2 V input as the result. This 0,5 V is again amplified by 4.5, then equalling 2.25 V. Now the volume control can be turned over almost the entire range. 2nd example:: The (pre-) amplifier provides 1 V, whereas the headphone requires 20 V to release 120 dB of sound pressure.
- Page 27 Noble or Panasonic don't offer these any more. A current sample of top of the line pots is the RK27 by ALPS, which is also used in your HPA V281. Why is a low output impedance essential ? When actuated, electro-dynamic systems respond with a counterforce.
- Page 28 115 dB and THD+N at -103 dB, along with significantly improved analog output circuitry. Which USB devices can be connected to the HPA V281 ? Connections can be established to table-top or laptop PCs. MP3 players or similar gear cannot be connected.
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Page 29: Disposal
Why does 100% host volume setting make sense ? Volume control within the host is always accomplished digitally, i.e. bits are removed from the data stream. This may affect the signal quality because the resolution will become lower and the distortions may rise. In practise those effects will appear at such low levels which will not allow a valuation of the signal quality DISPOSAL... -
Page 30: Technical Data
TECHNICAL DATA HPA V281 All Measurements RMS unwtd., 20 Hz - 20 kHz, Pre-Gain set to 0 dB Inputs: 2 x XLR female, balanced, 2 x RCA, unbalanced 1 x digital (Option) Max.input voltage: + 21 dBu, Impedanz 10 kOhms... -
Page 31: Dismantling
Dismantling / Jumper Setings Please note: In the following, the internal settings of the HPA V281 are discussed. For changing these, a TORX T10 screwdriver or a 3mm Allen Key is required and you should by all means PULL THE MAINS PLUG !!! Only thereafter the settings can be altered without any hazard. -
Page 32: Jumper Setting
JUMPER SETTINGS HPA V281... - Page 33 JUMPER SETTINGS HPA V281...
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Page 34: Conformity Statement
CONFORMITY STATEMENT We herewith declare that the following unit Name: VIOLECTRIC HPA V281 Serial No. : -all - is in conformity with the following EC directives: 2006/95 EG Low voltage directive 2004/108 EG Electromagnetic compatibility EN 60065 Security directives for audio-,... -
Page 35: Warranty
WARRENTY Since 1986 we are constructing and manufacturing sophisticated electronics for ambitious customers. Since the early beginnings we are trying hard by accompanying measures, the use of 1st choice components and multiple quality checks during production to avoid faults at large. We are quiet effective in that and this is –... - Page 36 Additional gear from HEADPHONE AMPLFIERS: HPA V90 HPA V100 HPA V181 HPA V200 HPA V220 HPA V281 D/A CONVERTER: DAC V800 PHONO PRE-AMPLIFIER: PPA V600 LINE PRE-AMPLIFIER: PRE V630...
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