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Violectric HPA V90, User Manual, Page: 14 / 24

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Violectric HPA V90 User Manual Download Page 14

 

14

 

 

VOLUME CONTROL 

The "VOLUME" control sets the desired output volumes for left and right 

channel simultaneously. 

  

THE AMPLIFIERS 

The input signals are fed to very special noiseless high-power integrated 

amplifiers which are capable to be operated with high supply voltage.  

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 characteristics 

within the audible range. Overall gain is set to +8 dB in order to provide 

sufficient reserves also for high-impedance headphones. 

 

THE HEADPHONE OUTPUTS 

The HPA V90 offers two stereophonic headphone outputs, each 

equipped with a 1/4" (6.3mm) jack socket. 

 

Headphone socket pinout: 

TIP Left 

channel 

RING Right 

channel 

SLEEVE GND 

 

 

Summary of Contents for HPA V90

Page 1: ...1 HEADPHONE AMPLIFIER HPA V90 USER s MANUAL ...

Page 2: ... Connection Connectors 9 General 10 Operation 11 Special Functions 15 Things to know 16 Disposal 20 Technical Data 21 Jumper Setting 22 Conformity Statement 23 Warranty 24 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: ...fted 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 hum or jitter caused by different ground earth potentials Of coarse full electrical protection is garanteed as the case is always connected to ground earth potential...

Page 8: ...t with jumpers not in the ex works position EMC emission might occur for which the user is responsible only Connection Connectors for Analog Signals ANALOGE SIGNALE zum Kopfhörer 6 3 mm TRS Klinkenstecker ip ing leeve T R S Tip linker Kanal Ring rechter Kanal Sleeve Masse SOURCE HOT HOT GND GND SHIELD SHIELD Unysmmetrischer Eingang oder Ausgang an unsymmetrisches Kabel UNBALANCED INCOMING SIGNAL U...

Page 9: ...LPS RK14 volume control High Quality op amps in the signal path High quality MKP capacitors in the signal path 1 metal film resistors throughout the unit 2 silver plated Neutrik headphone outputs Relay based headphone output cutoff Toroidal transformer Large filtering capacitors in the power supply Switchable ground lift Rugged aluminium case with Nextel coating Solid laser engraved aluminium fron...

Page 10: ...x POWER SUPPLY Mains power is provided via a three pin IEC CEE socket and mating cold appliance mains cord with Schuko type plug The device is set to 230V mains whereas the actual voltage may vary between 190 and 240 volts for flawless operation A toroidal transformer provides the internal operating voltages of 30V approx MAINS FUSE The 0 25A time lag fuse is soldered in place on the circuit board...

Page 11: ...ed outputs for the refreshed input signals which can so be used for further purposes The gold plated cinch outputs are marked as LEFT OUT and RIGHT OUT Output levels equal the levels applied to the inputs i e the signal is amplified by 0dB unity gain at an output impedance of 30 ohms Too loud Too soft The PRE GAIN method The V90 is specially designed to drive headphones Headphones however can pres...

Page 12: ...TO THIS PROBLEM PRE GAIN The alignment between amplifier and headphone is provided by the 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 ...

Page 13: ... 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 OPERATION Most control elements and indicators are located on the front panel POWER SWITCH The unit is put into operation by means of the power switch Power on status is indicated by the blue L...

Page 14: ...ign provides optimum crosstalk rejection The amplifier s frequency range stretches from DC to over 200kHz 3dB cutoff frequency in order to obtain absolutely linear characteristics within the audible range Overall gain is set to 8 dB in order to provide sufficient reserves also for high impedance headphones THE HEADPHONE OUTPUTS The HPA V90 offers two stereophonic headphone outputs each equipped wi...

Page 15: ...n of possible radio frequency interference Towards the low end your HPA V90 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 Therefore the HPA V90 offer...

Page 16: ...the most common design for operational amplifiers i e two amplifier circuits are integrated in one device If left and right channel signals are processed simultaneously by such a device interaction between both cannot be excluded This interaction is admittedly diminutive but should be avoided whenever a different design offers the possibility Why are op amps ideal for low level signal processing D...

Page 17: ...V whereas the headphone requires 20V to release 100dB of sound pressure With the volume control fully clockwise the V90 would provide 2 5V at 8dB gain only much to low for the headphone By means of PRE GAIN input level can be boosted by 12dB four times resulting in effective 4V These are again multiplied by 2 5 now equalling 10V This is still not enough but far closer to the optimum value The head...

Page 18: ...e able to protect themselves from overload Overall gain is set to 8dB factor 2 5 For high impedance headphones the power amplifier delivers one of the highest voltage swings available For low impedance headphones on the other hand there is power in abundance with a damping factor of 300 At the same time distortion and dynamic range represent the limits of the technically feasible Why makes it sens...

Page 19: ... nothing but the ratio between output impedance of an amplifier and a given load Since there is no known technical specifications we define the load voice coil impedance as 50 ohms This results in an output impedance of 0 17 ohms for the V90 The power supply with its supersized toroidal transformer provides the power stage with 30 volts The preamp stage is supplied with stabilized 18 volts Why are...

Page 20: ...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 otherwise be caused by inappropriate waste handling of this product The recycling of materials will help to conserve natural resources For more detailed information about recycling of ...

Page 21: ...equency Range 0 Hz 55 kHz 0 5 dB 0 Hz 200 kHz 3 dB Damping Factor 300 into a Load of 50 Ohms Dynamic Range 126 dB A wtd Noise 102 dBu A wtd THD N 1kHz 2x10V 100R 1W 108 dB 0 00035 THD N 1kHz 2x4V 32R 0 5W 102 dB 0 0007 Crosstalk 110 dB 1 kHz 90 dB 15 kHz Headphone Outputs 2 x 6 3 mm TRS Jack Max Ausgangspegel RL x 2 Ua dBu Ua V Pa mW 1kHz 0 1 THD N 600 28 6 20 9 730 100 25 9 15 2 2300 50 21 7 9 4 ...

Page 22: ...22 ...

Page 23: ...erification 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 Konstan...

Page 24: ...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...

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