Coda 40.0 User manual

AMPLIFIER 40.0
OPERATION MANUAL
TECHNOLOGIES INC.
9
4
1
2
3
13
15
14
12
SAFETY PRECAUTIONS
INITIAL SETUP
INTRODUCTION
DETAILED INSTALLATION
DESIGN PHILOSOPHY
TECHNICAL DATA
CARE AND HANDLING
WARRANTY & DISCLAIMER
WARRANTY REGISTRATION
BIAS INPUT
LEFT RIGHT
XLR/GN
RCA/YL
PRECISION BIAS AB AMPLIFIER
40.0 CODA TECHNOLOGIES INC.

!
CAUTION
CAUTION
WARNING
WARNING !
SERVICING TO QUALIFIED SERVICE
CAUTION: TO PREVENT ELECTRIC SHOCK,
DO NOT REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE, REFER
PERSONNEL.
THIS SYMBOL IS INTENDED TO ALERT
YOU OF THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE
INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE UNIT.
THIS SYMBOL IS TO ALERT YOU OF THE
PRESENCE OF UNINSULATED DANGER-
OUS VOLTAGE WITHIN THE UNIT'S
ENCLOSURE THAT MAY BE OF SUFFI-
CIENT MAGNITUDE TO CONSTITUTE A
RISK OF ELECTRIC SHOCK.
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT
EXPOSE THIS UNIT TO RAIN OR MOISTURE. TO
AVOID ELECTRICAL SHOCK, DO NOT OPEN THE
UNIT. REFER SERVICING TO QUALIFIED PERSONNEL.
Never install or remove the power cord from the chassis
unless it has been disconnected from the AC power source
first.
Never pull on the power cord when removing it from an AC
power source. Grasp it by the plug.
Do not leave the power cord connected to an AC power
source unless it is connected to the unit.
It is recommended that during extended periods of nonuse
the unit's power cord be unplugged from its AC power
source.
Route the AC power cord so that it will not be damaged or
walked on.
CAUTION -
-
-
-
-
SAFETY PRECAUTIONS 1

Thank you for purchasing the AMPLIFIER 40.0.
This amplier is a precision device, designed in an eort to provide
the listener with unmatched sound quality through superb design
and construction.
Although its operation is fairly simple, in order to operate your
amplier properly and to realize all of the capabilites of the amplier
we recommend that you read this entire manual carefully.
INTRODUCTION 2

Stereo Amplier Conguration
WARNING: Please ensure that the power switch is turned OFF while you are connecting the
amplier. Connecting or disconnecting cables while the amplier is powered on could
cause damage to your speakers.
NOTE: Ensure that the mode switch located between the input jacks on the rear of the
amplier is set to the stereo position for normal operation. Bridged operation is explained on
page 7.
The diagram below shows the default connections necessary to operate the 40.0 as a
stereo amplier. This is the simplest and most common mode of operation, and the quickest
way to get started. Once these connections are made you can turn the power switch on,
enable the bias from the front panel and start listening to your amplier.
For simplicity this diagram shows an audio conguration using balanced interconnects. This
is the default input mode of the amplier. Unbalanced operation requires that you set the
appropriate input mode as detailed on page 5.
INITIAL SETUP 3
LEFT SPEAKER RIGHT SPEAKER
PREAMPLIFIER
AMPLIFIER 40
!
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE HAZARD,DO NOT EXPOSE
THIS UNIT TO RAIN OR MOISTURE.
AC LINE INPUT
SEE SERIAL TAGFOR
POWER REQUIREMENTS
~
UNBALANCED INPUT
RIGHTLEFT
COMPACT DISC
RIGHTLEFT
TUNER
RIGHTLEFT
VIDEO
RIGHTLEFT
MONITOR
RIGHTLEFTRIGHTLEFT
IN OUT
PROCESSOR
RIGHTLEFTRIGHTLEFT
IN OUT
VIDEO
RIGHTLEFT
UNBALANCED OUTPUT
RIGHTLEFT
TECHNOLOGIES INC.
MODEL
SERIALNUMBER
VOLTAGE REQUIREMENT
MANUFACTURED IN THE USA
HZ
POWERREQUIREMENT V A
FOR CONTINUED PROTECTION
AGAINST SHOCK OR FIRE:
1. REPLACE FUSE WITH SAME
TYPE AND RA TING
2. DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE
BRIDGED
STEREO
DONOT ALLOW AMPLIFIER OUTPUTS
TOCOMMON BETWEEN CHANNELS,
ORCONT ACT CHASSIS OR INPUT
GROUNDS, OR TO BE CONNECTED
TOANY ACTIVE CURRENT SOURCE.
MAIN POWER
OFF ON
AC LINE FUSE CHAR T FUSE AND VOL TAGE SELECTOR
FUSEV ALUE -SEE FUSE CHAR T
VOL TAGESELECTION-
SEEOPERA TION MANUAL
!
NOTE
SEESERIAL T AG FOR POWER
REQUIREMENTS,REMOVE POWER
CORDBEFORE CHANGING
FUSEOR LINE VOL TAGE
!
12
0
AC LINE INPUT
~
TOPREVENT ELECTRIC SHOCK, DO NOT
REMOVECOVER. NO USER SER VICEABLE
PARTS INSIDE. REFER SER VICING TO
QUALIFIED SER VICE PERSONN EL.
CAUTION
CAUTION
W
WARNING ARNING
!
LEFT CHANNEL
UNBALANCED
INPUTS
BALANCED
RIGHT CHANNEL
INPUTS
UNBALANCED
BALANCED
MODE
PUSH
PUSH
VOL TAGE FUSETYPE
100V
120V
220V
240V
12 AMP SLOW BLOW 5 x 20mm
6AMP SLOWBLOW 5 x 20mm
DO NOT CONNECT AMPLIFIER OUTPUT
TERMINALS TOGETHER. CONNECT
AMPLIFIER OUTPUT TERMINALS ONLY TO
SPEAKERS.
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE:
REPLACE FUSE WITH SAME TYPE AND
RATING. DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE
SEE SERIAL TAGFOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
AC LINE INPUT MAINPOWER FUSE / VOLTAGESELECTOR
READ THE BRIDGING SECTION OF THE OPERATINGMANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
BRIDGED MODE
16 AMP
16 AMP
8 AMP
8 AMP
UNBALANCED
BRIDGED
INPUTS
INPUTS
BALANCED
BALANCED
INPUTS
UNBALANCED
PUSH PUSH
230

I. Connections
The connectors and controls are clearly marked on the back panel of the amplifier.
Note the correct left or right channel orientation. The function and channel markings on
the rear panel correspond to the front panel controls and their signal paths.
3. The AC line input should be connected to an AC outlet with the power cable
provided with the amplifier.
5. The power switch can usually be left on when the amplifier is functioning correctly.
With the bias disabled the amplifier will draw negligible current and can thus be left in
“standby” indefinitely.
4. The fuse and voltage selector unit houses a 5x20mm slow-blow fuse and a voltage
selector cartridge. Ensure that the voltage, visible through a small window next to the
AC input, is set to the appropriate voltage for your country. When changing voltages,
ensure that the power cable is disconnected from the amplifier.
DETAILED INSTALLATION 4
3. The MAIN POWER switch, once all appropriate connections are made, may be left on
as the AMPLIFIER S5.5 draws a negligible amount of current when the BIAS is turned off.
4.The FUSE AND VOLTAGE SELECTOR houses a 5 X 20 slow blow fuse and voltage selector
cartridge. Should the fuse blow, contact a Coda dealer or call Coda directly. When
changing the fuse, or altering the voltage selection be sure this unit is disconnected from
it's AC power source.
5.The AC LINE INPUT should be attached to the power cable provided with the amplifier.
After making the appropriate connections insert the three prong safety plug into an
appropriate AC power source. Once the AMPLIFIER S5 is properly connected, the
power switch may be turned on and the LED on the front panel will light indicating a ready
state.
22
3
4
5
1
DO NOT CONNECT AMPLIFIER OUTPUT
TERMINALS TOGETHER. CONNECT
AMPLIFIER OUTPUT TERMINALS ONLY TO
SPEAKERS.
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE:
REPLACE FUSE WITH SAME TYPE AND
RATING. DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE
SEE SERIAL TAG FOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
AC LINE INPUT MAIN POWER FUSE / VOLTAGE SELECTOR
READ THE BRIDGING SECTION OF THE OPERATING MANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
BRIDGED MODE
16 AMP
16 AMP
8 AMP
8 AMP
UNBALANCED
BRIDGED
INPUT
INPUTS
BALANCED
BALANCED
INPUTS
UNBALANCED
PUSH PUSH
230
1. The unbalanced and balanced inputs should be attached to the
appropriate unbalanced and balanced outputs of a preamplfier either directly
or through a crossover or processor, as appropriate to the application.
2. The left output and right output should be attached to the left and right speakers
respectively.
WARNING: There are no fuses on the amplifier’s outputs in order to cut down on
output impedance effects. Speaker protection is left to the manufacturer of your
speakers, as they would best know how to protect their product.
NOTE: If the fuse in your amplifier blows, contact a Coda dealer or call Coda
directly before attempting to use the amplifier again.

II. Front Panel Control Functions and Indicators
1 243 3
4. This two color LED indicates that the main power is on. When it is red the
balanced inputs are in use. When it is yellow the unbalanced inputs are in use.
3. These LEDs, when lit, indicate that the bias is enabled and muting is o.
2. The input selector button switches between the balanced and unbalanced inputs.
1. The bias button enables the bias, eectively "turning on" the amplier's
components, and opens shunting relays that mute the input.
Note: If a power interruption occurs to the system the amplier will power on with the
bias o. Press the bias button to resume use of the amplier.
DETAILED INSTALLATION 5
PRECISION BIAS CLASS A AMPLIFIER
S
5.5
BIAS INPUT LEFT RIGHT
XLR/GN
RCA/YL
BIAS INPUT
LEFT RIGHT
XLR/GN
RCA/YL
PRECISION BIAS AB AMPLIFIER
33.0 CODA TECHNOLOGIES INC.
BIAS INPUT
LEFT RIGHT
XLR/GN
RCA/YL
PRECISION BIAS AB AMPLIFIER
40.0 CODA TECHNOLOGIES INC.

III. BRIDGED SETUP
WARNING:
The 40.0 normally operates in stereo mode, providing a maximum output power of
400 watts Class AB (into an 8-ohm load) per channel. In bridged mode, both
channels act as one amplier providing a maximum output power >1000 watts. For
extremely high-power multi-channel audio applications, multiple 40.0 ampliers can
be used in place of one stereo amplier.
To congure the amplier for bridged mode operation you must enable the bridging
switches inside the amplier. Use a 5/64” hex driver to remove the twelve screws from
the top of the amplier and remove the top cover. The bridging switches are
mounted on a circuit board attached to the audio input jacks inside the amplier.
The diagram below shows the circuit board. The red slide switches below the arrows
are the bridging switches. The arrows show the direction to set the switches to enable
bridging. Reverse the switch positions to enable normal stereo operation.
In bridged mode only one audio input is used. No other input should be connected,
and the bridged mode input must be a balanced signal connected to the XLR
receptacle labeled BRIDGED INPUT. Bridged mode will not operate correctly with an
input adapted from an unbalanced signal. Connecting the input signal to the
receptacle not labeled BRIDGED INPUT will cause no damage, but will cause the
speaker terminal polarities to reverse, with the terminal labeled positive becoming
ground and the terminal labeled ground becoming positive.
The amplier’s speaker terminals are recongured in bridged mode. The le channel
positive terminal becomes the monaural negative terminal and the right channel
positive terminal becomes the monaural positive terminal.
See the next page for a diagram of a stereo amplier conguration using two
bridged mode 40.0 ampliers. Speaker terminals in the diagram are marked with their
bridged mode polarities.
Disconnect the amplier's power cord from the AC supply and set the power switch
to OFF before adjusting the mode switch or connecting or disconnecting any
cables to avoid potential damage to your speakers and personal injury due to high
internal voltages.
DETAILED INSTALLATION 6
BRIDGED
STEREO
MODEL
SERIAL NUMBER
MODE
Back of AMPLIFIER S5

IV. BRIDGED SETUP DIAGRAM
DETAILED INSTALLATION 7
TECHNOLOGIES INC.
MODEL SERIAL NUMBER
VOLTAGEREQUIREMENT
MANUFACTUREDIN THE USA
HZ
POWER REQUIREMENT VA
FOR CONTINUED PROTECTION AGAINST SHOCK OR FIRE: 1. REPLACE FUSE WITH SAME TYPE AND RATING 2. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE
BRIDGED
STEREO
DO NOT ALLOW AMPLIFIER OUTPUTS TO COMMON BETWEEN CHANNELS, OR CONTACTCHASSIS OR INPUT GROUNDS, OR TO BE CONNECTED TO ANY ACTIVE CURRENT SOURCE.
MAIN POWER
OFF ON
AC LINE FUSE CHART FUSE AND VOLTAGE SELECTOR
FUSE VALUE-SEE FUSE CHART VOLTAGESELECTION-
SEE OPERATIONMANUAL
!
NOTE
SEE SERIAL TAGFOR POWER REQUIREMENTS, REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE
!
12 0
AC LINE INPUT
~
TO PREVENT ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SERVICEABLE PARTSINSIDE. REFER SERVICING TO
QUALIFIED SERVICEPERSONNEL.
CAUTION
CAUTION
W
WARNING
ARNING
!
LEFT CHANNEL
UNBALANCED
INPUTS
BALANCED
RIGHT CHANNEL
INPUTS
UNBALANCED
BALANCED
MODE
PUSH
PUSH
VOLTAGE FUSE TYPE
100V 120V 220V 240V
12 AMP SLOW BLOW 5 x 20mm
6 AMP SLOW BLOW 5 x 20mm
Bridged
Output
Bridged
Output
TECHNOLOGIES INC.
MODEL SERIAL NUMBER
VOLTAGEREQUIREMENT
MANUFACTUREDIN THE USA
HZ
POWER REQUIREMENT VA
FOR CONTINUED PROTECTION AGAINST SHOCK OR FIRE: 1. REPLACE FUSE WITH SAME TYPE AND RATING 2. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE
BRIDGED
STEREO
DO NOT ALLOW AMPLIFIER OUTPUTS TO COMMON BETWEEN CHANNELS, OR CONTACTCHASSIS OR INPUT GROUNDS, OR TO BE CONNECTED TO ANY ACTIVE CURRENT SOURCE.
MAIN POWER
OFF ON
AC LINE FUSE CHART FUSE AND VOLTAGE SELECTOR
FUSE VALUE-SEE FUSE CHART VOLTAGESELECTION-
SEE OPERATIONMANUAL
!
NOTE
SEE SERIAL TAGFOR POWER REQUIREMENTS, REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE
!
12 0
AC LINE INPUT
~
TO PREVENT ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SERVICEABLE PARTSINSIDE. REFER SERVICING TO
QUALIFIED SERVICEPERSONNEL.
CAUTION
CAUTION
W
WARNING
ARNING
!
LEFT CHANNEL
UNBALANCED
INPUTS
BALANCED
RIGHT CHANNEL
INPUTS
UNBALANCED
BALANCED
MODE
PUSH
PUSH
VOLTAGE FUSE TYPE
100V 120V 220V 240V
12 AMP SLOW BLOW 5 x 20mm
6 AMP SLOW BLOW 5 x 20mm
Bridged
Output
Bridged
Output
DO NOT CONNECT AMPLIFIER OUTPUT TERMINALS TOGETHER. CONNECT AMPLIFIER OUTPUT TERMINALS ONLY TO SPEAKERS.
FOR CONTINUED PROTECTION AGAINST SHOCK OR FIRE: REPLACE FUSE WITH SAME TYPE AND RATING. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE
SEE SERIAL TAGFOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
AC LINE INPUT MAINPOWER FUSE / VOLTAGESELECTOR
READ THE BRIDGING SECTION OF THE OPERATINGMANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
BRIDGED MODE
16 AMP 16 AMP
8 AMP 8 AMP
UNBALANCED
BRIDGED
INPUT
INPUTS
BALANCED
BALANCED
INPUTS
UNBALANCED
PUSH PUSH
230
DO NOT CONNECT AMPLIFIER OUTPUT TERMINALS TOGETHER. CONNECT AMPLIFIER OUTPUT TERMINALS ONLY TO SPEAKERS.
FOR CONTINUED PROTECTION AGAINST SHOCK OR FIRE: REPLACE FUSE WITH SAME TYPE AND RATING. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE
SEE SERIAL TAGFOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
AC LINE INPUT MAINPOWER FUSE / VOLTAGESELECTOR
READ THE BRIDGING SECTION OF THE OPERATINGMANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
BRIDGED MODE
16 AMP 16 AMP
8 AMP 8 AMP
UNBALANCED
BRIDGED
INPUT
INPUTS
BALANCED
BALANCED
INPUTS
UNBALANCED
PUSH PUSH
230
RIGHT SPEAKER
LEFT SPEAKER
PREAMPLIFIER
!
FOR CONTINUED PROTECTION AGAINST SHOCK OR FIRE HAZARD,DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
AC LINE INPUT SEE SERIAL T AG FOR POWER REQUIREMENTS
~
UNBALANCED INPUT
RIGHTLEFT
COMPACT DISC
RIGHTLEFT
TUNER
RIGHTLEFT
VIDEO
RIGHTLEFT
MONITOR
RIGHTLEFTRIGHTLEFT
IN OUT
PROCESSOR
RIGHTLEFTRIGHTLEFT
IN OUT
VIDEO
RIGHTLEFT
UNBALANCED OUTPUT
RIGHTLEFT

DETAILED INSTALLATION 8
III. REMOTE CONTROL (optional)
WARNING:
The 40.0 may be operated by an optional remote control. Coda provides a remote
manufactured by Universal Remote Control (model MX350) preprogrammed for use
with several Coda ampliers. Before operating the remote, you should read the
manufacturer’s manual in detail in order to understand it’s general functionality and
how to integrate it into your existing audio-visual system.
To operate the 40.0 remotely, select “AMP” from the main menu, then either select
the “BIAS” or “INPUT” entries from the submenu, or use the buttons as indicated
below. These functions correspond to the buttons on the amplier’s faceplate. For
reference, BIAS toggles the state of the bias circuitry (standby) on and o and INPUT
toggles between the balanced and unbalanced audio inputs.
The manufacturer’s manual for the universal remote control gives instructions for
clearing the remote’s settings and restoring it to a “factory” default condition. This
will make the remote INOPERABLE with your Coda amplier. Restoring remote
functionality will require sending your remote back to the Coda factory for
reprogramming. If you are programming your remote for use with other devices and
are unsure if you are going to interfere with Coda programming, contact us at the
phone number or email address on the back of this manual.
OFF ON
MAIN
VOL CH
MUTE
GUIDE
PREV
CH
BIAS
INPUT
CSI
INPUT
TOGGLE
BIAS

I. Design Philosophy and Approach
The subtlety of the design process at this level of performance makes it impossible to
easily explain all of the advantages inherent in the 40.0. However, we present here an
overview to give you an understanding of some of its unique features and an idea of
the listening experience you can expect. Oen a particular technique has numer-
ous unrelated advantages and possibilities. We make every eort to exploit these
advantages with the nal result being an amplier that performs better than the
sum of its individual features suggest.
The topology and component selection is built on the foundation established by
the Coda System 100. Balanced interconnections are provided to take advantage
of their greater noise rejection. Dierential voltage gain throughout provides excep-
tional rejection of external noise and contributes to the inherent DC stability of the
circuit. This allows direct coupling without servo circuitry. The unit also uses output
followers operating without feedback.
Excellent high frequency design insures linear operation at high speed, and trans-
lates into a sonic reproduction which is extremely transparent in character. The power
supply takes a very direct approach to high performance. First, top quality toroidal
transformers and over 200,000uf of capacitance with very low ESR and inductance are
used. For optimum performance and reliability all circuitry remains continuously
powered.
The specications are consistent with what would be expected in a high current ampli-
er design. In this design , however , an unusual degree of attention has been paid to
sonically meaningful parameters.
For example, the current stage is capable of producing peak currents in excess of
100 Amperes with a degree of linearity and speed unmatched by other designs
producing only a fraction of of this current. This is achieved by the implementation of
several distinct circuit features.
Extremely wide bandwidth transistors are used in the output stage instead of the usual
TO3 devices used in other output designs. Each channel uses 28 individual output
transistors with a combined power rating of 1500 Watts and 120 Amperes with a
bandwidth of 50 Mhz.
The 40.0 uses bias voltages and component values which have been specically
selected to produce a precision transition with no abrupt changes in distortion or
output impedance. This “Precision Bias” technique yields seemless performance
regardless of the complexity of the load impedance and is particularly eective at
eliminating IM distortion which oen occurs in these instances.
DESIGN PHILOSOPHY 9