15 Cover
AMPLIFIER 15.0
OPERATION MANUAL
T
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LEFT
RCA/YL
XLR/GN
BIAS
CODA TECHNOLOGIES INC.
RIGHT
INPUT
15.0
PRECISION CLASS A AMPLIFIER
SAFETY PRECAUTIONS
1
INTRODUCTION
2
INITIAL SETUP
3
DETAILED INSTALLATION
4
DESIGN PHILOSOPHY
9
TECHNICAL DATA
12
CARE AND HANDLING
13
WARRANTY & DISCLAIMER
14
WARRANTY REGISTRATION
15
SAFETY PRECAUTIONS
1
CAUTION
WARNING
!
CAUTION: TO PREVENT ELECTRIC SHOCK,
DO NOT REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE, REFER
SERVICING TO QUALIFIED SERVICE
PERSONNEL.
THIS SYMBOL IS TO ALERT YOU OF THE
PRESENCE OF UNINSULATED DANGEROUS VOLTAGE WITHIN THE UNIT'S
ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A
RISK OF ELECTRIC SHOCK.
!
THIS SYMBOL IS INTENDED TO ALERT
YOU OF THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE
INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE UNIT.
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 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.
INTRODUCTION
Thank you for purchasing the AMPLIFIER 15.0.
This amplifier is a precision device, designed in an effort to provide
the listener with unmatched sound quality through superb design
and construction.
Although its operation is fairly simple, in order to operate your
amplifier properly and to realize all of the capabilites of the
AMPLIFIER 15.0 we recommend that you read this entire manual
carefully.
2
INITIAL SETUP
3
WARNING: Please ensure that the power switch is turned OFF while you are connecting the
amplifier. Connecting or disconnecting cables while the amplifier is powered on could
cause damage to your speakers.
The diagram below shows the default connections necessary to operate the AMPLIFIER 15.0
as a stereo amplifier. 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 amplifier.
For simplicity this diagram shows an audio configuration using balanced interconnects. This
is the default input mode of the amplifier. Unbalanced operation requires that you set the
appropriate input mode as detailed on page 5.
NOTE: Ensure that the mode switch located between the input jacks on the rear of the
amplifier is set to the stereo position for normal operation. Bridged operation is explained on
page 7.
Stereo Amplifier Configuration
PREAMPLIFIER
!
~
AC LINE INPUT
SEE SERIAL T AG FOR
POWER REQUIREMENTS
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE HAZARD,DO NOT EXPOSE
THIS UNIT TO RAIN OR MOISTURE.
UNBALANCED OUTPUT
LEFT
RIGHT
VIDEO
LEFT
IN
RIGHT
LEFT
RIGHT
PROCESSOR
LEFT
OUT
MONITOR
IN
RIGHT
LEFT
INPUTS
RIGHT
OUT
LEFT
VIDEO
RIGHT
LEFT
TUNER
RIGHT
LEFT
RIGHT
COMPACT DISC
LEFT
RIGHT
UNBALANCED INPUT
LEFT
RIGHT
INPUTS
UNBALANCED
UNBALANCED
BRIDGED
INPUTS
BALANCED
PUSH
PUSH
BALANCED
BRIDGED MODE
READ THE BRIDGING SECTION OF THE OPERATING MANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE:
REPLACE FUSE WITH SAME TYPE AND
RATING. DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE
DO NOT CONNECT AMPLIFIER OUTPUT
TERMINALS
TOGETHER.
CONNECT
AMPLIFIER OUTPUT TERMINALS ONLY TO
SPEAKERS.
230
16 AMP
16 AMP
8 AMP
8 AMP
AC LINE INPUT
MAIN POWER
FUSE / VOLTAGE SELECTOR
SEE SERIAL TAG FOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
LEFT SPEAKER
AMPLIFIER 15.0
RIGHT SPEAKER
DETAILED INSTALLATION
4
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.
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.
3. The AC line input should be connected to an AC outlet with the power cable
provided with the amplifier.
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.
NOTE: If the fuse in your amplifier blows, contact a Coda dealer or call Coda
directly before attempting to use the amplifier again.
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.
2
1
INPUTS
2
INPUTS
UNBALANCED
UNBALANCED
BRIDGED
INPUT
BALANCED
PUSH
PUSH
BALANCED
BRIDGED MODE
READ THE BRIDGING SECTION OF THE OPERATING MANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE:
REPLACE FUSE WITH SAME TYPE AND
RATING. DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE
DO NOT CONNECT AMPLIFIER OUTPUT
TERMINALS
TOGETHER.
CONNECT
AMPLIFIER OUTPUT TERMINALS ONLY TO
SPEAKERS.
230
16 AMP
16 AMP
8 AMP
8 AMP
AC LINE INPUT
MAIN POWER
FUSE / VOLTAGE SELECTOR
SEE SERIAL TAG FOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
3
5
4
DETAILED INSTALLATION
5
II. Front Panel Control Functions and Indicators
1. The bias button enables the bias, effectively "turning on" the amplifier's
components, and opens shunting relays that mute the input.
2. The input selector button switches between the balanced and unbalanced inputs.
3. These LEDs, when lit, indicate that the bias is enabled and muting is off.
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.
LEFT
RCA/YL
XLR/GN
RIGHT
BIAS
CODA TECHNOLOGIES INC.
INPUT
15.0
PRECISION CLASS A AMPLIFIER
1 3 4 3
2
Note: If a power interruption occurs to the system the amplifier will power on with the
bias off. Press the bias button to resume use of the amplifier.
DETAILED INSTALLATION
6
III. BRIDGED SETUP
WARNING: Disconnect the amplifier'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.
The 15.0 normally operates in stereo mode, providing a maximum output power of
150 watts Class AB (into an 8-ohm load) per channel. In bridged mode, both
channels act as one amplifier providing a maximum output power of 600 watts. For
extremely high-power multi-channel audio applications, multiple 15.0 amplifiers can
be used in place of one stereo amplifier.
To configure the amplifier for bridged mode operation you must enable the bridging
switches inside the amplifier. Use a 5/64” hex driver to remove the twelve screws from
the top of the amplifier and remove the top cover. The bridging switches are
mounted on a circuit board attached to the audio input jacks inside the amplifier.
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 amplifier’s speaker terminals are reconfigured in bridged mode. The left 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 amplifier configuration using two
bridged mode 15.0 amplifiers. Speaker terminals in the diagram are marked with
their bridged mode polarities.
7
DETAILED INSTALLATION
IV. BRIDGED SETUP DIAGRAM
LEFT SPEAKER
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE:
REPLACE FUSE WITH SAME TYPE AND
RATING. DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE
16 AMP
UNBALANCED
BALANCED
INPUTS
PUSH
BRIDGED
INPUT
INPUTS
PUSH
UNBALANCED
BALANCED
BRIDGED MODE
READ THE BRIDGING SECTION OF THE OPERATING MANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
230
FUSE / VOLTAGE SELECTOR
DO NOT CONNECT AMPLIFIER OUTPUT
TERMINALS
TOGETHER.
CONNECT
AMPLIFIER OUTPUT TERMINALS ONLY TO
SPEAKERS.
!
~
AC LINE INPUT
SEE SERIAL T AG FOR
POWER REQUIREMENTS
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE HAZARD,DO NOT EXPOSE
THIS UNIT TO RAIN OR MOISTURE.
UNBALANCED OUTPUT
LEFT
RIGHT
LEFT
VIDEO
RIGHT
LEFT
IN
RIGHT
PROCESSOR
LEFT
OUT
RIGHT
LEFT
IN
RIGHT
MONITOR
LEFT
OUT
RIGHT
PREAMPLIFIER
LEFT
VIDEO
RIGHT
FOR CONTINUED PROTECTION AGAINST
SHOCK OR FIRE:
REPLACE FUSE WITH SAME TYPE AND
RATING. DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE
16 AMP
8 AMP
8 AMP
MAIN POWER
SEE SERIAL TAG FOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
16 AMP
AC LINE INPUT
8 AMP
8 AMP
16 AMP
LEFT
TUNER
RIGHT
UNBALANCED
BALANCED
INPUTS
PUSH
COMPACT DISC
LEFT
RIGHT
BRIDGED
INPUT
INPUTS
PUSH
UNBALANCED INPUT
LEFT
RIGHT
UNBALANCED
BALANCED
FUSE / VOLTAGE SELECTOR
230
BRIDGED MODE
READ THE BRIDGING SECTION OF THE OPERATING MANUAL OR CONTACT YOUR CODA AUTHORIZED
DEALER TO SET THE BRIDGING SWITCHES
MAIN POWER
SEE SERIAL TAG FOR POWER REQUIREMENTS.
REMOVE POWER CORD BEFORE CHANGING FUSE OR LINE VOLTAGE.
AC LINE INPUT
DO NOT CONNECT AMPLIFIER OUTPUT
TERMINALS
TOGETHER.
CONNECT
AMPLIFIER OUTPUT TERMINALS ONLY TO
SPEAKERS.
RIGHT SPEAKER
DETAILED INSTALLATION
8
III. REMOTE CONTROL (optional)
WARNING: 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 amplifier. 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.
The 15.0 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 amplifiers. 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 15.0 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 amplifier’s faceplate. For
reference, BIAS toggles the state of the bias circuitry (standby) on and off and INPUT
toggles between the balanced and unbalanced audio inputs.
CSI
BIAS
INPUT
BIAS
OFF
ON
MAIN
PREV
CH
MUTE
CH
VOL
GUIDE
INPUT
TOGGLE
DESIGN PHILOSOPHY
9
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 15.0. 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. Often a particular technique has numerous unrelated advantages and
possibilities. We make every effort to exploit these advantages with the final result being an
amplifier 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. Differential voltage gain throughout provides exceptional 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 translates 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 144,000uf
of capacitance with very low ESR and inductance are used. For optimum performance and
reliability all circuitry remains continuously powered.
The specifications are consistent with what would be expected in a high current amplifier 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 30 individual output transistors with
a combined power rating of 1500 Watts and 120 Amperes with a bandwidth of 50 Mhz.
The 15.0 uses bias voltages and component values which have been specifically selected 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
impedance and is particularly effective at eliminating IM distortion which often occurs in these
instances.
DESIGN PHILOSOPHY
10
I. Design Philosophy and Approach (continued)
To maintain “Precision Bias” requires an advanced bias circuit that must have a very
high degree of stability under a wide range of temperatures and load conditions.
Most amplifier bias networks are of such high impedance and poor thermal regulation
that at the extremes of operation, bias currents are ineffectively controlled. Advanced
tracking techniques used in the 15.0 result in absolute control of bias currents under all
conditions.
The main power supply of the amplifier consists of two 2000VA toroidal power
transformers (or one 3000VA transformer in the EU) with independent rectifiers to
isolate the channels from one another. 184,000 microfarads of total capacitance
provide effective filtering of all AC ripple.
These attributes result in a amplifier of such extreme linearity and bandwidth that no
overall feedback correction is required or used. One advantage of this is a high
degree of immunity from interactions with loads or cables and a superior transient
response. An extremely low nonreactive output impedance is maintained well beyond
20,000 hz. The resulting uniform damping factor is not commonly found in other
designs.
The chassis of the 15.0 is constructed of machined aluminum milled to very close
tolerances yielding the seamless appearance characteristic of previous products
from Coda. As with all high-power amplifiers, heat dissipation is important. The 15.0
uses six massive aluminum heat sinks without fans for efficient, noiseless, and clean
thermal relief. The thermal coefficient of the 15.0 heat sinks is one of the lowest and
most effective in the audio industry.
DESIGN PHILOSOPHY
11
II. Material Quality
The amplifier’s chassis is made from machined aluminum. All exterior metal parts are
anodized or powder coated for durability.
Printed circuit boards are fiberglass epoxy with gold plating over a tin/nickel barrier.
The gold layer will not corrode, while the barrier layer prevents the gold from migrating
to the lower copper layer.
All resistors are precision metal film; 1% tolerance for 1/4-watt and 5% tolerance for
1-watt.
Capacitors have been eliminated wherever possible. No electrolytic capacitors are
used except in the power supply, where several high-capacitance electrolytics
provide outstanding filtering of the supply output.
All semiconductor devices are of very high grade. Voltage gain is accomplished with
an extremely high-quality, matched dual FET, chosen for it’s exceptionally low noise
characteristics.
All audio input and output connector contacts are gold-plated, and XLR receptacles
are manufactured by Neutrik of Switzerland. Wire is used as little as possible in the
signal path - only to connect the RCA jacks and speaker terminals to the circuit board
- and what is used is 141-strand silver-plated copper with silicone insulation.
TECHNICAL DATA
12
STEREO
Rated Power:
Frequency Response:
Distortion:
Gain:
Maximum Current:
Noise:
Input Impedance:
Output Impedance:
150 Watts class AB (100 Watts class A) @ 8 Ohms,
300 Watts class AB @ 4 Ohms
DC to -3dB @ 100kHz
< .02 percent from 10Hz to 20kHz @ rated power
26dB
>100 Amperes peak per channel
-120dB referenced to rated output
50k Ohms unbalanced/10k Ohms balanced
.03 Ohms from 20Hz to 20kHz
BRIDGED MONO
Rated Power:
Frequency Response:
Distortion:
Gain:
Maximum Current:
Noise:
Input Impedance:
Output Impedance:
600 Watts class AB @ 8 Ohms,
1200 Watts class AB @ 4 Ohms
DC to -3dB @ 100kHz
< .02 percent from 10 Hz to 20kHz @ rated power
32dB
>100 Amperes peak
-120dB referenced to rated output
N/A unbalanced/10k Ohms balanced
.06 Ohms from 20Hz to 20kHz
POWER SUPPLY
Transformer Type:
Transformer Rating:
Power Filtering:
Multi-tap, multi-winding toroidal
2 x 2 kVA (EU: 1 x 3 kVA)
184,000 µF
DIMENSIONS
Height:
Width:
Depth:
Weight:
Power requirement:
7" Faceplate, 7.75" Overall
17.5" Overall
19" Overall
110 lbs., 115 lbs., Shipping
1K Watts maximum at rated power
CARE AND HANDLING
13
The interior of the amplifier 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 amplifier.
When handling the amplifier, 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 amplifier is set face-down on a hard surface. Do
not rest the amplifier on it’s faceplate.
The amplifier should not be left in direct sunlight or exposed to intense heat to avoid
damage to internal components or finish.
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.
WARRANTY & DISCLAIMER
14
i. Warranty - Any failure of the Amplifier 15.0, hereafter known as the product or
original product, 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 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
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
instructions. Products purchased outside of the United States will be covered by the
warranty conditions extended by the importing distributor which may differ from
those given above.
iii. Exclusion of Coverage - Coda Technologies is not obligated to service the product
in certain conditions, as according to the following subsections.
a. The product has been damaged through:
i. operation not in accordance with the instructions in this manual
ii. abuse, tampering, modification or accident
iii. serial number defacement
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.
In these conditions any service will be made at Coda Technologies sole option.
iv. Total Loss and Replacement - If the product is submitted for service due to a
severe malfunction which has caused damage sufficient enough to make a repair
attempt infeasible, the product will be replaced with another unit of equal or superior
specifications. Coda Technologies product line is frequently updated and changed,
and the specific 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.
v. Subjective Differences - No guarantee is made that the product will perform to any
specifications that cannot be measured and confimed with precision audio analysis
equipment. Coda Technologies is only obligated to make repairs which will bring the
product into compliance with the specifications stated in this manual.
vi. Unnecessary Service - In all conditions, if the product is submitted for service and
found to be operated without fault and within specifications, shipping charges will be
billed to the customer.
This warranty gives you specific legal rights. You may have other rights which vary
from state to state.
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.
WARRANTY REGISTRATION
15
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.
MODEL DESIGNATION:
__________________________________
SERIAL NUMBER:
______________________________________
DATE OF PURCHASE:
PLACE OF PURCHASE
Dealer:
Address:
City:
State:
Zip:
State:
Zip:
Phone:
PURCHASER
Name:
Address:
City:
Phone:
NOTES:
7850 CUCAMONGA AVENUE #34
SACRAMENTO, CA 95826 USA
T
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phone +01 916.383.3653 fax +01 916.455.3653
on the web at CODA.CC
email us at info@coda.cc
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