Violectric HPA V281 User Manual Download | Manualshive

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7

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
(< 150 Hz) will be cut. Higher frequencies will be bled off to earth
potential through the RC filter. The LIFT position is helpful in case of

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Summary of Contents for HPA V281

Page 1: ...1 HEADPHONE AMPLIFIER HPA V281 USERS MANUAL ...

Page 2: ...tion Connectors 9 General 10 Block Circuitry 13 Operation 11 Things to know 24 Disposal 29 Technical Data 30 Dismantling 31 Jumper Setting 32 Conformity Statement 34 Warranty 35 CAUTION THE HIGH OUTPUT LEVELS ACHIEVABLE WITH THIS UNIT MAY DAMAGE YOUR HEARING OR THE HEADPHONES IF OPERATED CARELESSLY ...

Page 3: ...High End market with its specific requirements Who develops equipment devices are exclusively developed in Germany by the engineers of Lake People electronic GmbH In doing so the team of developers can draw on twenty years of experience and countless products for the pro audio domain Among others the first German made 20 bit A D and D A converters were developed by Lake People in the early ninetie...

Page 4: ...it should devices are covered by a 24 month warranty In case of any malfunction during this period they can be shipped to the manufacturer directly Of course the client will benefit from 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...

Page 5: ...tion to cords at plugs convenience receptacles and the point where they exit from the appliance This unit is equipped with a 3 pole mains cable with German 3 pin mains plug In some countries this unit must be operated with a mains adaptor supplied by the owner Please refer to the table below to connect a mains plug OVERVIEW POWER CORD FUNCTION AND COLORS CONDUCTOR COLOR Alternativ L LIVE BROWN BLA...

Page 6: ...ser should not attempt to service the appliance beyond the measures described in the operating manual All other servicing or repair should be referred to qualified personnel Electromagnetic Compatibility This unit conforms to the Product Specifications noted as Declaration of Conformity at the end of this manual Operation is subject to the following conditions this device may not cause harmful int...

Page 7: ...x 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 150 Hz will be cut Higher frequencies will be bled off to earth potential through the RC filter The LIFT position is helpful in case of ...

Page 8: ...modified Electrical safety is always ensured since the earth conductor is permanently connected to the enclosure XLR GROUD LIFT Jumper accessible from the inside Mind the SECURITY INSTRUCTIONS G ROUND Ex works all jumpers are set to G ground position Pin 1 is connected to the internal ground reference High frequency interference is deflected to the case via a 100 nF capacitor L IFT The interconnec...

Page 9: ...9 Connection Connectors for Analog Signals ...

Page 10: ...hable input gain in five steps Balanced and unbalanced line outputs with RCA resp XLR sockets gold plated pre post fader assignable Independent channel design ALPS RK27 High Grade volume control Remote controlled and motorized volume control input output selection mute as an option High Quality op amps in the signal path High quality MKP capacitors in the signal path 0 1 and 1 metal film resistors...

Page 11: ...ound is set to LIFT position ex works but may be reconfigured to GROUND position if required see also page 7 Earth Ground concept page 32 Technical Appendix 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...

Page 12: ...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 13: ...13 ...

Page 14: ...hing and the outputs are muted Always the last setting is recalled 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 gold plated XLR sockets with metal flange from Neutrik Please note Unbalanced signals can be injected as well by means of an adaptor Also see page 9 Balanced XLR Pin out ...

Page 15: ...z resp The USB type B input can be connected to a host computer PC or laptop The USB module will automatically be detected as an audio device The USB 96 input is compatible with USB 1 1 and 2 0 standards It accepts digital audio formats up to 24 bit at sample rates of 44 1 48 and 96 kHz while 88 2 kHz is not supported The USB 192 input is compatible with the USB 2 0 standard It requires a propriet...

Page 16: ... either of the analog inputs or the digital input if present can be activated The LED next to the corresponding button will light up accordingly Inputs can also be switched by means of the remote control press 1 on the remote control to select the XLR input press 2 on the remote control to select the RCA input press 3 on the remote control to select the DIG input Alternatively the channel up down ...

Page 17: ...t and right headphone system or differences in the user s individual hearing All of the above can be carefully compensated The balance control offers a precise center detent in case no adjustment is necessary In order not to impair the V281 s perfect crosstalk specs it takes effect on the right channel only THE AMPLIFIER The input signals are fed to an amplifier stage especially designed for this ...

Page 18: ...e preamp stage which can boost or attenuate the input signal in four steps of 6dB each For this purpose two switching devices are located on the rear panel for left and right channel individually CAUTION The switch settings should be altered under the following conditions only The unit must be switched OFF the VOLUME control must be set to minimum left and right channel settings should ALWAYS be s...

Page 19: ...LR connector 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 phone jack is connected to the in phase stereo signal whereas the left phone jack is connected to the 1800 phase shifted signal B...

Page 20: ...plated metal flange Neutrik XLR connectors are implemented here Hint With a balanced to unbalanced adapter this connection may also be used for unbalanced cables PLEASE NOTE THAT IN THIS CASE PIN 3 HAS TO BE LEFT OPEN See also page 9 for details Balanced interconnection of the XLR socket Unbalanced interconnection of the XLR socket PIN 1 GND PIN 1 GND PIN 2 in PHASE PIN 2 Signal PIN 3 out of PHASE...

Page 21: ...rent points within the V281 s signal path If you wish to make use of the input signal without any level change for a device with its own level controls or recording purposes e g the Fixed Out or Pre Fader path prior to level control is the right choice In this case the unaltered INPUT signal prior to level control is forwarded to the line output If you want to feed a power amplifier or active loud...

Page 22: ...ow by pressing the corresponding button To complete the setting procedure just press and hold the LINE button again until the green LED stops flashing LINE OUTPUT LEVEL can be set by means of internal DIP switches located on the line out circuit board See page 33 for further details Generally the level at the unbalanced output will equal the input level in pre fader mode or with the level control ...

Page 23: ...tage should be kept from your headphones at all times If DC is detected the headphone outputs will be disconnected indicated by the red MUTE LED flashing and the green HEAD LED lit The detection interval is about five seconds If DC disappears during this period the unit will resume normal operation automatically Overloading i e increased distortion must be avoided in favour of your headphones as w...

Page 24: ...with 74dB mW on the one hand and the Sennheiser HD25 with108 dB mW on the other hand The K1000 requires 2500 times the power to achieve the same sound pressure as the HD25 There is also the fact that headphones with high impedance usually require much higher voltage to achieve high loudness Thus the amplifier must be designed with high internal supply voltages Which advantages do balanced signals ...

Page 25: ... the partially exorbitant extra expenses are of course to be paid by the customer But an op amp consists of transistors as well Moreover its structure has the advantage of thermal coupling between its internal components Also ageing issues play a much less important role Due to the large number of op amps types offered it is possible to pick an optimum type for any specific application Why does PR...

Page 26: ... people from about 20 to 20000 Hz The elder the listener the less he will hear high frequencies in particular In order to transmit these frequencies at optimum quality the frequency response of an amplifier should be as wide and as flat as possible At the low end of the scale this limit is represented by DC as there is no frequency lower than zero In upward direction the limit can be set to practi...

Page 27: ...impedance of an amplifier and a given load Since there is no known technical specification we define the load voice coil impedance as 50 ohms With V281 having an output impedance of 0 2 ohms in balanced mode and 0 1 ohms in unbalanced mode this results in a damping factor of 250 balanced and damping factor of 500 unbalanced Why are high supply voltages essential A headphone doesn t really require ...

Page 28: ... 2 kHz The USB 96 input is compatible to the USB 1 1 and 2 0 standard All the above modules own a D A converter which we would judge to be upper middle class with a dynamic range of 110 dB and THD N at 100 dB Coax Opto 192 accept sample rates up to 210 kHz the USB 192 accepts 44 1 48 88 2 96 176 4 and 192 kHz and supports the so called asynchronous mode The USB 192 input is compatible with the USB...

Page 29: ...ystems 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 o...

Page 30: ...Hz 200 kHz 3 dB Output impedance 0 1 Ohm unbal 0 2 Ohm bal Damping factor Load 50 Ohm 500 unbal 250 bal Dynamic range 129 dB A wtd Noise 95 dBu A wtd THD N 1kHz 2x10V 100R 1W 102 dB 0 00079 THD N 1kHz 2x4V 32R 0 5W 100 dB 0 001 Crosstalk 105 dB 1 kHz 103 dB 15 kHz Headphone outputs 1 x 4 pol XLR 2 x 6 3 mm Phone Jack Max output level RL x 2 Ua dBu Ua V Pa mW 1kHz 0 1 THD N 600 34 3 40 2 2700 Balan...

Page 31: ...settings can be altered without any hazard Dismantling 1 screw off both upper screws on the front panel 2 screw off both upper screws on the back panel 3 unscrew both lower screws on the front panel by a few turns in order to tilt the front panel a bit 4 now lift the upper lid 5 make your personal jumper settings 6 reassemble the unit in reverse order To modify the Ground Lift setting on the main ...

Page 32: ...32 JUMPER SETTINGS HPA V281 ...

Page 33: ...33 JUMPER SETTINGS HPA V281 ...

Page 34: ...verification of conformity with regard to electromagnetic compatibility the following harmonized standards are applied EN 50081 1 1992 Generic emission standard EN 50082 1 1992 Generic immunity standard Product family standard for audio video audio visual entertainment apparatus EN 55013 2001 EN 61000 3 2 2000 EN 55020 2002 EN 61000 3 3 1995 This declaration is given under responsibility of Konsta...

Page 35: ...iration of the warranty If it is necessary please dispatch your item to Lake People electronic GmbH Fon 49 0 7531 73678 Turmstrasse 7a Fax 49 0 7531 74998 D 78467 Konstanz E Mail info lake people de Your warranty claim begins with the date of purchase which should be denoted on your proof of purchase Do not forget to include the receipt of sales or a copy of the receipt Please also include a short...

Page 36: ...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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