Coda 07X User manual

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SAFETY PRECAUTIONS
INSTALLATION CONNECTIONS
INTRODUCTION
DETAILED INSTALLATION
DESIGN PHILOSOPHY
SPECIFICATIONS & TECHNICAL DATA
CARE AND HANDLING
WARRANTY & REGISTRATION
OPERATION MANUAL
TEC H NOLOGIES INC.
Stereo Preamplier 07X
BALANCE 2 DISC AUX PROCESSOR MONO BYPASS
BALANCE 1
VOL/BAL dB LEVEL
07x PREAMPLIFIER
MAIN LEFT RIGHT
VOLUME/BALANCE

!
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.
1
SAFETY PRECAUTIONS
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
rst.
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 unpluged from its AC power
source.
Route the AC power cord so that it will not be damaged or
walked on.
CAUTION -
-
-
-
-

This preamplier is a precision device, designed in an eort to provide the listener
with unmatched sound quality, design, and construction. In order to operate your
preamplier properly and to realize all of the capabilities of the 07X PREAMPLIFIER
we recommend that you read this entire manual carefully.
2
INTRODUCTION
BALANCE 2
DISC AUX PROCESSOR MONO BYPASS
BALANCE 1
VOL/BAL dB LEVEL
07x PREAMPLIFIER
MAIN LEFT RIGHT
VOLUME/BALANCE
BALANCED 2
PROCESSOR OUT
BALANCED 1
LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT
RIGHT RIGHT LEFT
BALANCED 2
RIGHT LEFT
BALANCED 1
LEFTRIGHT
DISCAUXPROCESSOR INUNBALANCED OUT

Illustrated below is the rear panel of the 07X. The connections are standard and typical of any
audio preamplier. Any unknown features should be adequately explained by the function
descriptions on the following page.
Both sets of balanced receptacles on the le side are identical stereo outputs suitable for
connection to multiple ampliers. The two sets of balanced receptables on the right side
are separate input channels.
Make sure during installation that the AC power connections are interrupted to the
preamplier and all other components are o. While the diagram may be self
explanatory, we strongly recommend that you read the front panel description
on the following page for use instructions.
3
INSTALLATION CONNECTIONS
BALANCED 2
PROCESSOR OUT
BALANCED 1
LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT RIGHT RIGHT LEFT
BALANCED 2
RIGHT LEFT
BALANCED 1
LEFTRIGHT
DISCAUXPROCESSOR INUNBALANCED OUT

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1. The rst four buttons select the input source.
2. The PROCESSOR button switches in an audio processor (surround sound, equalizer, etc.)
3. The MONO button combines the le and right audio channels.
4. The BYPASS button will cause the gain to drop to unity, bypassing the normal 12dB
standard gain of the 07x.
5. Volume and balance setting is indicated by the decibel (dB) display.
FOR VOLUME ADJUSTMENT: The volume display shows "relative" volume level.
When the display reads "99" there is no decibel attenuation, "00" is the maximum decibel
attenuation, andlevel changes occur in 1dB increments.
FOR BALANCE ADJUSTMENT: In the window next to the number display are three iindicator
LEDs, MAIN, LEFT, and RIGHT. In the MAIN mode (blue LED) the display readout shows volume
level. In the LEFT mode (white LED) the display readout shows le balance level. In the RIGHT
mode (red LED) the display readout shows right balance level. In addition the display will ash
on and o when the volume is muted.
When adjusting individual channel level for balancing purposes, the display shows "actual"
decibel level. In other words, the default value of "0" on the LEFT or RIGHT channel mode,
shows that the channel is not attenuated. A value of "99" shows the channel is -99 db below
full volume.
6. The VOLUME/BALANCE is controlled by the optical encoder control . Clockwise rotation
increases level, counter clockwise rotation decreases level. Le balance is selected by
pressing the knob once, and adjusting the level. Right balance is made by pressing the knob
again, and adjusting the level. Pressing the knob once again will bring it back to being a
volume control.
7. To adjust the GAIN of each input ( to match the levels of all the components in the system),
press and hold its selector button while you press the volume knob - then release them both.
The display will switch to "00" and the selected input light will ash.
Turn the volume knob clockwise to raise the input gain up to +18db or turn counter clockwise
to reduce the input level up to -99 db (note that the signs "-"or "+" are not displayed).
To switch back to MAIN, press any button or the knob, or wait een seconds.
BALANCE 2 DISC AUX PROCESSOR MONO BYPASS
BALANCE 1
VOL/BAL dB LEVEL
07x PREAMPLIFIER
MAIN LEFT RIGHT
VOLUME/BALANCE
4
DETAILED INSTALLATION

The 07X can be operated by remote control. The MX-
350 Learning Remote is included with the preamp. 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 ve buttons to the right of the LCD are used to select
the functions shown in the display window. Select [07X]
to control the 07X.
VOL Changes audio level
MUTE Mutes the amplier
ON / OFF Turns bias on and o
PAGE Cycles through available
remote commands.
BAL/1 BAL/2 DISC AUX Selects audio input.
PROC Toggles processor loop
MONO Combines channels
HT BY Toggles bypass mode
BAL <> Selects balance control
GENERAL CONTROLS
07X PAGE 1
07X 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
CO 07
TV
CABLE
CSI/B
CO 07
CO CP
BAL/1
BAL/2
DISC
AUX
PROC
5
DETAILED INSTALLATION
MONO
HT BY
BAL <>
MUTE
MUTE Mutes audio
5 of 5
1 of 5
1 of 2
CO 07

6
DESIGN PHILOSOPHY
The circuity used in the FET PREAMPLIFIER 07x is the result of an advanced and com-
plete design process combining innovation and prove fundamentals. This process
avoids both the limitations of total adherence to convention and the aws resulting
from inappropriate applications of clever circuit gimmicks.
Impedance isolation and matching is derived from FETs. While careful design can
yield good results from any device type, FETs consistently have the edge in voltage
gain, low noise, low interaction, and interface applications.
FETs are inherently transconductance devices, meaning that an input voltage con-
trols an output current. Unlike conventional transistors, FETs have extremely high input
impedance (about 10 meg ohm - similar to vacuum tubes). The FET "senses" the audio
signal without drawing current from the source. This eliminates complex interactions
with the source, allows maximum performance from each system element, and
greatly reduces the chance of cable characteristics altering the sound. The absence
of input current in FETs allows high bias currents for linearity and speed without sacri-
cing DC parameters.
Noise is kept low by multiple paralleling of input devices, careful selection of circuit
impedances, and pre-screening of devices. The Class A complimentary followers
usedto drive the preamp output are of such speed, linearity, and low output imped-
ance that no feedback correction is required or used. The advantage of this is that
the circuit's perfect stability and transient response are preserved into a wide range
of dicult and unpredictable loads. Variation in sound, which could occur through
interactions with interconnect cables and other system elements are thus avoided.
Until recently, perfect volume controls (attenuators) did not exist. This is because
conventional stereo potentiometers have serious channel mistracking (20% typical-
ly),become noisy with age, wear out, and have poor resolution of level - particularly
when operated by a motor as required for remote operation. In an attempt to solve
these problems, many manufacturers have been using "switched attenuators", which
are discrete, resistor ladders built on rotary switches. But while these eliminate chan-
nel mistracking, they introduce new problems, including limited resolution, stepping
transients,and cannot be operated remotely. And they still wear out.
They limit resolution because the most contacts available on rotary switches are
thirty-one. This requires two or three dB steps in order to get enough range out of the
attenuator, which isn't a ne enough resolution for most listeners. Switched attenua-
tors also introduce switching transients ( a "click" or "pop" ) each time they change
positions.
This noise comes from two sources. The rst is mechanical noise from the switch itself
as its ball-detent mechanism moves from detent to detent. But a more troublesome
source is the voltage dierence caused by the change in the musical waveform
during the time it takes the switch to move from one position to the next. The greater
the voltage dierence, the louder the transient.

1. Finishes - All exterior and interior metal parts are anodized. While paint may be more
impact resistant, the anodized surface is more resistant to solvents and prevents
corrosion. Moreover, the anodized parts' appearance can be enhanced by either
graining or bead-blasting the surface.
2. Circuit Board - Circuit boards are berglass epoxy with gold plating over a tin/nickel
barrier. This gold layer will not corrode, while the barrier plate prevents the gold from
migrating to the lower copper layer and detracting from its appearance.
3. Resistors - All are high reliability metal lm 1% resistors.
4. Capacitors - All capacitors are of high quality. The only electrolytics used are in the
power supply where large numbers provide enormous ltering capacitance for the
supply.
5. Semiconductors - There are no integrated circuits (IC) to be found in the circuit path.
Very high quality dual FETs are the only source of voltage gain and were selected for their
superb noise performance and precision matching. The remaining semiconductors are
also of very high quality, each possessing parameters ideally suited for the specic
application.
6. Connectors - Coda employs a standard RCA conguration with a gold plated case.
The balanced connectors are Neutriks from Switzerland.
7. Wire - All signal wire has been eliminated whenever possible. Where wire is used, Coda
employs silver plated copper, 141 strand, 18 guage wire with a silicone insulation.
7
DESIGN PHILOSOPHY

Frequency Response:
-3dB @ 5Hz to 200kHz
Distortion:
< .005% from 10Hz to 40kHz @ 5V peak into 600 ohms or higher, shunted by 1000pF or less.
Gain:
12dB plus 0-18dB variable per input in 1dB steps. Unity gain when Bypass feature is enabled.
Maximum Output:
10V peak
Noise:
<110dBA referenced to 1V output
Input Impedance:
20 kOhms balanced or unbalanced
Output Impedance:
50 Ohms non-reactive unbalanced
100 Ohms non-reactive balanced
Crosstalk:
90dB @ 20kHz
Power Supply Specications:
Regulated supply with shielded toroidal transformer and 19,800uF of low-ESR capacitance
and capacitors smoothing the regulator outputs.
Dimensions:
Height:
Width:
Depth
Weight:
Power Consumption:
2.25” Faceplate, 2.65” Overall
18” Faceplate, 17.0” Chassis
9.75” Overall
14.0 lbs Shipping
10 Watts
8
SPECIFICATIONS

The interior of the amplier requires no special care. If exterior cleaning beyond simple
dusting is required, any dilute ammonia-based product is recommended. Do not use
any abrasive rags, cleaners or chemical solvents on the amplier.
When handling the amplier, take care not to mar the faceplate. Aluminum is a
medium hardness metal and can be scratched by harder tool steels, and the grained
surface can be easily marred if the amplier is set face-down on a hard surface. Do
not rest the amplier on it’s faceplate.
The amplier should not be le in direct sunlight or exposed to intense heat to avoid
damage to internal components or nish.
It is recommended that you do not throw away any shipping material. The box and
packing materials are ideal for moving, and if any service is required they will be
necessary for safe shipment.
9
CARE & HANDLING

I. Warranty- Any failure of the Amplier S5 to operate or to meet specications,
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 and from the factory from an authorized Coda
Technologies, Inc. dealer for a period of one year from date of purchase.
II.Procedure- IftheAmplier S5shouldrequireserviceunderwarranty, takeitwith proof
of purchase date, with its carton and packing material, to a Coda Technologies, Inc.
dealer. The dealer will arrange for service. Direct shipments to the factory will be
accepted at the discretion of the company. Coda Technologies, Inc. products
purchasedoutside of the U.S.will be covered bythose warranty conditionsextended by
the importing distributor which may dier 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 aected at their discretion.
III. Exclusion of Coverage- At the sole opinion of Coda Technologies, Inc. the following
situations are specically excluded from coverage:
1. Any Amplier S5 not operated in accordance with the instructions contained in this
manual,orotherwisesubjectedtoabuse,tampering,modication,accidentaldamage,
or serial number defacement.
2. Damage to other property caused by any defects in this product, damages based
uponinconvenience,lossofuseoftheproduct,lossoftime,commercialloss,oranyother
damage whether incidental, consequential, or otherwise.
3.It is CodaTechnologies, Inc. policy toextendcoverage whenreasonable doubtexist;
however, freight charges will be billed for any units returned under warranty and found
by the company to be operating according to specication.
This warranty gives you specic legal rights, and you may also have other rights which
vary from state to state.
CodaTechnologies,Inc.continuallyresearchesnewtechniques,designs,andconstruction
methods and so reserves the right to introduce renements into current product lines
without notice or obligation. The company may oer product modications to make
these renements available to earlier production units.
i. Warranty - Any failure of the Coda product, hereaer known as the product or
original product, to operate or to meet specications, applicable at time of manu-
facture, due to a manufacturing defect or component failure, will be corrected by
Coda Technologies without charge for parts or labor, for a period of ten years from
date of original purchase. Coda Technologies will provide for surface transportation
to and from the factory for a period of one year from date of original purchase.
ii. Procedure - If the product should require service under warranty contact Coda
Technologies at the location on the back cover of this manual for shipping instruc-
tions. Products purchased outside of the United States will be covered by the
warranty conditions extended by the importing distributor which may dier from
those given above.
vi. Unnecessary Service - In all conditions, if the product is submitted for service and
found to be operated without fault and within specications, shipping charges will be
billed to the customer.
v. Subjective Dierences - No guarantee is made that the product will perform to any
specications that cannot be measured and conmed with precision audio analysis
equipment. Coda Technologies is only obligated to make repairs which will bring the
product into compliance with the specications stated in this manual.
This warranty gives you specic legal rights. You may have other rights which vary
from state to state.
iv. Total Loss and Replacement - If the product is submitted for service due to a
severe malfunction which has caused damage sucient enough to make a repair
attempt infeasible, the product will be replaced with another unit of equal or superior
specications. Coda Technologies product line is frequently updated and changed,
and the specic model and version of the original product may be discontinued at
any time without notice. In this case no guarantees are made that the replacement
unit will be visually similar to the original product.
iii. Exclusion of Coverage - Coda Technologies is not obligated to service the product
in certain conditions, as according to the following subsections.
In these conditions any service will be made at Coda Technologies sole option.
b. The product has been transferred to a third party. This warranty is valid only for
the original purchaser of the product.
c. The product has been transported outside of the United States of America.
i. operation not in accordance with the instructions in this manual
a. The product has been damaged through:
ii. abuse, tampering, modication or accident
iii. serial number defacement
10
WARRANTY & DISCLAIMER
Disclaimer - Coda Technologies cannot be held responsible for any damage caused
by their products, including but not limited to:
a. Damage to speakers caused by failure of a Coda Technologies product to
mute or disable itself as expected or described in its manual.
b. Damage caused by connecting a load to a Coda Technologies product
having an improper impedance as described in the products manual.
d. Damage caused by defects in design, construction or component quality.

MODEL DESIGNATION:
__________________________________
SERIAL NUMBER:
______________________________________
DATE OF PURCHASE:
PLACE OF PURCHASE
Dealer:
Address:
City: State: Zip:
Phone:
PURCHASER
NOTES:
Name:
Address:
City: State: Zip:
Phone:
Fill in this registration sheet and fax or mail it to Coda Technologies to ensure
you are in our warranty system. This will facilitate warranty service should it
become necessary.
It is recommended that you retain a copy of this form for your own records.
Coda Technologies’ address and fax number are located on the back of
this manual.
11
WARRANTY REGISTRATION

MODEL DESIGNATION:
__________________________________
SERIAL NUMBER:
______________________________________
DATE OF PURCHASE:
PLACE OF PURCHASE
Dealer:
Address:
City: State: Zip:
Phone:
PURCHASER
NOTES:
Name:
Address:
City: State: Zip:
Phone:
Fill in this registration sheet and fax or mail it to Coda Technologies to ensure
you are in our warranty system. This will facilitate warranty service should it
become necessary.
It is recommended that you retain a copy of this form for your own records.
Coda Technologies’ address and fax number are located on the back of
this manual.
12
WARRANTY REGISTRATION

SACRAMENTO, CA 95826 USA
TECHNOLOG I E S INC.
7850 CUCAMONGA AVENUE #34
phone [phone]fax [phone]
on the web at CODA.CC
email us at [e-mail]