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Summary of Contents for Violectric DHA V5902
- Page 1 HEADPHONE AMPLIFIER with D/A Converter Violectric DHA V590 / V590 USER´s MANUAL DHA V5902 (Standard) = Volume Control with Alps RK 27 motorized Attenuator DHA V590 PRO = Volume Control in 256 Steps each 0,4 dB with Reed-Relays Manual DHA V590 March 2022 F.
- Page 2 P. 2 Manual DHA V590 March 2022 F. Reim...
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Page 3: Table Of Contents
Content Theme Page About Safety Instructions The Earth / Grounding Concept Connection / Connectors General Remote Control Block Circuitry Operation About PRE-GAIN Reset Software Filter curves Things to know Disposal Technical Data Dismantling Jumper Settings Conformity Statement Warranty CAUTION!! THE HIGH OUTPUT LEVELS ACHIEVABLE WITH THIS UNIT MAY DAMAGE YOUR HEARING OR THE HEADPHONES IF OPERATED CARELESSLY!! - Page 4 Any technical questions or need for advice is welcome. is a subsidiary of www.lake-people.de LAKE PEOPLE electronic GmbH www.lake-people.com Turmstrasse 7a www.NIIMBUS-audio.de D-78467 Konstanz www.NIIMBUS-audio.com www.violectric.de Fon +49 (0) 7531 73678 www.violectric.com Fax +49 (0) 7531 74998 P. 4 Manual DHA V590 March 2022 F. Reim...
- Page 5 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 Service / Repair: To reduce the risk of fire or electric shock, the user 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! VOR DEM ÖFFNEN NETZSTECKER ZIEHEN!! PULL MAINS BEFORE OPENING!! AVANT D´OUVRIER...
- Page 7 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.
- Page 8 Connection / Connectors for Analogue Signals P. 8 Manual DHA V590 March 2022 F. Reim...
- Page 9 Connection / Connectors for Digita Signals Manual DHA V590 March 2022 F. Reim P. 9...
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Page 10: General Information
GENERAL INFORMATION VIOLECTRIC DHA V590 contains an excellent D/A Converter, a first-class Preamplifier and a high- grade stereo balanced Headphone Amplifier designed to drive low-, medium- and high-Z loads (16...600 ohms) as usually represented by high-quality headphones. Because of its four built-in amplifiers and the front mounted 4-pin XLR and the 4.4 mm Pentaconn sockets it is a real balanced amplifier and the balanced output sockets are not only a convenience feature. -
Page 11: Mains Fuse
With its dimensions, the VIOLECTRIC DHA V590 ensures optimum flexibility combined with high output power. During design, high emphasis was put on operational safety even when the unit is operated inappropriately. DHA V590 is equipped with safety circuitry and internal filters to prevent damage to the connected headphones due to DC voltages at the outputs, power overload and high-frequency overload beyond the audible range. -
Page 12: Maintenance
THE REMOTE CONTROL FOR VIOLECTRIC DHA V590 Function This remote control sends out infrared rays. For that purpose, there is an infrared LED on the front. The remote control should point in direction of the target device to obtain best functionality. - Page 13 Block circuitry VIOLECTRIC DHA V590 Manual DHA V590 March 2022 F. Reim P. 13...
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Page 14: The Power-Switch
THE POWER-SWITCH The unit is put into operation by means of the power switch. The power-on procedure takes about 5 seconds. During this time the “PROTECT” LED flashes red until all internal parameter are checked and found OK. Any breakdown will cause the “PROTECT” LED to come up and the outputs are muted. - Page 15 Please see page 16 to learn more about: “Too loud? Too soft? The PRE-GAIN method” SELECTING / ACTIVATING AN INPUT With the “ANALOGUE INPUTS“ and “DIGITAL INPUTS “ buttons on the front of VIOLECTRIC DHA V590 one of three analogue inputs or one of four digital inputs may be activated. The corresponding LED is illuminated.
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Page 16: Balance Control
, it takes effect on the right channel only. Too loud? Too soft? The PRE-GAIN method The VIOLECTRIC DHA V590 is specially designed to drive headphones. To do so it is placed between up to three analogue or up to four digital sources and the headphones. Headphones however can present load impedances from 8 to 2000 ohms and efficiency ratios from 85 to 115 dB per Milliwatt. - Page 17 HOW TO OPTIMIZE THE PRE-GAIN SETTING: Connect your source to VIOLECTRIC DHA V590 and plug in your headphone. Listen !! Your amp is adjusted best by the individual PRE-GAIN setting when the volume control for “normal”...
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Page 18: Remote Control
THE AMPLIFIER(S) The input signals are fed to an amplifier stage especially designed for this application, with 2 x eight transistors per channel. Because of the true balanced operation VIOLECTRIC DHA V590 houses no less than four of those! All in all, 32 of over 52 transistors of the unit are responsible to process analogue signals. - Page 19 THE BALANCED HEADPHONE OUTPUT CONNECTORS VIOLECTRIC DHA V590 offers two dedicated headphone outputs to connect balanced headphones. The outputs are situated on the front panel and come as a gold plated 4-pin XLR socket and a 4.4 mm Pentaconn. 4-pin XLR Socket Pin-Out:...
- Page 20 The "SIGNAL" switch is located on the back panel in the ”LINE OUTPUTS” field. The line out signal may be sourced from two different positions inside VIOLECTRIC DHA V590 If you want to use the activated input signal as is, maybe to source a unit with its own attenuator or a recording device, then the “PRE-FADER”...
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Page 21: Error Reporting
SIGNAL PROCESSING inside your VIOLECTRIC DHA V590 is always unbalanced. This is no disadvantage as the so called “fully balanced” signal processing often generates more issues that solving them. It is not possible to preserve a reasonable symmetrical integrity of a signal inside a complex... -
Page 22: Software
SOFTWARE Menu 1 – altering the remote control DHA V590 is delivered with the "REMOTE CONTROL" remote. When V590 shall work together with other Violetric items, the programming may be altered. Pushing long (approx. 2 seconds) the “HEAD" button the “Remote Control Menu” is entered, the "HEAD"... -
Page 23: Filter Curves
Filter curves (1) (taken from the data sheet of ES9028PRO) Manual DHA V590 March 2022 F. Reim P. 23... - Page 24 Filter curves (2) (taken from the data sheet of ES9028PRO) P. 24 Manual DHA V590 March 2022 F. Reim...
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Page 25: 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 does not sound too spectacular at the first glance and can be achieved relatively easy. - Page 26 With the volume control fully turned up, the amp would deliver 16 V output at +6 dB gain. Therefore, the volume control would have to be operated very carefully to avoid hearing damage. Moreover, any interference at the input should be avoided since it would be "unforgivingly" amplified as well. With PRE-GAIN, the input level can be reduced by 12 dB (a fourth), with 2 V instead of 8 V input level as the result.
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Page 27: Disposal
lowest possible. The damping factor describes nothing but the ratio between the output 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 DHA V590 having an output impedance of <... -
Page 28: Technical Data
TECHNICAL DATA VIOLECTRIC DHA V590 / DHA V590 All values RMS unwtd., 20 Hz - 20 kHz, Pre-Gain set to 0 dB Input Parameter Analogue Inputs (stereo, analogue): 1 x XLR female, balanced, 2 x RCA, unbalanced Max. Input Voltage:... -
Page 29: Dismantling
Dismantling / Jumper Settings Please note: In the following, the internal settings of the DHA V590 are discussed. For changing these, a TORX T10 screwdriver is required and you should by all means PULL THE MAINS PLUG !!! Only thereafter the settings can be altered without any hazard. Dismantling 1. - Page 30 GENERAL GROUND-LIFT JUMPER (see page 6/7) P. 30 Manual DHA V590 March 2022 F. Reim...
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Page 31: Conformity Statement
EC CONFORMITY STATEMENT We herewith declare that the following unit Name: VIOLECTRIC DHA V590 / DHA V590 Serial No.: -all - is in conformity with the following EC directives: 2014/35/EU Low voltage directive 20014/30/EU EMC directive EN 60065:2014/AC:2016 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 quite effective in that and this is –...
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