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User´s Manual DHA V226, November 2021, F. Reim

9

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 hum or jitter caused by
different ground/earth potentials. Of course, full electrical protection
is granted as the case is always connected to ground/earth
potential!

Electrical safety is always ensured, since the earth conductor is
permanently connected to the enclosure!

Please note that with jumpers not in the ex-works

position EMC emission might occur,

for which the user is responsible only!

So, only change these settings when you

know what you are doing!

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Содержание DHA V226

Страница 1: ...HEADPHONE AMPLIFIER with D A onverter Violectric DHA V226 USER s MANUAL ...

Страница 2: ...2 User s Manual DHA V226 November 2021 F Reim ...

Страница 3: ...ion Power Inputs 14 D A Converters 16 About PRE GAIN 16 Volume Outputs 19 Headphone Connectors 20 Line Outputs Pre Post Setting 21 Error Reporting 22 Things to Know 22 Disposal 27 Technical Data 28 Dismantling Jumper Settings 29 Conformity Statement 30 Warranty 31 CAUTION THE HIGH OUTPUT LEVELS ACHIEVABLE WITH THIS UNIT MAY DAMAGE YOUR HEARING OR THE HEADPHONES ...

Страница 4: ...the Hi Fi and High End market with its specific requirements Who develops equipment The devices are exclusively developed in Germany by the engineers of Lake People electronic GmbH In doing so the team of developers can draw on over thirty 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 Peop...

Страница 5: ...k like it should devices are covered by a 5 years warranty In case of any malfunction during this period they can be shipped to the manufacturer directly Of course the client will benefit from the 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 73...

Страница 6: ...ord Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them paying particular attention 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 suppli...

Страница 7: ... 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 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 m...

Страница 8: ...8 User s Manual DHA V226 November 2021 F Reim The Earth Grounding Concept ...

Страница 9: ... 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 course full electrical protection is granted as the case is always connected to ground earth potential Electrical safety is always ensured since the earth conductor is permanently connected to the enclosure Please note that with jumpers not...

Страница 10: ...specially optimised for dynamic and orthodynamic headphones DHA V226 fulfils even highest demands Features 2 analogue Stereo Inputs unbalanced via RCA sockets gold plated 1 digitale Input USB C PCM 32 Bit 384 kHz DSD 64 256 all inputs switchable from the front LED displays for the activated input PCM or DSD data 32 Bit 384 kHz CS43131 Digital Analogue converter PRE GAIN 7 fold switchable gain atte...

Страница 11: ... Rugged Aluminum case black anodized 5 mm massive Aluminum front panel With its dimensions the VIOLECTRIC DHA V226 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 V226 is equipped with safety circuitry and internal filters to prevent damage to the connected headphones due to DC ...

Страница 12: ...ctual voltage may vary between 190 and 240 volts for flawless operation The mains voltage may be altered to 115 V AC supply inside the unit with the aid of a mains voltage selector In this case stable operation is granted in a range of 85 to 120 V see page 30 A toroidal transformer with 15 Watt is providing the internal operating voltages of 25 V Out of these voltages some more operating voltages ...

Страница 13: ...User s Manual DHA V226 November 2021 F Reim 13 Block circuitry VIOLECTRIC DHA V226 ...

Страница 14: ...muted THE ANALOGUE SIGNAL INPUTS The unbalanced analogue sig nal inputs are situated on the back of the unit Gold plated RCA sockets are provided They are labelled as RCA IN L 1 2 and RCA IN R 1 2 The input impedance on all analogue inputs is 10 kohms Maximum input level should not exceed 21 dBu It is reduced to 3 dBu when PRE GAIN 18 dB is engaged THE DIGITAL SIGNAL INPUT is found on the unit s r...

Страница 15: ...m travel of the volume attenuator The high gain attenuation range of 18 dB factor 64 ensures a perfect match of any source with any headphone in the market Please see page 16 to learn more about Too loud Too soft The PRE GAIN method SELECTING ACTIVATING AN INPUT With the INPUT switch on the front of VIOLECTRIC DHA V226 one of two analogue inputs or the digital input may be activated The correspond...

Страница 16: ...mplifier stage especially designed for this application with 2 x eight transistors per channel Because of the true balanced operation VIOLECTRIC DHA V226 houses no less than four of those The channels are physically separated from each other to ensure optimum crosstalk rejection The frequency range covers 5 Hz 250 kHz 0 5 dB in order to ensure fully linear performance within the entire audible ran...

Страница 17: ... an extremely low self generated noise which can hardly been heard even with highest sensitive in ear monitors IEM On the other hand the amps of DHA V226 with very powerful transformers and with their high operating voltage are able to drive low efficiency or high impedance headphone to the full with ease You will hardly find a headphone driving DHA V226 to its limits This effortless action will s...

Страница 18: ...ttenuator travel is optimized to reduce the self generated noise from the amp THE HEADPHONE AMP PRE GAIN SETTING Ex works all switches are in the lower position 0 dB gain In case you cannot reach the 12 o clock position because the input signal is too loud feel free to reduce the signal with the PRE GAIN steps 6 12 18 dBr factor 0 5 0 25 0 125 In case the signal is too soft even with volume settin...

Страница 19: ...set to their lowest position i e 0 dB PRE GAIN which should be sufficient for most applications THE VOLUME ATTENUATOR is to set the desired volume for the left and right channel simultaneously DE ACTIVATING THE OUTPUTS The OUTPUT switch offers three positions Moving the OUTPUT switch to the HEAD position will activate the headphone outputs The white LED shows the activated state Moving the OUTPUT ...

Страница 20: ... are cut instantly BALANCED HEADPHONE OUTPUT CONNECTORS DHA V226 offers two dedicated headphone outputs to connect balanced headphones The outputs are situated on the front panel and come as a 4 4 mm Pentaconn and a gold plated 4 pin XLR socket 5 pol Pentaconn TRRRS Socket T Tip Left channel R1 Ring 1 Left channel R2 Ring 2 Right channel R3 Ring 3 Right channel S Sleeve Ground 4 pin XLR Socket Pin...

Страница 21: ...ions inside DHA V226 If you want to use the activated input signal as is maybe to source a unit with its own atten uator or a recording device then the PRE FADER or FIXED OUT mode is the right choice Here the input signal is routed directly to the line outputs without any alteration from the volume attenuator If you like to operate your DHA V226 as pre amp device to drive some active speakers or p...

Страница 22: ...om the electronics and the OFF LED is switched to red When the DC voltage has vanished the amp will automatically return to normal operation 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 doesn t sound too spectacular at the first glance and can be ach...

Страница 23: ...ure 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 amp 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 DHA V226 with 2 dB gain factor 1 25 volume control set to full 1st example The pre amplifier provide...

Страница 24: ...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 practically any frequency but the higher the more susceptible the device becomes concerning electro magnetic interference This is not audible in the first place but may interfere with the useful signal and then become evident Therefore unrestr...

Страница 25: ...ced mode this results in a damping factor of 100 balanced and a damping factor of 200 unbalanced Due to general recommendations the output impedance of an amp shall not be higher than 5 of the headphone impedance that means a minimum damping factor of 20 Why are high supply voltages essential A headphone doesn t really require high power but from the equation P U2 R we can see that the square of t...

Страница 26: ...he gain equals 8 dB as two power stages act in push pull mode For high impedance headphones a very high output voltage of 23 V RMS is achieved while low impedance headphones will profit from a power over 3 5 Watt into 100 Ohms per channel Under all operating conditions noise distortion and dynamic range is on the edges of physics Why does a output relay make sense when switching power Amplifiers g...

Страница 27: ... 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 otherwise be caused by inappropriate waste handling of this product The recycling of materials will help to conserve natural resources For more detailed i...

Страница 28: ...5 Ohm unbal 0 5 Ohm bal Dynamic Range 131 dB A wtd Noise 103 dBu A wtd THD N 1kHz 2x10V 100R 1W 102 dB 0 0008 THD N 1kHz 2x4V 32R 0 5W 100 dB 0 001 Crosstalk 105 dB 1 kHz 100 dB 15 kHz Headphone Outputs 1 x 6 3 mm TRS Phone Jack unbal 1 x 4 pol XLR female bal 1 x 4 4 mm TRRRS Pentaconn bal Max Output Level balanced outputs RL x 2 Ua dBu Ua V Pa mW both channels driven 600 29 5 23 2 900 1kHz 0 1 TH...

Страница 29: ...ewdriver is necessary and you should by all means PULL THE MAINS PLUG Only thereafter the settings can be altered without any hazard Dismantling 1 Screw off two upper screws from the front panel 2 Screw off two upper from the back panel 3 Lift the upper case and make your settings 4 Assemble the unit in opposite order ...

Страница 30: ... standards are applied EN 61000 6 1 2019 Generic emission standard residential N 61000 6 2 2019 Generic emission standard industrial EN 61000 6 3 2011 A1 2011 Generic immunity standard residential EN 61000 6 4 2007 A1 2011 Generic immunity standard industrial Product family standard for household appliances multimedia equipment information technology equipment EN 55014 1 2017 EN 55032 2015 EN 5501...

Страница 31: ... the expiration 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 78467 Konstanz E Mail info lake people de Germany Web www 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 th...

Страница 32: ...32 User s Manual DHA V226 November 2021 F Reim ...

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