Coda CL User manual

T I N U
OWNERS M ANUALm M S t
CL/s Vertical FET Stereo Preamplifier
TECHNOLOGI E S I NC.
CHANNEL LEVEL
ULTRA CLASS A FET PREAMPLIFIER
DISC CD/DVD

!
CAUTION
CAUTION
WARNING
WARNING !
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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.
CAUTIONCAUTION
CAUTIONCAUTION
CAUTION: TO PREVENT ELECTRIC SHOCK,
DO NOT REMOVE COVER. NO USER SER-
VICEABLE PARTS INSIDE, REFER SERVIC-
ING TO QUALIFIED SERVICE PERSONNEL.
THIS SYMBOL IS INTENDED TO ALERT
YOU OF THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE
INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE UNIT.
WARNINGWARNING
WARNINGWARNING
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.
CAUTION
•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 recommend that during extended
periods of nonuse that the units power cord
be unplugged from its AC power source.
•Route the AC power cord so that it will not
be damaged or walked on.
PRECAPRECA
PRECAPRECA
PRECAUTIONSUTIONS
UTIONSUTIONS
UTIONS

PRECAUTIONS.................................................1PRECAUTIONS.................................................1
PRECAUTIONS.................................................1PRECAUTIONS.................................................1
PRECAUTIONS.................................................1
INTRODUCTION................................................3INTRODUCTION................................................3
INTRODUCTION................................................3INTRODUCTION................................................3
INTRODUCTION................................................3
WARRANTY.......................................................4WARRANTY.......................................................4
WARRANTY.......................................................4WARRANTY.......................................................4
WARRANTY.......................................................4
DESCRIPTION...................................................9DESCRIPTION...................................................
DESCRIPTION...................................................DESCRIPTION...................................................
DESCRIPTION...................................................
INSTALLATION................................................INSTALLATION...............................................
INSTALLATION................................................ 10INSTALLATION................................................
INSTALLATION................................................
CARE................................................................ 11CARE................................................................
CARE................................................................CARE................................................................
CARE................................................................
SPECIFICATIONS.............................................. 12SPECIFICATIONS..............................................
SPECIFICATIONS..............................................SPECIFICATIONS..............................................
SPECIFICATIONS..............................................
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CONTENTSCONTENTS
CONTENTSCONTENTS
CONTENTS

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INTRINTR
INTRINTR
INTRODUCTIONODUCTION
ODUCTIONODUCTION
ODUCTION
Thank you for selecting Coda Technologies. The
CL/CLS stereo control preamplifier is a precision
instrument that will provide you with many years of
listening enjoyment. Please take a few moments
to read this brief manual to insure maximum ben-
efit from your electronic system.

WARRANTY
I. Warranty- Any failure of Coda products to operate or to meet specifications,
applicable at time of manufacture, due to a manufacturing defect or component
failure, will be corrected by Coda Technologies, Inc. without charge for parts, or labor
for a period of ten years from date of original purchase. Coda Technologies, Inc. will
provide for surface transportation to the Coda factory from an authorized Coda
Technologies, Inc. authorized dealer for a period of one year from date of purchase.
Maximum term for any warranty claim shall be ten years from date of original sale, or
11 years from date of manuafacture, whichever is shorter. Date of manufacture shall
only be defined only manufacture date imbedded in serial number of product.
Warranty shall be transferrable for a period of five years from the date of purchase.
Subsequent owners are required to provide proof of sale/transfer from the original
owner. Original owner may transfer warranty for the entire period of the warranty.
Coda Technologies reserves the right to make the final determination as to validity
of warranty claims in cases where ownership or manufacture date is not clear and
substaniated in writing.
II. Procedure- If the product
dealer. The dealer will arrange for service. Direct shipments to the factory will be
not be accepted without advance written authorization (RMA). Coda products
purchased outside of the U.S. will be covered by those warranty conditions extended by
the importing distributor which may differ in some respects from those given above.
Warranty service, if required, is the responsibility of the importing distributor. If a Coda
Technologies, Inc. product is removed from the country of original purchase, Coda
Technologies, Inc. distributors or dealers are not obligated by the conditions of this
warranty and repairs will be affected at their discretion.
III. Exclusion of Coverage- At the sole opinion of Coda Technologies, Inc. the following
situations are specifically excluded from coverage:
1. Any product not operated in accordance with the instructions contained in this
manual, or otherwise subjected to abuse, tampering, modification, accidental damage,
or serial number defacement.
2. Damage to other property caused by any defects in this product, damages based
upon inconvenience, loss of use of the product, loss of time, commercial loss, or any other
damage whether incidental, consequential, or otherwise.
3. It is Coda Technologies, Inc. policy to extend coverage when reasonable doubt exist;
however, freight and diagnostic charges will be billed for any units returned under
warranty and found by the company to be operating according to specification.
This warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.
CodaTechnologies,Inc.continually researches new techniques, designs, and construction
methods and so reserves the right to introduce refinements into current product lines
without notice or obligation. The company may offer product modifications to make
these refinements available to earlier production units.
should require service under warranty, take it with proof
of purchase date, with its carton and packing material, to a Coda Technologies, Inc.

MODEL DESIGNATION:__________________________________
SERIAL NUMBER:______________________________________
DATE OF PURCHASE:
PLACE OF PURCHASE
Dealer:___________________________________________
Address:__________________________________________
City:_____________________ State:____ Zip:__________
Phone:____________________________________________
PURCHASER
Name:_____________________________________________
Address:__________________________________________
City:_____________________ State:____ Zip:__________
Phone:____________________________________________
WARRANTY REGISTRATION
NOTES:
Fill in and retain this copy of the warranty registration sheet for your records .
To validate your registration, please call, mail, email, or FAX a copy of this registration
to Coda at 916.386.8296 within 30 days of date of purchase. Please include proof of
purchase with your submission.

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DESCRIPTIONDESCRIPTION
DESCRIPTIONDESCRIPTION
DESCRIPTION
The remote controlled CL and CLS preamp-
lifier is designed with the same level of thorough-
ness usually reserved for the finest preamplifier
gain stages. Analytical, as well as subjective
design techniques are all applied in an open-
minded fashion with musical perfection as the
goal.
On the face plate, the straight forward simple
controls and display provide comprehensive func-
tionality to the user. All input selections have LEDs
to show when they are in use. A single knob
controls both volume and balance, with an LED to
show when the knob is in the balance mode.
Settings for the volume and balance are precisely
indicated by the dB attenuation display.
The input stages use FETs which are
transconductance devices, meaning that an input
voltage controls an output current. This eliminates
complex interactions, reducing the chance of cable
characteristics altering the sound. Optional
voltage gain provides exceptional rejection of ex-
ternal noise and contributes to the inherent DC
stability of the circuit. This allows direct coupling
without servo circuitry. The single ended class A
followers used to drive the preamp output are so
linear that no feedback correction is required or
used. The advantage of this stability, is that tran-
sient response is preserved into a wide range of
difficult and unpredictable loads.
The supply starts with a toroidal transformer
and 14,000 uF of capacitance. A reference voltage
is developed by delivering a constant current to
zener diodes. The resulting voltage is heavily
filtered and delivered through class A followers .
The non-reactive low impedance and extremely
wide bandwidth yields a perfect stable power source
for the gain stages.
Rear panel connectors include XLRs which
have the advantage of greater noise rejection than
RCAs. The AC power entry module has a line fuse,
a spare fuse and a power switch. Since the power
draw is low, the preamp may be left on, except
when installing, changing cables, or changing sys-
tem components.

REARPANELCONNECTIONSREARPANELCONNECTIONS
REARPANELCONNECTIONSREARPANELCONNECTIONS
REARPANELCONNECTIONS
Youmayplacethe CL preampwherever is
convenient.However,because of theirlargepower
supplies,amplifiersproducealocalmagneticfield
thatmaybepicked up by lowlevelcircuitysuch as
preamplifiersturntablesandthelike.Forthis
reasonyoushouldprovide at leastafootofspace
betweenthe CL preampandyouramplifier.
Be certainthe CL preampandallassociated
equipment is turnedoffbeforemakinganyconnec-
tions.
A. SELECTORINPUTSA. SELECTOR INPUTS
A. SELECTORINPUTSA. SELECTOR INPUTS
A. SELECTORINPUTS
SignalinputismadethroughtwoXLR(bal-
anced)typeconnectorsandsixgoldplatedRCA
(unbalanced)typeconnectors.TheXLRpincon-
figuration is as follows;ground is pin1,positive is
pin 2, negative is pin 3.
B. TAPEMONITORB. TAPEMONITOR
B. TAPEMONITORB. TAPEMONITOR
B. TAPEMONITOR
Signalinputandoutputconnectionsfor a re-
cordingdevice.
C. PROCESSORC. PROCESSOR
C. PROCESSORC. PROCESSOR
C. PROCESSOR
Signalinputandoutputconnectionsforaaudio
processor(surroundsoundprocessor,equalizer,
etc.).
D. MAIN OUTPUTSD. MAIN OUTPUTS
D. MAIN OUTPUTSD. MAIN OUTPUTS
D. MAIN OUTPUTS
Signaloutputtoyouramplifier is madethrough
twogoldplatedRCA(unbalanced)typeconnec-
torsandtwoXLR(balanced)typeconnectors . The
XLRpinconfiguration is as follows;ground is pin 1,
positive is pin2,negative is pin 3.
E. AC LINEINPUTE. AC LINEINPUT
E. AC LINEINPUTE. AC LINEINPUT
E. AC LINEINPUT
Insertthe power cord into the AC receptacle
and then connect it to an appropriate power source.
The fuse can be removed by pulling the fuse
drawer out and clipping in a newone. Once all
connectionsaremadethepowerswitchmay be
settotheonposition.The CL Preampmay be
left on as it drawsanegligibleamount of power.
Note:theAClinevoltage is preset at thefactory
butmaybechanged by yourCodadealer.
INSTALLATION 6
!
CAUTION
WA RNING
USE ONLY WITH 25V FUSE
TAPE MONITORPROCESSORMAIN OUTPUTS
INPUTOUTPUTINPUTOUTPUTUNBALANCED
SELECTOR INPUTS
RIGHT LEFT
DISCCD/DVDVIDEOBALANCED BALANCED
RIGHT LEFT
FUSE
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
TO PREVENT ELECTRIC SHOCK, DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
POWER
ON
VOLTAGE FUSE TYPE 100V/120V 1 AMP FAST BLOW 5x20mm
220V/240V .5 AMP FAST BLOW 5x20mm
THIS PRODUCT IS DESIGNED, ENGINEERED AND BUILT IN THE UNITED STATES OF AMERICA
LEFTLEFTLEFT
RIGHTRIGHTRIGHT
AC LINE INPUT
SEE SERIAL TAG FOR
POWER REQUIREMENTS
~

FRONT PANEL CONTROLSFRONT PANEL CONTROLS
FRONT PANEL CONTROLSFRONT PANEL CONTROLS
FRONT PANEL CONTROLS
A. VOLUME/BALANCE
Audio level is controlled by this optical pot.
Counterclockwise rotation increases level, clock-
wise rotation decreases level. Left to right balance
is made by pressing the knob, which it then be-
comes a balance control. Rotating it clockwise will
reduce the left channel and counterwise will re-
duce the right channel. Pressing the knob again
will bring it back to being a volume control.
B. RELATIVE dB ATTENUATION DISPLAY
Left and right volume setting is indicated by this
decibel (dB) display. When the display reads 99
there is no decibel attenuation, 00 is the maxi-
mum decibel attenuation and the default setting,
unless additional gain has been selected. See
section G below for detailed information on
setting individual input attenuation or gain.
In addition the display will flash on and off when
the volume is muted.
In between the left and right display is a LED
that lights when the VOLUME/BALANCE control is
active in the balance mode.
C. PROCESSOR LOOP
For switching in a audio processor (surround
sound processor, equalizer, etc.).
D. TAPE MONITOR
For switching in a recording device (tape deck,
mini disk, etc.).
E. MONO
To sum the left and right channels
F. INPUT SELECTION
Primary input selection between one balanced
(XLR) input and three unbalanced (RCA) inputs.
Note that only one selection may be used at a time.
F. INPUT ATTENUATION / GAIN SETUP
Each input has the ability to store a preset gain
or attenuation level. The default value is unity gain.
To program: 1) Press & HOLD the input to program
2) Press the volume knob. Display now shows
default 00 for unity gain. 3) Rotate the volume
knob to select up to 18 db of optional gain.
4) Press input again to store value.
INSTALLATION 7

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INSTINST
INSTINST
INSTALLAALLA
ALLAALLA
ALLATIONTION
TIONTION
TION
REMOTE CONTROLREMOTE CONTROL
REMOTE CONTROLREMOTE CONTROL
REMOTE CONTROL
The CL 2 Preamp may be operated by remote
control.
.1.1.
1.1.
1. CH SELECTORCH SELECTOR
CH SELECTORCH SELECTOR
CH SELECTOR
These up and down buttons select the source
which will be presented to the unbalanced outputs
and balanced outputs.
2.2.
2.2.
2. VOL–,VOL–,
VOL–,VOL–,
VOL–, VOL+VOL+
VOL+VOL+
VOL+
These buttons control the volume and balance
level. VOL–, when in the volume mode, lowers the
volume level. VOL+ raises the volume level. VOL–
, when in the balance mode, raises the left channel
level. VOL+ raises the right channel level.
3.3.
3.3.
3. VOL«»BALVOL«»BAL
VOL«»BALVOL«»BAL
VOL«»BAL
This button toggles the VOL– and VOL+ buttons
between volume control and balance adjust.
4. MUTE4. MUTE
4. MUTE4. MUTE
4. MUTE
This button completely mutes the left and right
channels, which is indicated by the flashing display
on the Audio Window. To unmute you must press
the mute button again. Note: while muted you can
still change the volume level.

If you wish to clean your preamplifier use a
diluted ammonia based window cleaner. Do not
use any abrasive cleaners or chemical solvents.
Take care not to damage the aluminum faceplate,
since aluminum is a medium hardness metal and
can be scratched by the careless use of tools
during installation.
The preamplifier may overheat and the finish
may fade if exposed to direct sunlight or intense
heat sources for prolonged periods.
Save your box and packing material, they may
be necessary for moving or shipping the unit for
servicing by the factory.
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CARECARE
CARECARE
CARE

FREQUENCY RESPONSEFREQUENCY RESPONSE
FREQUENCY RESPONSEFREQUENCY RESPONSE
FREQUENCY RESPONSE
5Hz to -3dB at 200kHz
DISTORTIONDISTORTION
DISTORTIONDISTORTION
DISTORTION
Less than .02% from 10Hz to 40kHz at 6 Volts peak
into 600 Ohms or higher, shunted by 1000 pF or
less
GAINGAIN
GAINGAIN
GAIN
Unity Gain Buffer by default. Variable to +18dB
MAXIMUM OUTPUTMAXIMUM OUTPUT
MAXIMUM OUTPUTMAXIMUM OUTPUT
MAXIMUM OUTPUT
10 Volts peak
NOISENOISE
NOISENOISE
NOISE
More than 100 dBA referenced to 1 Volt output
INPUT IMPEDANCEINPUT IMPEDANCE
INPUT IMPEDANCEINPUT IMPEDANCE
INPUT IMPEDANCE
20k Ohms unbalanced
20k Ohms balanced
OUTPUT IMPEDANCEOUTPUT IMPEDANCE
OUTPUT IMPEDANCEOUTPUT IMPEDANCE
OUTPUT IMPEDANCE
50 Ohms non-reactive unbalanced
100 Ohms non-reactive balanced
CROSSTALKCROSSTALK
CROSSTALKCROSSTALK
CROSSTALK
90dB at 20kHz
POWER SUPPLYPOWER SUPPLY
POWER SUPPLYPOWER SUPPLY
POWER SUPPLY
Toroidal transformer with 14,000 uF of capaci-
tance
DIMENSIONSDIMENSIONS
DIMENSIONSDIMENSIONS
DIMENSIONS
Height: 2.5" Faceplate, 3.0" Overall
Width: 17.0" Faceplate, 17.0" Chassis
Depth: 12.0" Overall
WEIGHTWEIGHT
WEIGHTWEIGHT
WEIGHT
15 lbs
POWER CONSUMPTIONPOWER CONSUMPTION
POWER CONSUMPTIONPOWER CONSUMPTION
POWER CONSUMPTION
20 Watts
SPECIFICATIONS 10