Lake People G100 Final Edition User manual

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PHONE-AMP G100 Final Edition
USER´s MANUAL

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Content
Theme Page
About Lake People 2
Safety Instructions 4
The Earth / Grounding Concept 6
Connection / Connectors 7
General 8
Operation 9
Special Functions 11
Technical Data 13
Jumper Settings 14
Conformity Statement 15
Warranty 16
Cordial thanks for your decision in favour of a
Lake People product !
Lake People electronic GmbH develops, manufactures and distributes
products in the professional range, for broadcast, television, airports,
exhibition halls, festival venues, theatres, large-scale installations,
private studios and more. In the private sector as well, Lake People
products become increasingly popular due to their outstanding quality.
Who develops Lake People 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 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 People in the early nineties of the past century.

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Who manufactures Lake People equipment ?
The devices are exclusively manufactured in Germany by Lake People
electronic GmbH or contractors in the company's vicinity.
Lake People puts high emphasis on domestic manufacturing. As well, all
component suppliers are chosen in order achieve the main part of
added value inland.
How do Lake People devices get to the customer ?
Lake People devices can be obtained from respective specialist
suppliers. If there is none such accessible regionally, the customer is
supported by transregional distribution partners (google may help...)
and, of course, by Lake People on-line shop.
…and if it doesn't work like it should ?
Lake People 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 Lake
People's full technical support even when warranty has expired. Any
technical questions or need for advice is welcome.
LAKE PEOPLE electronic GmbH
Turmstrasse 7a
D-78467 Konstanz
Fon [phone]
Fax [phone]
Mail: [e-mail]
www.violectric.de www.violectric.com
www.lake-people.de www.lake-people.com

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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 with proper grounding
only.
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 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
BLACK
N
NEUTRAL
BLUE
WHITE
E
PROTECTIVE EARTH
GREEN+YELLOW
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.

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Mains Fuse:
The mains fuse of this appliance is soldered in place and accessible
from the inside only!!
A blown fuse may indicate an internal problem and should be replaced
during qualified servicing or repair work !!
Switchable Power Supply:
Connect this unit to the power source indicated on the equipment rear
panel only to ensure safe operation !!
This unit is provided with an internally settable mains supply for 115 /
230 V AC.
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 !!
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
VOR DEM ÖFFNEN NETZSTECKER
ZIEHEN!! PULL MAINS BEFORE
OPENING!! AVANT D´OUVRIER
RETIREZ LA FICHE MALE!!

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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
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 !

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CAUTION
THE HIGH OUTPUT LEVELS
ACHIEVABLE WITH THIS UNIT MAY
DAMAGE YOUR HEARING
OR THE HEADPHONES
IF OPERATED CARELESSLY !!
Connection / Connectors for Analog Signals
SOURCE
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3
HOT
COLD
SHIELD
X
Balanced Cable (Signal) to (Transformer) Balanced Input
BALANCED INCOMING SIGNAL
XLR MALE PLUG
Shield = Signal Ground = Pin 1
Hot / + Phase = Pin 2
Cold / - Phase = Pin 3
The case of the connector should not be wired
to the shield of the cable. The connector is routed
to earth potential (PE) when plugged into the
corresponding socket of the case !
ANALOG SIGNALS
ANALOG SIGNALS
SOURCE
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3
HOT
GND
SHIELD
X
Unbalanced Cable (Signal) to (Transformer) Balanced Input
BALANCED INCOMING SIGNAL
XLR MALE PLUG
Shield = Signal Ground = Pin 1
Hot / Signal = Pin 2
Cold / Ground = Pin 3
The case of the connector should not be wired
to the shield of the cable. The connector is routed
to earth potential (PE) when plugged into the
corresponding socket of the case !
ANALOG SIGNALS
?
2-wire cable should be prefered !!
zum
Kopfhörer
6.3 mm (1/4”) Phone Jack ( ip - ing - leeve Connector)
T R S
Tip = left Channel
Ring = right Channel
Sleeve = Ground

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GENERAL
The PHONE AMP G100 is a stereo headphone amplifier designed for
low-, medium- and high-Z loads (16 ... 600 ohms), as typical for most
high-quality headsets.
Due to its circuitry layout optimized in terms of noise/THD and specially
adapted to the head-phones mentioned above, the PHONE-AMP G100
fulfils highest quality demands.
Its features comprise:
-Balanced inputs via XLR
-Unbalanced inputs via Cinch
-PRE-GAIN = five selectable gain presets
- High-grade volume control for enhanced linearity
and lowest crosstalk
- Fully split amplifier design
- Two headphone sockets
- Delayed switched on/off headphone outputs by relay
Despite its compact dimensions, the PHONE-AMP G100 offers optimum
flexibility and highest output 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 G100 is equipped with internal filters to
prevent overload by inaudibly high frequencies.
THE CASE
The case of the PHONE-AMP G100 are made of stainless steel while
front and rear panels are made from aluminum. Due to the rigged
materials used, the unit is well protected against mechanical damage.
EARTH AND GROUND
The Case of PHONE-AMP G100 is connected to earth potential. The
internal ground potential may be connected to earth by means of a

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jumper. If required, the jumper may be set to “GND”position (see page
6: “The earth/grounding concept" and page 14: “Jumper settings”).
THE POWER SUPPLY
Mains is connected via a three-pin IEC/CEE socket and a matching
three-wire mains cable with Schuko-type mains connector.
The unit is factory-set to a mains voltage of 230 VAC. Mains voltage
may vary between 190 and 240 V respectively 80 and 120 V without any
effect on flawless operation. The built-in toroidal mains transformer
provides the internal supply voltages of +/- 30 Volt.
THE MAINS FUSE
The internal 0,25 AT fuse is soldered in place on the PCB.
IMPORTANT !!
FOLLOW THE SAFETY INSTRUCTIONS:
A blown fuse may indicate internal problems and should be replaced
during qualified servicing work only !!
THE INPUTS
The signal inputs on the rear are equipped with XLR female-type
sockets, allowing balanced signal injection. They are marked "LEFT"
and "RIGHT" resp.
Balanced Signals XLR Input Wiring:
PIN 1 GND
PIN 2 (+) PHASE
PIN 3 (-) PHASE
For unbalanced signals, two Cinch connectors with integrated break
contacts are provided.
A Cinch plug applied to these sockets will automatically switch off the
balanced input circuitry, thus giving priority the the unbalanced inputs !!

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OPERATION
All controls and displays are located on the front panel.
POWER SWITCH
This switch activates the unit. Power-on status is indicated by the blue
“ON”-LED beneath the switch.
VOLUME CONTROL
The “VOLUME”-control pot determines the headphone volume for both
left and right channel.
THE AMPLIFIERS
The input signals are fed to a stereo amplifier specially designed for this
purpose.

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Its operating range covers nearly DC to 200 kHz (-3dB corner
frequency) in order to ensure optimum linearity within the audible
frequency spectrum.
Overall gain is set to +8 dB to enable the unit to drive high-Z
headphones at sufficient volume.
HEADPHONES OUTPUTS
The PHONE-AMP G100 offers two stereo headphone outputs, each
equipped with a standard 1/4" phone jack.
1/4”Phone Jack:
TIP Left Channel
RING Right Channel
SLEEVE GND
When turning the unit on or off, the outputs are cut from the remaining
circuitry by means of a relay.
Special features
Please note:
The following chapters refer to internal settings of the PHONE-AMP
G100. To alter these settings, a TORX screwdriver T10 is required. The
more, you should by all means
PULL THE MAINS CORD !!!
after which all settings can be performed without any hazard.
There's hum...
Among other reasons, hum results from equalising currents caused by
ground loops, e.g. due to the system being connected to separate mains
outlets. This can be avoided by "soft" or “hard”grounding of the
PHONE-AMP G100: It is achieved by setting the ground lift jumper to
either the “LIFT”or the “GND”position.

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See page 14 in the technical appendix.
In “LIFT”position the internal reference ground becomes insensitive to
low-frequency interference. High-frequency interference however is still
bled off to ground or case respectively.
Full electrical safety is granted all the time since the case is permanently
grounded via the 3-pin mains plug !!
Too loud ? Too soft ? The PRE-GAIN concept
The G100 is specially designed to drive headphones. However, these
can present loads between 8 ... 2000 ohms and efficiency factors
between 85 ... 115 dB/mW. This makes it a little bit difficult to fulfil all
desires, because ...
... owners of high-efficiency headphones may rarely turn the volume
control over the nine-o'clock position without risking hearing damage,
while even the max setting may be too soft for low-efficiency
headphones ...
... all users expect maximum quality at lowest noise and distortion ...
Therefore the circuitry must be able to adapt to these conditions, since
headphones won´t !
THAT'S WHAT WE CALL PRE-GAIN
The adjustment is made in the preamp section, where the signal can be
boosted or attenuated in five 6-dB steps.
See page 14 in technical appendix.
In case you find that the G100 could well be somewhat softer - e.g. in
order to widen the setting range of the volume control - set the
corresponding jumper to the –6dB or -12dB position.
If you find that your G100 could do with some more gain, set the
corresponding jumper to the +6dB or +12dB position.
The unit is factory-preset to the center position (0dB), which should be
suitable for the majority of applications.

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TECHNICAL DATA PHONE-AMP G100
All measurement RMS unwtd., 20 Hz - 20 kHz, Pre-Gain set to 0 dB
Inputs: 2 x XLR female bal, 2 x Cinch, unbal
Max. Input Voltage: + 21 dBu, Impedanz 10 kOhms
Input Impedance: 10 kohms
Nom. Input Sensitivity: +6 dBu
Amplifier Gain: +8 dB
Overall Gain with PRE-GAIN: -4 / +2 / +8 / +14 / +20 dB
Frequency Range: 0 Hz ... 50 kHz (- 0,5 dB) …200 kHz
(-3 dB)
Slew Rate: 8 V / usec
Dynamic Range 2x 600 R: > 125 dB / 129 dB (A-wtd)
Dynamic Range 2x 100 R: > 122 dB / 126 dB (A-wtd)
Noise: < -98 dBu / -101 dBu (A-wtd)
THD+N (1kHz / 2x10V / 100R = 1W) < -100 dB / < 0.001 %
THD+N (1kHz / 2x18V / 600R = 0,5W) < -102 dB / < 0.0008 %
Crosstalk: < -110 dB (1 kHz) / -98 dB (15 kHz)
Max. Output Level: RL(x 2 ) Ua(dBu) Ua(V) Pa(mW)
(1kHz / < 0.1% THD+N) 600 27,8 18,9 595
300 27,3 17,8 1056
240 26,5 16,3 1107
100 24,6 13,2 1742
60 23,1 11,1 2053
40 20,5 8,5 1806
32 18,7 6,7 1402
16 13,1 3,5 765
Mains Supply Voltage: 230 V AC / 115 VAC max. 8 VA
Case, Front, Back: Stainless Steel
Dimensions: 129 x 42 x 170 mm (W x H x D)

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EC CONFORMITY STATEMENT:
We herewith declare that the following unit
Name: LAKE PEOPLE PHONE-AMP G100 FE
Serial No. : -all -
is in conformity with the following EC directives:
2006/95/EG Low voltage directive
20014/30/EC EMC directive
EN 60065:2002+A12:2011 Security directives for audio-,
JIS C6065:2013 video- und similar electronic devices
2001/95/EC General Product Safety Directive
For 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
2011/65/EU, RoHS directive
2012/19/EU, WEEE directive / Member No.: DE 26076388
This declaration is given under responsibility of:
Konstanz 21.08.2016 Fried Reim CEO
LAKE PEOPLE
electronic GmbH
Turmstrasse 7a
D-78467 Konstanz
Fon [phone]
Fax [phone]

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WARRANTY
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 –amongst others - why we
enjoy such a good reputation.
Despite all accurateness faults may show up which may derogate the
proper operation of your product.
In this case your unit is protected by a 2-year Warranty !
Needless to say that we will care for your product even after the
expiration of the warranty. If it is necessary please dispatch your item to:
Lake People electronic GmbH Fon [phone]
Turmstrasse 7a Fax [phone]
D-78467 Konstanz E-Mail [e-mail]
Your warranty claim begins with the date of purchase, which should be denoted on your
proof of purchase.
In case of return do not forget to include the receipt of sales or a copy of the receipt.
Please also include a short description of the fault(s).
For the reshipment we need you correct address !!
Care for a safe packaging. Best is to use the original packaging.
Please keep in mind that we cannot accept collect freight.
We will grant a quick repair and quick return of the unit.
In case of a warranty repair we will reship free of charge.
Please denote here the serial number and the date of purchase:
Serial Number Date of Purchase