Table of Contents
Advertisement
Advertisement
Table of Contents
Related Manuals for Violectric HPA V280
Summary of Contents for Violectric HPA V280
- Page 1 HEADPHONE AMPLIFIER HPA V280 USER´s MANUAL...
-
Page 2: Table Of Contents
Content Theme Page About Violectric Safety Instructions The Earth / Grounding Concept Connection / Connectors General Operation About balanced headphone amps Things to know Disposal Dismantling Jumper Settings Technical Data Conformity Statement Warranty CAUTION !! THE HIGH OUTPUT LEVELS ACHIEVABLE... -
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 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 Mail: info@lake-people.de www.violectric.de www.violectric.com www.lake-people.de www.lake-people.com...
-
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.
-
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 Unfortunately there is no general recommendation how to solve hum and jitter problems - or even minimize them. The best way to succeed is to check different options !! In case of balanced cables, it should always been verified if the shield of the cable is connected to the shell of the XLR connector.
-
Page 9: Connection / Connectors
Connection / Connectors for Analog and Digital Signals... -
Page 10: General
Large filtering capacitors in the power supply Switchable ground lift Rugged aluminium case with Nextel coating Solid, laser-engraved aluminium front panel The HPA V280 is equipped with internal filters to prevent damage to the connected headphones due to high-frequency overload beyond the audible range. -
Page 11: Operation
THE CASE The HPA V280's case as well as the front or rear panels are made of solid aluminium. This choice of material ensures high mechanical stability and resistance. EARTH AND GROUND The HPA V280's case is grounded. Internal reference ground is bridged to protective earth by means of a jumper. -
Page 12: Unbalanced Inputs
BALANCED SIGNAL INPUTS The balanced signal inputs are situated on the rear panel of the unit and are labelled as "BAL IN LEFT" and "BAL IN RIGHT". They are fitted with XLR sockets. Please note: Unbalanced signals can be injected as well by means of an adaptor. Also see page 9. - Page 13 See also page 25 "Technical Appendix" THE OPTIONAL DIGITAL INPUT Currently the HPA V280 can be fitted with one out of seven D/A converter types, with three different inputs and a max. sample rate of 96 or 192 kHz: The COAX input accepts digital PCM audio data in S/P-DIF format, at sample rates from 28 to 108 kHz (or 210 kHz resp.).
- Page 14 By now we recommend the “Tenor” chip-set for Windows applicatons and the “X-Mos” chip-set for Mac users. The 192 kHz modules are equipped with a top-notch converter offering a 115 dB dynamic range and –103 dB THD+N, along with significantly improved analog output circuitry.
-
Page 15: Power Switch
"-6dB" (half gain) or "-12dB" (quarter gain) in upward direction. If you find your HPA V280 should provide more gain, do so with the switch labelled "+6 dB" (double gain) or "+12 dB" (quadruple gain). - Page 16 The amp circuitry is derived from the famous Violectric V200 ! The individual-channel design provides optimum crosstalk rejection. The amplifier's frequency range stretches from DC to over 200kHz (-3dB cutoff frequency) in order to obtain absolutely linear character- istics within the audible range.
-
Page 17: About Balanced Headphone Amps
Please note: The RIGHT phone jack is connected to the in-phase stereo signal, whereas the left phone jack is connected to the 180 phase shifted signal. On power-up and power-down, the outputs are cut from the amplifier circuitry by relay. HINTS FOR THE BALANCED OPERATION OF HEADPHONES As there is no common standard about how to make the connectors of... - Page 18 Electronically balanced signals can be made with two op-amps. Here, out of a present unbalanced signal (a) an inverted or 180 phase shifted signal (-a) is formed with another op-amp. Both signals are fed to a cable consisting of a twisted pair which must not necessarily be shielded.
- Page 19 “Balanced” amps. Let´s take a look at a simple amp: The left and right input signals are amplified and are fed to the left and right load. “Balanced” amps are not new at all but known for a long time e. g. in car radios where this technique is taken to achieve quad...
- Page 20 The input signals are fed to the loads via two amplifiers per load. The trick is, that one of these amplifiers is working “normal”, the other inverted respectively phase shifted. While one amp is “pushing”, the other amp is “pulling”. In doing so the output amplitude is doubled and the power is fourfold compared to a “normal”...
- Page 21 · The lower the output impedance of an amp, the lower its influence on the transmission quality · Using “normal” headphones with phone jacks will lead to relatively big faults caused by the common ground cable and the less than perfect connectivity from phone jack to phone socket because of much too big contact surfaces.
- Page 22 Especial when there are only low impedance headphones to drive. There is more than one amp in the Lake People / Violectric program range with more than enough amplitude – even for high impedance loads. So, what is the sense of a balanced headphone amplifier ? As mentioned earlier a “simple”...
- Page 23 But also the use of 2 x 3-pin XLR connectors seems to be nor very rational. We from Lake People / Violectric voted for a 4-pin female connector as the output socket.
-
Page 24: Things To Know
With a pin-out which is kind of common since the days of good old AKG K1000. Not according to the general XLR standard but also common is that the female connector is attached to the devices while the male connector is attached to the headphone cable. - Page 25 in the majority of cases). The sensitivity of headphones is usually stated in dB (sound pressure level) per Milliwatt. Extremes in this sense are the AKG K1000 with 74dB/mW on the one hand, and the Sennheiser HD25 with 108 dB/mW on the other hand: The K1000 requires 2500 times the power to achieve the same sound pressure as the HD25.
- Page 26 Why does PRE-GAIN make sense ? Two extreme examples (with the HPA V280 at 8dB gain, volume control set to full cw): 1st example: The (pre-)amplifier provides 4V output voltage, whereas the headphone requires only 2V for 100dB sound pressure level.
- Page 27 Since the market for really good pots is a small one, manufacturers like 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 V280. Why is a low output impedance essential ? When actuated, electro-dynamic systems respond with a counterforce.
- Page 28 Some words about the different digital input options. Currently the HPA V280 can be fitted with one out of seven D/A converter types, with three different inputs and a max. sample rate of 96 or 192 kHz: The COAX input accepts digital PCM audio data in S/P-DIF format, at sample rates from 28 to 108 kHz (or 210 kHz resp.).
-
Page 29: Disposal
Which USB devices can be connected to the HPA V280 ? Connections can be established to table-top or laptop PCs. MP3 players or similar gear cannot be connected. Why does 95-100% host volume setting make sense ? Volume control within the host is always accomplished digitally, i.e. bits are removed from the data stream. -
Page 30: Dismantling
DISMANTLING / JUMPER SETTINGs Hint: Here we are talking about internal adjustments inside your HPA V280. You are in need of two screw drivers TORX style size T8 and T10. You should by all means PULL THE MAINS PLUG !!! Only thereafter the settings can be altered without any hazard. - Page 31 JUMPER SETTING HPA V280...
-
Page 32: Technical Data
TECHNICAL DATA HPA V280 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, Input impedance: 10 kohms... -
Page 33: Conformity Statement
CONFORMITY STATEMENT We herewith declare that the following unit Name: VIOLECTRIC HPA V280 Serial No. : -all - is in conformity with the following EC directives: 2006/95/EG Low voltage directive 20014/30/EC EMC directive EN 60065:2002+A12:2011 Security directives for audio-, JIS C6065:2013... -
Page 34: 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 –...
Need help?
Do you have a question about the HPA V280 and is the answer not in the manual?
Questions and answers