Philips IS 5022 PROFESSIONAL Mark II User manual

‐-. SOUND ENHANCER
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WARNING NOTICES
CAUTION: TOREDUCE THE RISK OFELECTRIC SHOCK, DONOT EXPOSE THIS EQUIPMENT TO
REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. RAIN OR MOISTURE.
This “bolt of lightning” indicates uninsulated material CAUTION: TO PREVENT ELECTRIC SHOCK, MATCH WIDE
within your unit may cause an electrical shock. For the BLADE OF PLUG TO WIDE SLOT, FULLY INSERT.
safety of everyone in your household, please do not
remove product covering.
ATTENTION: POUR EVITER LES CHOCS ELECTRIQUE,
The “exclamation point” calls attention to features for INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE
which you should read the enclosed literature closely DANS LA BORNE CORRESPONDANTE DE LA PRISE ET
to prevent operating and maintenance problems. POUSSER JUSOU’AU FOND.
|The Mains adapter MUST beplacedsuch that ventilation is assured, This means that a
MINIMUMclearance of 5cm (2 inches) is available on top of andaround the Mains adapter.
IMPORTANT SAFETY INSTRUCTIONS
1. Read Instructions -All the safety and operating instructions should be read before the appliance is operated.
2. Retain Instructions -The safety and operating instructions should be retained for future reference.
3. Heed Warnings -All warnings on the appliance and in the operating instructions should be adhered to.
4. Follow Instructions -All operating and use instructions should be followed.
5. Water and Moisture -Do not use this appliance near water -for example, near abath tub, wash bowl, kitchen
sink, or laundry tub, in awet basement, or near aswimming pool, and the like.
6. Carts and Stands -The appliance should be used only with acart or stand that is recommended by the manufac‑
turer.
7. An appliance and cart combination should be moved with care. Quick stops, excessive force, and uneven sur‑
©faces may cause the appliance and cart combination to overturn.
8. Ventilation -Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the
appliance and to protect it from overheating, and these openings must not be blocked or covered. The openings
should never be blocked by placing the appliance on abed, sofa, rug, or other similar surface. This appliance
should never be placed near or over aradiator or heat register. This appliance should not be placed in abuilt-in
installation such as abookcase or rack unless proper ventilation is provided or the manufacturer's instructions have
been adhered to.
9. Grounding or Polarization -This appliance is equipped with apolarized alternating-current line plug (a plug hav‑
ing one blade wider than the other). This plug will fit into the power outlet in only one way. This is asafety feature.
=pr If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug should still fail to fit, con‑
tact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the polarized plug.
10. Power-Cord Protection -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 recepta‑
cles, and the point where they exit from the appliance.
11. Lightning -For added protection for this product during alightning storm, or when it is left unattended and
unused for long periods of time, unplug it from the wall outlet and disconnect the antenna or cable system. This
will prevent damage to the product due to lightning and powerline surges.
12. Overloading -Do not overload wall outlets and extension cords as this can result in arisk of fire or electric
shock.
13. Object and Liquid Entry -Never push objects of any kind into this product through openings as they may touch
dangerous voltage points or short-out parts that could result in afire or electric shock. Never spill liquid of any kind
on the product.
14. Servicing -Do not attempt to service this product yourself, as opening or removing covers may expose you to
dangerous voltage or other hazards. Refer all servicing to qualified service personnel.
15. Damage Requiring Service -Unplug this product from the wall outlet and refer servicing to qualified service
personnel under the following conditions:
a. When the power-supply cord or plug is damaged.
b. If liquid has been spilled, or objects have fallen into the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally by following the operating instructions. Adjust only those controls
that are covered by the operating instructions as an improper adjustment of other controls may result in damage
and will often require extensive work by aqualified technician to restore the product to its normal operation.
e. If the product has been dropped or the cabinet has been damaged.
f. When the product exhibits adistinct change in performance-this indicates aneed for service.
16. Heat -The product should be situated away from heat sources such as radiators, heat registers, stoves, or other
products that produce heat.

IMPORTANT NOTES
INSTRUCTION MANUAL
SCMS
Instruction Manual -3104 125 2167.1
The information in this instruction manual is believed to be accurate and
reliable and may be changed without notice. No liability will be accepted
by the publisher for any consequence of its use. Publication thereof does
not convey nor imply any license under patent -or other industrial or
intellectual property rights.
©COPYRIGHT PHILIPS ELECTRONICS N.V. 1995
All rights are reserved. Reproduction in whole or in part is prohibited
without prior written consent of the copyrights owner.
Printed in the Netherlands;
Date of first release: 11/94
The Sound Enhancer IS 5022 does not comply with the Serial Copy
Management System (SCMS).
Recording or copying is only authorised if there is no violation of copy‑
right or other rights of third parties.
CAUTION: ANY CHANGE OR MODIFICATION TO THE EQUIPMENT BY
THE USER NOT EXPRESSLY APPROVED BY THE MANUFACTURER
COULD VOID THE USER’S AUTHORITY TO OPERATE SUCH EQUIPMENT.

For U.S.A.
This device complies with part 15 of the FCC (U.S.A.)rules. Operation is
subject to the following two conditions:
1.This device may not cause harmful interference, and
2. This device must accept any interference received, including interfer‑
ence that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the
limits for Class Adigital devices, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harm‑
ful interference in acommercial environment. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
For CANADA
This digital apparatus does not exceed the ClassAlimits for radio noise
emissions from digital apparatus as set out in the radio interference reg‑
ulations of the Canadian department of Communications.
Cet appareil numérique n’émet pas de bruits radioélectroniques dépas‑
sant les limites applicables aux appareils numériques de Classe A
prescrit dans la reglement sur le brouillage radioélectroniques édicté pas
le ministére des communications du Canada.

CONTENTS
1GENERAL DESCRIPTION
1INTRODUCTION 1
2AVAILABLE FUNCTIONS AND EFFECTS 2
3ABOUT THIS MANUAL 2
2UNPACKING
1. PROCEDURE j 3
2QUICK FUNCTIONAL CHECK 3
3CONTROLS, INDICATORS &CONNECTORS
1FRONT PANEL 5
2REAR PANEL 9
4INSTALLATION
1. INTRODUCTION 11
2SounD ENHANCER AS SAMPLE RATE CONVERTER 12
3SYNCHRONIZATION (SLAVE MODE) 13
4CALIBRATION 14
4.1 STANDARD CALIBRATION 14
4.2 PREPARATION FOR CALIBRATION 14
4.3 CALIBRATION OF THE OUTPUT 14
4.4 CALIBRATION OF THE INPUT 15
5OPERATION
1SETTING TO worRK 17
2AUDIO EFFECTS a7
2.1 COMBINATIONS OF EFFECTS 18
2.2 ACTIVATING THE EFFECTS 18
2.3 DE-ACTIVATING THE EFFECTS 21
3OVERLOAD CONDITIONS 22
3.1 GAIN CONTROL 22
3.2 ANALOG 22
3.3 DIGITAL 22
4QUANTIZATION NOISE IMAGING 23
5SUBCODE HANDLING 23
6GENERAL RESET 23
6TECHNICAL DATA
1GENERAL 25
2PERFORMANCE 26
3KEY COMPONENTS 28
4FUNCTIONAL DATA 29
5SUB CODE HANDLING 34

1GENERAL DESCRIPTION
1INTRODUCTION
The Sound Enhancer Mark II is aunique combination of:
us Digital Sound Processor for de-clicking and performing awide range
of audio effects
aA/D Converter (20-bit)
=Sample Rate Converter (any valid digital signal between 15 and 50 kHz
to either 44.1 kHz or 48 kHz)
aD/A Converter (DAC-7 bitstream conversion); DAC circuit: dither added
The Sound Enhancer:
mis very easy to use and requires no special skills other than careful
listening.
aWorks in the digital domain, which means that the functions and fea‑
tures work precisely and do not introduce channel differences or
audible noise.
=ls transparent for subcodes (see section 6.5).
=Can operate in astand alone mode or in astudio environment. Slave
mode operation is possible via either word clock or AES/EBU sync.
aAll functions are provided in REAL TIME.
DIGITAL IN DIGITAL OUT
OR
iAD D/A L
ANALOGIN CONVERTER} CONVERTER ANALOG OUT
R R
Figure 1.1: Shows an overall functional diagram of the Sound Enhancer.

2AVAILABLE FUNCTIONS AND EFFECTS
The Sound Enhancer provides the following audio functions:
m=scratch suppression (de-clicking)
mnoise reduction, offering alow-pass filter with an adjustable cut-off
between 16 kHz and 5.5 kHz.
stereo enhancement, allowing astereo effect to be created from a
mono signal
= compression/expansion
afader (digital)
L|
a
bass, treble, and volume control
Quantization Noise Imaging; shifts the quantization noise present in
16 bit digital signals outside the audible frequency range
gjitter removal is implicit in the handling of digital signals
mpitch variations (or varispeed) of up to +12% can be handled without
effecting the output sample rate
=slave mode using either word clock or AES/EBU sync signal
=digital level indication and control via dual LED bars.
For more details see section 6.4.
3ABOUT THIS MANUAL
The Sound Enhancer is extremely versatile. The various configurations
possible (input and output), combined with the available audio effects,
are extensive. Acomplete description of all potential configurations and
applications is well beyond the scope of this manual. Therefore some
experimentation may be required for optimum results. However, the user
is advised to follow this manual closely.
To get the best from the Sound Enhancer:
1. Read and follow the instructions in Chapter 2to unpack and turn the
Sound Enhancer on.
2. Familiarise yourself with the controls, etc. in Chapter 3.
3. Install the Sound Enhancer [connect input(s) and output(s)] as
described in Chapter 4.
4. For operation refer to Chapter 5.
Chapter 6contains atechnical description of the Sound Enhancer.
Reference is made to “Cinch connectors”. In some countries this connec‑
tor is known as an “RCA connector”.

2UNPACKING
The Sound Enhancer |IS5022 series is supplied in various different ver‑
sions. Different mains adapters are supplied in order to accommodate
the various mains requirements around the world. However, all models
have essentially the same operational characteristics.
1PROCEDURE
1. Remove the Sound Enhancer and other equipment from the box in
which it is supplied. It is advisable to keep the box and packing for
future use.
2. The box contains:
=Sound Enhancer itself;
=instruction manual (this document);
=mains adapter;
3. Check that none of the equipment shows signs of being physically
damaged.
4. Check that the mains voltage specified on the mains adapter
corresponds with the local mains supply.
If any parts are damaged or missing, or the mains adapter voltage is
wrong, report the details immediately to your supplier.
For ease of identification, note the 12 digit code number on the under
side of the Sound Enhancer and on the shipping carton. Code number =
9022 67502 2/XX (XX =coding for configuration, voltage and mains fre‑
quency). 01 and 04 =Europe; 02 =United Kingdom; 03, 05 and 06 =UL
(USA). For further information refer to Chapter 6.
2QUICK FUNCTIONAL CHECK
Connect power to the Sound Enhancer as follows. (Refer to figures 3.1
and 3.2 for locations):
1. Ensure that the POWER switch (F1) on the front panel is switched off.
2. Connect the main adapter cable with the mini DIN connector to the
POWER SUPPLY DC IN (B10) socket on the back panel of the Sound
Enhancer.
Figure 2.1: Connecting the poweradapter.

3. Connect the mains cable of the power adapter to amains socket of the
correct voltage (see sticker on mains adapter).
4. Set the POWER switch (F1) on the front panel of the Sound Enhancer to
on.
At first anumber of LEDs may come on and then off. After asecond or
so, only the left-most LEDs in the LED bars and one of the input LEDs
should be on. If, after making the power connections in the proper man‑
ner, no LEDs come on then it is likely that the Sound Enhancer has been
damaged during shipping.
Note: The mains adapter is fitted with athermal overload protector,
which cannot be reset once triggered. To avoid unwanted shut off, suffi‑
cient cooling mustbe providedfor the mains adapter, refer to important
notice printed on the inside cover of this manual.

3CONTROLS, INDICATORS &CONNECTORS
indicators, and connectors located on
the front and back panels of the Sound Enhancer.
7
This chapter describes the controls
1FRONT PANEL
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The front panel is shown in figure 3.1. It is divided into four main func‑
tional blocks. They are, from the left:
mthe power switch
athe effect and input LEDs;
mtwoLeED bars;
athe controls.
These are described in the following sections. For references in brackets,
e.g. (F1), see figure 3.1.
Note: Duringthe production of the SoundEnhancer small changes in
cosmetics andgraphics maybe introduced. Consequently same differ‑
ences between Manual andproduct mayoccur. These changes do not
indicate to majorchanges in operational characteristics.
Power switch
The power switch (F1) is arocker switch which switches D.C. only.
Sync LED (F3)
If avalid digital signal (wordclock or AES/EBU) is received, the SYNC LED
will come on to indicate that the Sound Enhancer is synchronised. The
SYNC LED has two operating modes:
-steady, for wordclock
-isophase/flashing for AES/EBU and SPDIF.
If no sync. signal is received the LED will not come on.
Effect and input LEDs
The effect LEDs (F2) are: SCRATCH, NOISE, STEREO ENHANCEMENT, COM‑
PRESS/EXPAND, BASS, TREBLE, SPATIAL:
muWhen an effect is not active, the LED is off.
aWhen the LED flashes the setting can be adjusted.
aWhen the effect is active the LED is on.
Fader (F2)
When selected, the fade time can be adjusted between 0.5 and 11
seconds. If afade time has been selected, the indicator LED stays on. If
the fade time is set to zero the indicator LED will not come on. The fader
function cannot be toggled on/off by the EFFECTS button (F12).
The input LEDs, DIGITAL (F3) and ANALOG (F4), indicate which input is
selected.
The OVERLOAD LED (F4) comes on when the analog input signal level is
too high. This should be corrected by adjusting the the output level of
the source. Digital overload is indicated by the +1 dB LED of the LED bars;
refer to chapter 5. .
The LED bars
The central part of the front panel contains two horizontal LED bars (F5)
with arange from -60dB to +1dB with green/orange/red graduations.

During normal operation, the LED bars display the audio input signal
level. The upper row is the left channel, the lower row the right channel.
While adjustments are being made to the effects,the LED bars indicate
the amount (or level) of effect being applied, as set by the ADJUST
buttons. In this role the dB scale is not applicable.
Operator controls
The right hand part of the front panel contains the operator controls:
muGAIN (F6) comprises two (left and right) potmeters that adjust the level
of the audio, and thus the balance.
m=The range of the potmeters (gain) is -20 dB to (approx.) +5 dB. If the
potmeters are turned fully anticlockwise the Sound Enhancer is adjust‑
ed for unity gain (1:1). The pot. meters always operate in the digital
domain. If the Sound Enhancer is adjusted for unity gain only the first
LED of the LED bars will light up. The moment the potmeters pass the
position -20 dB the LED bar will display the gain setting.
UNITY GAIN
XN 1:1 XN
=INPUT (F7) is atoggle action push button switch that alternately selects
the digital and analog input. The selected input is indicated by either
the DIGITAL (F3) or ANALOG (F4) LED being on. In order to avoid acci‑
dental switching to another input, the button must be pressed for
about asecond before the switch is made.
mMAXT.S. (F8) is atoggle action, push button, switch that improves
(TS =transient suppression) scratch suppression. The scratch effect
must be activated, only then can TS be activated. When TS is on, it is
indicated by an LED in the switch coming on. MAX T.S . should only be
used in extreme situations, or with mono signals, because its effect is
to virtually reduce stereo to mono. To compensate for this, MAX TS
can be used in combination with the stereo enhancement effect. Max.
TS can be used for mono signals without any detrimental effect.
The next group comprises four yellow toggle action push button
switches. Each of these buttons contains an LED which comes on when
the switch is active.
mwQ.N.I. (F9) activates/de-activates the Quantization Noise imaging effect.
m=FADE (F10) activates the fade effect (when it is enabled, indicated by
the FADER LED being on). The button sequentially activates fade in and
fade out, so care should be taken when using it. During fade-out and
fade-in the LED indicator in the fade button will flash. (See also F2.)

mu44.1 (F11) sets the output sample rate to 44.1 kHz instead of the default
48 kHz. When the LED in the push button is off, the sample rate is
48 kHz. Pressing the switch asecond time reverts the output sample
rate back to 48 kHz. In order to minimize noise during switching, the
change over is implemented via an automatic “mute”. Consequently
switching between sample rates is not instantaneous. In order to mini‑
mize the risk of accidental switching of the sample rate adelay has
been built in. The select button must be pressed for about asecond
before the switch is made.
EFFECTS OFF (F12) switches out the active effects. It can be used to
make acomparison with the raw audio, and thus hear the influence of
the active effects and settings. When the button is pressed asecond
time the effects become active again. If used while an effect LED is
flashing, only that particular effect will be toggled off.
Note: If the SoundEnhancer is switched offallsettings are saved and
will be available next time the unit is switched on again. If the Sound
Enhancer is switched offwhile the EFFECT OFF control is active all
settings andeffects are lost when the SoundEnhancer is next
switched on.
The next group of switches is used to select, adjust, and activate the
effects.
=SELECT (F13) comprises two white push button switches that are used
to sequentially step through the effects:
SCRATCH BASS
NOISE TREBLE
STEREO ENHANCEMENT SPATIAL
COMPRESS/EXPAND FADER
The Aswitch steps forward through the effects and the Wswitch steps
backwards. The selected effect is indicated by its LED flashing and the
LED bar will indicate the level of adjustment. Once the SELECT button
is touched, there is asix second period to start adjusting the setting
(see below). If no adjustment is made the LED bar will revert to indicat‑
ing the audio level.
ADJUST (F14) comprises two red push button switches that are used to
set the level for the selected effect (indicated by the LED flashing).
When either of these switches is pressed the selected effect will be
activated with the set adjustment.
The “+” button increases the effect level and the “-” button decreases
it. The effect level selected is indicated by the LED bars.
When no further adjustment is made for six seconds, the effect LED
stops flashing and stays on.

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The rear panel contains the input and output connectors. For references
in brackets, e.g. (B1), refer to figure 3.2.
=WORD CLOCK (B1) is aBNC connector to which an external word clock
signal can be connected for use instead of the Sound Enhancer’s inter‑
nal clock.
=AES/EBU IN and OUT (B2) are two audio connectors (XLR). The digital
input signal must conform with IEC 958. Any sample rate frequency
between 15 and 50 kHz can be used. No adjustment of the Sound
Enhancer is necessary for different input sample rates. The digital out‑
put signal conforms with IEC 958.
=DIG AES/SPDIF (B3) is atwo position slider switch used to select either
the AES/EBU (B2) input, or the SPDIF input (B8).
mANALOG BALANCED L-IN &R-IN (B4) are two XLR connectors for the
input of balanced analog line-in stereo signals.
=mANALOG BALANCED/UNBALANCED (B5) is atwo position slider switch
used to select either the analog balanced (B4) input, or the unbalanced
input (B7).
msANALOG BALANCED L-OUT &R-OUT (B6)are two XLR connectors for the
output of balanced analog line-out signals.
m=ANALOG OUT/IN (B7)are four Cinch connectors for the input and out‑
put of unbalanced analog line-in and line-out stereo signals.
=DIGITAL IN (SPDIF) (B8) two Cinch connectors are provided. The top
connector is the input, the lower is only afeed through, this may sim‑
plify certain installations. Maximum of two Sound Enhancers may be
connected to one digital source.
mDIGITAL OUT (SPDIF) (B9) two Cinch connectors are provided.
POWER SUPPLY DCIN (B10) is the power input from the mains adapter.
mAUXILIARY CONNECTOR (B11) on the rear panel has been prepared for
an additional mini-DIN connector to facilitate the installation of future
options e.g. remote control, RS232, etc.

4INSTALLATION
1INTRODUCTION
The Sound Enhancer can be used in many different roles and there are
many ways to connect the unit. This chapter lists some, (NOT ALL) of the
most frequently used applications and related installations. Some experi‑
mentation may be necessary.
The Digital Signal Processor in the Sound Enhancer is controlled via the
SELECT switches. However, three principal functions can be performed
without using the SELECT switches. These are:
msA/D conversion;
mD/A conversion;
=Sample rate conversion.
The function is defined by the connected input(s) and output(s). The pos‑
sible input/output combinations are:
=analog/analog the Sound Enhancer acts as an A/D and D/A converter.
=analog/digital the Sound Enhancer acts as an A/D converter;
=digital/analog the Sound Enhancer actsas aD/A converter;
adigital/digital the Sound Enhancer will act as aSample Rate Converter.
In these four modes of operation three different capabilities are provided
by the Sound Enhancer:
-Sample rate conversion
- Synchronization
-Pitch control (varispeed)
These functions are implicit and cannot be disabled by the user; refer to
figure 6.1.
Notes:
1. Make sure the wiring/pin assignment is in accordance with figure 3.2.
Cables should only be connected to, or disconnected from, the Sound
Enhancer when it is switched OFF.
2. Refer to Note on page4for installation of the mains adapter.
3. The mains adapter contains atransformer. In the event that unwanted
influence on the audio performance of other equipment is observed it
maybe necessary to relocate the mains adapter.
4. The SoundEnhancer has no phono amplifier on board, so the phono
output of arecordplayer should notbe connected directly to the
ANALOG IN socket. Instead it mustbe connected to the PHONO IN con‑
nector of an amplifier for RIAA correction.

2SOUND ENHANCER AS SAMPLE RATE CONVERTER
The default setting of the output sampling rate of the Sound Enhancer is
48 kHz.
Push button F11 switches the Sound Enhancer to 44.1 kHz. If 44.1 kHz is
selected the LED indicator in the push button will light up. The Sound
Enhancer will accept:
INPUT OUTPUT
15 -50.4 kHz 44.1 kHz
17 -54 kHz 48 kHz
This range covers most applications:
|Applicationies) =f
Figure 4.1 Sample rate applications.

SYNCHRONIZATION (SLAVE MODE)
The Sound Enhancer can act as aslave. In this mode an external clock
replaces the internal clock. Two sources of external signal can be han‑
dled:
m®asignal at the word clock connector
mavalid AES/EBU digital signal at either the XLR or the SPDIF connector.
While the Sound Enhancer is slaved to the word clock the SYNC LED is
permanently on.
While the Sound Enhancer is slaved to avalid AES/EBU input signal the
SYNC LED flashes.
When no word clock is present and also no digital input signal, the
Sound Enhancer uses its own internal clock. The SYNC LED is then off.
The Sound Enhancer can be synchronized only for 48 kHz and 44.1 kHz.
The Synchronization modes of the Sound Enhancer are arranged in the
following hierarchy:
I wordclock
Il AES/EBU or SPDIF
lll. internal clock, no synchronization.
Note: The SoundEnhancer is notdesigned to be areference clock.
When slaving to AES/EBU it maybe prudent to disconnect the wordclock
cable. When using the external wordclock, connect the coaxial cable
direct via aBNCconnector, do NOT use a“T”’-connector with a75 Q
termination.

4CALIBRATION
4.1 STANDARD CALIBRATION
The Sound Enhancer is factory calibrated for an analog input and output
signal of 15 dBu (unloaded). This means that whenadigital input signal
of 0dB full scale is applied, the balanced analog outputs will be 15 dBu.
Furthermore if an analog input signal of 15 dBu is applied, the digital out‑
puts will be 0dB full scale. This ensures that the full 20 bit digital signal ‑
range of the AD converter is used.
If it is required to adjust or to recalibrate the Sound Enhancer first the
output must be calibrated then the input can be calibrated. Do not
reverse this sequence. The Sound Enhancer can be calibrated for analog
input/output signals between 9and 15 dBu.
4.2 PREPARATION FOR CALIBRATION
1. Switch the Sound Enhancer off if powered up.
2. Make sure the pot. meters on the front panel are fully turned anti‑
clock wise, that is: unity gain.
3. Remove cover, use appropriate TORX screwdriver.
4. Locate XLR PCB (refer to figure 4.2).
Adigital source is required for calibration of the outputs which can be a
CD-player, aDCC or DAT-player etc. It will be more convenient to use a
professional test system like the Audio Precision “System One”.
4.3. CALIBRATION OF THE OUTPUT
Locate the trimpotmeters 3108 and 3109
Select digital input then connect adigital source of 0dBFs (1 kHz)
Connect asuitable dB -meter to the analog balanced outputs (L/R)
Adjust the trimpotmeters so that both outputs give the desired read‑
ing. This is always between 9and 15 dBu.