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Table of Contents
Related Manuals for Violectric HPA V181
Summary of Contents for Violectric HPA V181
- Page 1 HEADPHONE AMPLIFIER HPA V181 USER´s MANUAL...
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Page 2: Table Of Contents
Content Theme Page About Violectric Safety Instructions The Earth / Grounding Concept Connection / Connectors General Operation Things to know Dismantling / Jumper Settings Disposal Technical Data 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 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.
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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 V181 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 V181'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 V181'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 Cinch sockets as inputs: The cinch sockets are factory-preset as inputs and are equipped with integrated switch contacts ! When a cinch plug is inserted, it cuts possible signals applied to the balanced input automatically. I.e. the cinch input has priority. Input impedance for all inputs is 10 kohms.
- Page 14 The OPTO input is made according to the TOS-Link standard and is waiting for digital PCM audio data with a sample rate between 28 … 108 kHz. The USB type-B inputs on can be used to connect a host computer (desktop or laptop PC).
- Page 15 ONE step per channel at a time. If you find your HPA V181's volume could be somewhat softer (in order to improve volume control range e.g.), push the switch labelled "-6dB" (half gain) or "-12dB" (quarter gain) in upward direction.
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Page 16: Power Switch
If you find your HPA V181 should provide more gain, do so with the switch labelled "+6 dB" (double gain) or "+12 dB" (quadruple gain). Ex-factory, all switches are set to their lowest position - i.e. 0 dB or unity gain - which should be sufficient for most applications. - Page 17 (-) Left channel Pin 3 (+) Right channel Pin 4 (-) Right channel THE UNBALANCED HEADPHONE OUTPUTS The HPA V181 offers two stereophonic headphone outputs, each equipped with a 1/4" (6.3mm) jack socket. Unbalanced Headphone socket pinout: Left channel RING Right channel...
- Page 18 ALTERNATIVE BALANCED HEADPHONE CONNECTION The phone jacks sockets of HPA V181 may be configured by means of internal jumpers to provide balanced operation with two phone jack. To configure the the sockets please refer to page 29 technical Appendix".
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Page 19: Things To Know
Things to know … The HPA V181 offers balanced and unbalanced inputs. Which advantages do balanced signals offer ? In contrast to unbalanced signals, balanced signals are carried by two wires (plus ground/shield). In the transmitting device, a balanced signal is created by generating an inverted original signal (180ˆphase shifted). - Page 20 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 V181 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 21 Your HPA V181 may provide a USB input as an option. It has priority over all the other inputs and mutes these when a valid input signal is detected. Since the HPA V181 is a terminal device after USB regulations, it has a type-B interface.
- Page 22 The HPA V181 is DC-coupled, i.e. it can transduce DC voltage as well. For good measure, a low-cut filter can be inserted by setting the corresponding jumpers. After input buffering, the signals are forwarded to a simple 6dB-per-octave filter stage which can be set to two characteristics: AC (12 Hz), or DC (0 Hz).
- Page 23 The pot is followed by the power amplifier, which is made with special operational amplifiers which are famous for their power and their transmission speed. To enable balanced operation, each stereo channel is equipped with two amplifiers. These are operated at +/-18V supply voltage.
- Page 24 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 (sound pressure level) per milliwatt.
- Page 25 And thus a fast transient can easily push an average amplifier with +/-15 volts supply to its limits. Due to two amplifiers per stereo channel and the balanced “push-pull” operation, V181 offers double as high output voltage compared to normal unbalanced equipment.
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Page 26: Dismantling / Jumper Settings
5. assemble the unit in reverse order Frequency bandwidth limiting Your HPA V181's upper frequency limit is 200 kHz - the so-called "3-dB point" - at which signal level drops by 3dB. This limit is high enough to exclude any effect on the audible spectrum on the one hand, but low enough to provide sufficient rejection of possible radio-frequency interference. -
Page 27: Disposal
Towards the low end, your HPA V181's frequency response is not restricted at all. This means that even extremely low frequencies - right down to DC - will be amplified. "DC-coupling" as this technique is called, is not necessarily useful since neither DC nor very low frequencies are audible, but may damage your headphones on the other hand. - Page 28 JUMPER SETTING HPA V181...
- Page 29 ALTERNATIVE BALANCED HEADPHONE CONNECTION Both phone jacks sockets of HPA V181 situated left and right from the balanced connector are configured to match “normal” unbalanced jacks ex works. (see page 17) By means of internal jumpers these sockets may provide balanced operation with two phone jack.
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Page 30: Technical Data
TECHNICAL DATA HPA V181 All Measurements RMS unwtd., 20 Hz - 20 kHz, Pre-Gain set to 0 dB, Highpass active Inputs: 2 x XLR female, balanced, 2 x Cinch, unbalanced 1 x USB Style B (optional) Max. Input Voltage: + 21 dBu... -
Page 31: Conformity Statement
CONFORMITY STATEMENT We herewith declare that the following unit Name: VIOLECTRIC HPA V181 Serial No. : -alle - is in conformity with the following EC directives: 2006/95 EG Low voltage directive 2004/108 EG Electromagnetic compability EN 60065 : 2002 Security directives for audio-,... -
Page 32: 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 –...
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