lakepeople G103-P-Mk-II PHONE-AMP User Manual

lakepeople G103-P-Mk-II PHONE-AMP

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.

Power Sources:
The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.

Grounding:
Care should be taken that this appliance is operated only properly grounded.

Power Cord:
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 IEC/CEE mains connector and comes with different power cables for different regions.
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

Leiter / CONDUCTOR| Farbe| COLOR| Alternativ| Alternativ
L| Phase| LIVE| Braun| BROWN| Schwarz| BLACK
N| Null| NEUTRAL| Blau| BLUE| Weiss| WHITE
E| | | Erde| EARTH GND| Grün-Gelb| GRN+YLW| Grün| GREEN

U.K. Mains Plug Warning:

A moulded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facility.
NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET.
Do not use the mains plug without the fuse cover in place. Replacement fuse covers can be obtained from your local retailer. Replacement fuses are 13 amps and MUST be ASTA approved to BS 1362.

Mains Fuse:
The mains fuse of this appliance is soldered in place and only accessible from the inside!
A burnt fuse may be an indicator of internal problems and should be replaced during a qualified servicing or repairing works!

Switchable Power Supply:
Connect this unit only to the power source indicated on the equipment rear panel to ensure safe operation!
This unit is intended to be used with a mains supply of 230 V AC.

Service / Repair:
To reduce the risk of fire or electric shock, the user should not attempt to service the appliance beyond that described in the operating manual. All other servicing or repair should be referred to qualified personal!

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 interferences
• this device must accept any interference received, including interference that may cause undesired operation
• this device must not be operated within significant electromagnetic field

The Earth / Grounding Concept

General GROUND-LIFT Jumper (see also page 22/23)

Mind the SECURITY INSTRUCTIONS!

Ex-works this jumper is set to the LIFT position.
The internal ground potential is normally connected to the external earth reference at this point and 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 may be helpful in case of hum or jitter caused by different ground/earth potentials.
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! Electrical safety is always ensured, since the earth conductor is permanently connected to the enclosure!
When the ex-work settings are altered, EMC problems might occur, These are in the field of the user´s responsibility!

Connection / Connectors for Analog Signals

CAUTION
THE HIGH OUTPUT LEVELS ACHIEVABLE WITH THIS UNIT MAY DAMAGE YOUR HEARING OR THE HEADPHONES
IF OPERATED CARELESSLY!

Operation PHONE-AMP G103 Mk II

GENERAL
The PHONE-AMP G103 Mk II is a stereo headphone amplifier. Different to most comparable models the overall gain may be altered with the aid of internal jumpers to better match specific headphone characteristics. Due to this technique, this headphone amplifier is able to drive nearly all existing headphones from 8 … 600 ohms load impedance.
Because of its noise- and THD-optimized circuitry layout, PHONE-AMP G103 Mk II covers high quality demands.

HINT:
Ex works PHONE-AMP G103 Mk II is always set to +6 dB gain mode.
In spite of its compact dimensions, PHONE-AMP G103 Mk II offers optimum flexibility and high power.
Reliability even under rough or improper handling conditions has been another important goal of development.
Thus, the unit is absolutely long-term short-circuit proof.
In addition, the PHONE-AMP G103 Mk II is equipped with filters to prevent overload by inaudibly low and high frequencies.

THE CASE
The case of PHONE-AMP G103 Mk II is made of black anodized aluminium, including the front- and back panels.
This provides high mechanical stability and resistance against rough handling. The cases surfaces are providing excellent electrical conductivity for optimum EMC characteristics.

EARTH AND GROUND
The Case of PHONE-AMP G103 Mk II is connected to earth potential, the internal ground potential may be connected to earth with the aid of a jumper. Ex works the jumper is set to “LIFT” position.
(See page 14 “The earth/grounding concept and page 22/23 “Jumper settings”)

THE POWER SUPPLY
Mains is connected via a three-pin IEC/CEE socket and a matching three-wire mains cable with Central Europe-type mains connector. The mains cable may vary to fit the demands of different markets
The unit is factory-set to a mains voltage of 230 V AC.
Mains voltage may vary between 190 and 250 without any effect on flawless operation. The built-in mains transformers provide the internal supply voltages of approx. +/- 25 V.
THE MAINS FUSE
The 0,25 AT fuse is internally soldered in place on the power supply PCB.
ATTENTION !!

FOLLOW THE SAFETY INSTRUCTIONS

A blown fuse may refer to internal problems and should only been replaced during qualified servicing works!

THE INPUTS – STANDARD VERSION

For unbalanced signal injection gold plated RCA type connectors are provided on the back of the case. They are marked:
“UNBALANCED IN“, “LEFT” and “RIGHT”.

THE INPUTS – PROFESSIONAL VERSION

The signal inputs on the rear are equipped with XLR female type sockets, allowing balanced signal injection. They are marked:
“BALANCED IN”, “LEFT” and “RIGHT”

XLR pin out:

PIN 1| GND
PIN 2| (+) PHASE
PIN 3| (-) PHASE

POWER SWITCH
This switch activates the unit. Operation is indicated by the green “ON”-LED below the switch.

VOLUME CONTROL
The “VOLUME”-control pot determines the headphone volume for both left and right channel. With the aid of the internal gain setting the travel from the volume control may be optimized.
Our recommendation: 12 o´clock for “normal“ listening.
HEADPHONES OUTPUTS
PHONE-AMP G103 Mk II offers two stereophonic headphone outputs.
Each is equipped with a standard 1/4″ phone jacks.
PHONE JACK PINOUT

Both stereophonic phone jacks are connected as follows:

THE AMPLIFIERS
The input signals are fed to special power op-amps which are made to work with high supply voltages.
To match different headphone characteristics the overall gain may be altered with the aid of jumpers.
(See page 22/23 “Jumper Settings” for details).

GAIN ADAPTION
For details see page 22/23 “Jumper Setting” The gain setting serves to adapt the amplifier in a perfect way between the source and the headphones. On one hand it may lower unwanted noise, on the other hand the travel of the volume control may be optimized.
Around the input circuitry the gain may be set to -6 / 0 / +6 dB. Ex works the unit is set to +6 dB, which may be sufficient for most applications. When high sensitivity headphones are used, the jumpers may be set to 0 or
-6 dB gain to reduce gain.
The jumpers near the power op-amps allow a gain of +12 dB instead of 0 dB which may be senseful for low efficiency headphones.
Because these jumpers will render the feedback gain, they will also cause a higher noise level!
Ex works the jumpers are set to +6 dB gain!

DISPOSAL

Disposal of Old Electrical & Electronic Equipment – WEEE Regulation (Applicable in the European Union and other European countries with separate collection systems) 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 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 this product, please contact your local Civic Office, your household waste disposal service or the shop where you purchased the product.

Technical Data PHONE-AMP G103 Mk II

All measurement RMS unweighted, 20 Hz – 20 kHz

• Inputs G103 Mk-II-P: 2 x XLR female, electronically balanced
• Inputs G103 Mk II-S: 2 x RCA / Cinch, unbalanced
• Max. Input: +21 dBu
• Impedance: 10 kohms
• Amplifier Channels: 2 (Stereo)
• Overall Gain: +6 dB
• Variable Gain: -6 / 0 / +6 / +12 / +18 dB selectable
• Frequency range (-0.5dB): 5 Hz … 100 kHz
• Frequency range (- 3dB): 10 Hz … 250 kHz
• Dynamic Range
• 2 x 600R: > 127 dB (A-wtd)
• 2 x 100R: > 124 dB (A-wtd)
• Noise: < -102 dBu (A-wtd)
• THD+N (1kHz 2x 800mW / 100R): < 0,001% / < -100 dB
• Crosstalk: – 90 dB (1 kHz) / -70 dB (15 kHz)
• Output Impedance: < 0,1 Ohm
• Damping Factor (@ 50 Ohm): > 500

Max. output level:
1kHz / < 0.1% THD+N

General

Supply Voltage: 230 V AC / 6 Watt
Case: Aluminium
Front / Back: Aluminium
Case Dimensions: 105 x 42 x 160 mm (WxHxD)
Overall Dimensions: 108 x 45 x 185 mm (WxHxD)

We herewith declare that the following unit:
Name : PHONE-AMP G103 Mk II
Serial No: – all –
Is in conformity with the following EU directives:
2014/35/EU Low voltage directive
20014/30/EU EMC directive
EN 60065:2014/AC:2016 / JIS C6065:2016
Security directives for Audio-, Video- and similar electronic devices
2001/95/EG General Product Safety Directive

For verification of conformity with regards to electromagnetic compatibility the following harmonized 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 55014-2:2015 / EN 55024 :2010+A1 :2015
2011/65/EU, RoHS Directive
2012/19/EU, WEEE Directive
(Member number DE 26076388)
For this declaration the manufacturer is responsible:

References

• Lake People

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