Coda CSib User manual

TECHNOLOGIES INC
Control Amplifier CSi Balanced
OPERATION MANUAL
b
SAFETY PRECAUTIONS
INTRODUCTION
INSTALLATION & USE
CARE & HANDLING
TECHNICAL DESCRIPTION
TECHNICAL DATA
WARRANTY
1
2
3
6
7
8
10

SAFETY PRECAUTIONS 1
-Never install or remove the power cord from the chassis
unless it has been disconnected from the AC power source
first.
!
!
e
:
WARNING
TO PREVENT ELECTRIC SHOCK, DO
NOT REMOVE COVER. NO USER SERVI-
CABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
CAUTION:
CAUTION:
THIS SYMBOL IS TO ALERT YOU OF THE
PRESENCE OF UNINSULATED DANGER-
OUS VOLTAGE WITHIN THE UNIT’S EN-
CLOSURE THAT MAY BE OF SUFFICIENT
MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK
THIS SYMBOL IS INTENDED TO ALERT
YOU OF THE PRESENCE OF IMPOR-
TANT OPERATING AND MAINTENANCE
INSTRUCTIONS IN THE LITERATURE AC-
COMPANYING THE UNIT
TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EX-
POSE THIS UNIT TO RAIN OR MOISTURE. TO AVOID
ELECTRICAL SHOCK, DO NOT OPEN THE UNIT. REFER
SERVICING TO QUALIFIED PERSONNEL.
-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 non-
use 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.
WARNING
CAUTION

INTRODUCTION 2
Thank you for selecting Coda Technologies and our precison line of of high definition,
high value audio components. The Control Amplifier CSi Balanced is a precision device,
designed in an effort to provide the listener with unmatched sound quality, design,
and construction. The CSib will provide you with many years of listening enjoyment.
The Control Amplifier CSi Balanced is the latest refinement of the Control Amplifier CSi,
itself a substantially improved evolution of the highly regarded Unison Ultra. Most notable
are the styling and industrial design changes, introduced with the CSi, bringing the CSib
harmony with the Coda C series line styling changes introduced in 2006.
The preamplifier and amplifier sections remain virtually unchanged from the Unison Ultra,
while the power supply and output stages have been improved to increase power to
220W per channel.
The CSib also includes an extended preamplifier section incorporating a new balanced
audio input. The preamplifier in the CSib has been fully modularized, becoming a seper-
ate unit from the amplifier itself and increasing future extensibility.
Other functional, optional, or operational changes are noted throughout this manual.
In order to operate your amplifier properly and to realize all of the capabilites of the
CXi, we recommend that you read this entire manual carefully to insure maximum
benefit from your audio system.

INSTALLATION & USE 3
REAR PANEL CONNECTIONS
To provide for adequate ventilation you should allow at least six inches of unobstructed
space above and a couple of inches on each side of the amplifier. Because of its large
power supply, a local magnetic field may be created and picked up by CD players,
turntables and similar equipment. For this reason you should provide at least a foot of
space between the CSib and these components.
A. INPUT SELECTOR
Signal inputs for Disc, Video, Aux and Aux2.
B. MONITOR
Signal inputs and outputs for a tape deck or other recording device.
C. PREAMPLIFIER OUTPUTS
Signal outputs for an additional outboard amplifier.
D. SUBWOOFER OUTPUTS
Variable outputs for a powered subwoofer which track the master volume. Future
upgrades will provide for these 2 outputs to be used independently for Subwoofer
and Center Channel control
E. AMPLIFIER OUTPUTS
Amplified outputs to connect to speakers. To ensure identical speaker phasing
connect both speakers with the same polarity (positive to positive, negative to
negative).
F. POWER SWITCH
Main power switch. This power switch is intended only for complete shutdown while
connecting and disconnecting cables. The rocker switch must be in the “ON” position
for the CSib to operate. Rather than switching off the amplifier entirely when it is not in
use, the bias pushbutton on the front panel should be used to toggle the amplifiers
bias off when it is in standby.
G. AC LINE INPUT AND FUSE HOLDER
110 or 220 volt power input, fused as specified on the rear panel. To replace a
blown fuse, insert a small screwdriver into the slot next to the fuse drawer,
indicated by a fuse icon, and twist to release the drawer. Replacement fuses must
match the original fuse as specified on the rear panel.
~
MAIN POWER
AUX1 VIDEO AUX2 BALANCED
120
C&D A
BGF E

INSTALLATION & USE 4
FRONT PANEL CONTROLS AND OPERATION
A. LEVEL ADJUST
Controls the currently-selected audio level visible on the LED display.
B. MODE
Selects the audio level to adjust. Cycles between volume, left / right channel
attenuation, and subwoofer level.
C. LED DISPLAY
Displays the currently-selected audio level. Level is indicated in decibels, with 99
being maximum volume and 00 being 100dB of attenuation.
D. LEVEL / INPUT INDICATORS
Indicates which audio level is selected for adjustment (right) or which audio input
is selected (left). The three LEDs in the level indicator indicate left and right channels
and subwoofer. The LED indicator for the main volume level is located next to the
MODE pushbutton.
E. BIAS
Toggles the amplifiers bias. With the bias off the amplifier will not produce any audio,
effectively operating in standby. In this mode the amplifier will draw negligible cur
rent, and can be left on indefinitely.
F. SUBWOOFER
Toggles (mutes/unmutes) the subwoofer output.
G. MONITOR
Enables the monitor input, overriding all other inputs.
H. INPUT SELECTOR
Selects the active audio input. Cycles through disc, video, aux and aux2.
b
D H C
F EBG
A

INSTALLATION & USE 5
REMOTE OPERATION
The CSib can be operated by remote control. The MX-
350 Learning Remote is included with the amplifier. The
relevant pages of the remote interface are described
below. For instructions on using the MX-350 itself see the
manual included with the remote.
The five buttons to the right of the LCD are used to select
the functions shown in the display window. Select [CSI]
to control the CSib. The same remote is used for both the
CSib and CSi.
VOL Changes audio level
MUTE Mutes the amplifier
ON / OFF Turns bias on and off
PAGE Cycles through available
remote commands.
DISC VIDEO AUX1 AUX2 Selects audio input.
BAL Cycles through audio level
adjustment modes.
MONIT Selects audio input.
SUBWF Mutes the amplifier
BAL Cycles through audio level
adjustment modes.
GLOBAL CONTROLS
CSI PAGE 1
CSI PAGE 2
OFF ON
MAIN
VOL CH
MUTE
GUIDE
PREV
CH
OFF ON
MAIN
VOL CH
MUTE
GUIDE
PREV
CH
OFF ON
MAIN
VOL CH
MUTE
GUIDE
PREV
CH
CODA
CSI
CSI
CSI
DISC
VIDEO
AUX1
AUX2
BAL
MONIT
SUBWF
BAL

CARE AND HANDLING 6
The interior of the unit requires no special care. If external cleaning beyond simple dusting
is necessary, any dilute commercial ammonia based product will be appropriate. NEVER
use any abrasive rags, cleaners or chemical solvents on Coda products.
When handling the unit, take care not to mar the aluminum. Aluminum is a medium
hardness metal and can be scratched by harder tool steels. Avoid exposing the unit to
direct sunlight, and keep it away from sources of intense heat.
It is recommended that you keep the carton and associated packing material. They are
ideal if you need to pack the unit for transportation and if service is required they will be
absolutely necessary for safe shipment.

DESCRIPTION 7
The remote controlled Coda Control Amplifier CSi Balanced is designed with thorough-
ness reserved only for the finest preamplifier and amplifier gain stages. Analytical design
techniques, both objective and subjective, were applied in an open-minded fashion with
musical perfection as the goal. The CSib features a wide range of design topologies and
components ported from both broad lineage and the most recent advances in the Coda
products and design topologies.
Unlike other integrated amplifiers, the CSib offers true “separates” performance. The CSib
is, internally, essentially a Stereo Amplifier CS with a separate preamplifier section based
on the circuit topology of the Coda Preamplifier CL.
On the faceplate, the straightforward controls and display provide comprehensive func-
tionality to the user. All input selections have LEDs to show when they are in use. Buttons
control both volume and balance, with an LED display to show which channels are
being adjusted. Gain is controlled by a high performance Burr-Brown PGA2310 analog
attenuator. This digitally controlled analogue device features an improved output buffer
and increased voltage swing for high level input signals. Digitally controlled level tracking
allows 1 dB per step attenuation without error. The digitally controlled stepped resistors &
zero crossing detection circuit allow for “zipper-free” operation. Total harmonic distortion is
less than 0.004% with a signal to noise ratio approaching 130 dB.
The preamplifier section has its own separate power supply with multiple independent
transformer taps. A reference voltage is developed by delivering constant current to
zener diodes. The resulting voltage is heavily filtered and delivered through class-A fol-
lowers to provide absolutely stable power to the preamplifier section. A separate power
supply is provided for all controls and microprocessor control system.
In the amplifier section of the CSib, differential voltage gain throughout provides excep-
tional rejection of external noise and contributes to the inherent stability of the circuit. The
front end is designed to provide a slew rate of 50 V/us without entering class B operation
as is common in many other designs. This combined with excellent high frequency design
insures linear operation at high speed.
The amplifier’s overbuilt power supply take a very direct approach to high performance
by utilizing a top quality 2.0 kVA custom toroidal transformer, IXYS high speed rectifiers and
a 60,000µF capacitor filter bank with very low ESR and inductance.
This latest generation output stage design is capable of producing peak currents in
excess of 100 peak amperes with a degree of linearity and speed unmatched by other
designs producing only a fraction of this massive amount of current. This is achieved by
the implementation of several distinct circuit features. Each channel uses 18 individual
output transistors with a combined power rating of over 4,000 watts and 125 amperes and
a bandwidth of 30 MHz. The CSib operates in Class A up to approximately 20 watts. At
higher output levels, the bias section is designed to produce a precision transition with no
abrupt changes in distortion or output impedance. This “Precision Bias” technique yields
seamless performance regardless of the complexity of the load. With such linearity and
bandwidth, only 6db of feedback is used to maintain damping factor while permitting the
minimal value custom emitter resistors to provide current limiting only under extreme con-
ditions that would exceed the output stages high current capabilities. One advantage of
this is a high degree of immunity from interactions with complex speaker loads or cables.

TECHNICAL DATA 8
RATINGS
Rated Power 330 watts @ 8Ω
600 watts @ 4Ω
Class A to 5W @ 8Ω
Frequency Response DC to -3dB @ 100kHz
Distortion < .04% from 10 Hz to 20kHz @ 330 Watts
Gain 26dB
Maximum Current 150 Amperes peak
Noise -110dB referenced to rated output
Input Impedance 50kΩunbalanced/1kΩbalanced
Output Impedance .04Ωfrom 20Hz to 20kHz
POWER SUPPLY
Transformer Type Multi-tap, multi-winding toroidal
Power Filtering 80,000 µF
Transformer Rating 2,000VA
Power Requirement 45 watts @ Standby (bias on)
DIMENSIONS
Height 5.5” Faceplate, 6.0” Overall
Width 17.0” Faceplate, 16.75” Chassis
Depth 14” Overall
Weight 55 lbs.

SACRAMENTO, CA 95826 USA
TECHNOLOGIES INC.
7850 CUCAMONGA AVENUE #31
phone [phone] fax [phone]
on the web at CODA.CC
email us at [email protected]