Classe Audio CA-151 User manual

CA-151 ISSUE 2, Nov 2000
CLASSÉ AUDIO
CA-151
POWER AMPLIFIER
CA-151
OWNER'S MANUAL

CA-151 ISSUE 2, Nov 2000
-2-
CLASSÉ DESIGN PHILOSOPHY
1. REPEATED LISTENING DESIGN SESSIONS:
Fine tuning of sound by exchanging and mixing of parts (transistors, capacitors, wiring, PCB
boards etc.), and adjusting many specific operating voltages within proper engineering ranges,
producing an overall sonic recipe giving the most natural harmonic realism of music typical of
instruments in a live performance.
2. UPGRADABLE SINGLE CIRCUIT DESIGNS:
All Classé products (all preamps and all amps) share exactly the same circuit (excluding moving
coil and moving magnet phono circuits). This means all amplifiers and all high level circuits of
the preamps are the same. The same circuit is tailored to different power levels etc. Differences
between less expensive models and more expensive models are parts quality and compliment,
power supply extravagance and the amount of filtering etc., as well as features and packaging.
This means that for years Classé has been constantly fine tuning and upgrading this circuit and
its application, thus reaching a very high level of understanding and musical achievement which
benefits all models - least expensive, most expensive, preamps and amplifiers alike.
3. EXTREME LONG LIFE IN REAL WORLD CONDITIONS:
Choosing the best attainable quality parts and materials combined with the advantages of the two
above-mentioned areas provides Classé owners with years of proven trouble free reliability and
musical enjoyment.

CA-151 ISSUE 2, Nov 2000
-3-
CA-151
OWNER'S MANUAL
TABLE OF CONTENTS
UNPACKING & SET-UP.................................................................... 4
GENERAL CONNECTIONS.............................................................. 5
CONNECTIONS FOR REGULAR OR BALANCED INPUTS…... 7
PROTECTION CIRCUIT..................................................................... 8
SPECIFICATIONS................................................................................12

CA-151 ISSUE 2, Nov 2000
-4-
UNPACKING & SET-UP
Your CLASSÉ CA-151 power amplifier is packed in high density, semi-rigid foam placed in
a special cardboard box. To remove the unit, open and spread all the top flaps of the box and by its
sides, lift out the entire unit and put it on a large flat surface. Take it out of the plastic bag and
inspect the unit for any concealed damage. Apart from this owner's manual, please ensure the
following has also been included:
1) Detachable linecord
Please report any damage or missing parts to your dealer as soon as possible.
Place the CA-151 at or near its final set-up position, allowing 8 inches at the rear for
tightening the speaker output connectors. For optimum sonic performance, we recommend the
optional CLASSÉ REFERENCE A.C. LINECORD. Consult your dealer regarding this accessory.
The power transformer in the CA-151 is located at the front-center of the unit. Ideally, a few
feet should separate this area from components which potentially could pick up hum. These include
preamplifiers, turntables, and interconnect cables. In terms of providing adequate airspace for
cooling, a good rule of thumb is to allow 6 inches above and 3 inches on each side of the unit.
Check the Serial Number sticker on the back of the unit for the correct operating voltage.
The CA-151 has one AC line fuse, the rating of which should be as follows:
LINE VOLTAGE FUSE RATING
100 or 120 V.A.C. 6 AMP FAST BLOW (125 or 250 volts)
220 or 240 V.A.C. 4 AMP FAST BLOW 250 volts

CA-151 ISSUE 2, Nov 2000
-5-
GENERAL CONNECTIONS
A.C. LINE
Insert the linecord into the A.C. receptacle on the rear of the unit. PLEASE MAKE SURE
YOU HAVE PREVIOUSLY HOOKED UP THE SPEAKERS AND PREAMPLIFIER TO
YOUR AMPLIFIER BEFORE CONNECTING THE AC POWER CORD TO THE
AMPLIFIER.
CAUTION: SAFETY INSTRUCTIONS
DISCONNECT AC LINE CABLE WHILE MAKING ALL CONNECTIONS. "FLOATING THE
GROUND” OR DEFEATING THE GROUND ON A 3-PRONG LINECORD MAY CREATE A SHOCK
HAZARD. CONNECT ALL INTERCONNECT CABLES BETWEEN THE ELECTRONICS BEFORE
CONNECTING THE A.C. LINECORDS TO THE WALL OUTLETS. THIS WILL REDUCE THE
POTENTIAL SHOCK HAZARD.
STEREO
Input and output connectors are clearly marked on the back of the amplifier. Left/Right
connections are oriented from the front of the unit. Stereo output connections are marked above the
connectors. Switch stereo/mono switch to [UP] position. (Units preset at factory for STEREO.)
Use only high quality interconnect and loudspeaker cables, and make all connections tight. If
the input plugs are loose, remove them and pinch down the ground leaves slightly with pliers.
Observe correct phasing of the loudspeaker connections, and tighten.

CA-151 ISSUE 2, Nov 2000
-6-
MONO
Please read through the previous Stereo section for general notes on securing good
connections, and safety tips. If the unit has been previously used in stereo, make sure it is OFF, and
remove all connections, including the AC line cable. Make sure the STEREO/MONO switch is
switched to the MONO position [DOWN].
The MONO "Input" is the "left channel input", as marked. The unused right channel input is
automatically disconnected. MONO output connections are marked below the connectors.
Repeat the above MONO settings and connections on the second CA-151 to be used for the
other channel.
Please remember that the negative output connection of a bridged amplifier is NOT a
ground. Do not use a "common ground" or switchbox set-up. Do not use with electronic crossovers
which have a common ground.
REMOTE CONTROL: (OPTIONAL)
With a simple connection from the Classé Remote Interface Module the remote jack at the
back of the amplifier, (see Figure 1) the power amplifier can be turned ON/OFF from a distance (or
from another room).

CA-151 ISSUE 2, Nov 2000
-7-
CONNECTIONS FOR REGULAR OR BALANCED INPUTS:
The CLASSÉ CA-151 power amplifier is equipped with both regular and balanced inputs.
Either one may be used SEPARATELY BUT NOT SIMULTANEOUSLY. The balanced inputs must be
connected to a preamplifier which has balanced main outputs, and balanced interconnects with "XLR"
connectors are also required. Regardless of the amplifier inputs used, stereo or mono operation is
still possible on the CA-151.
REGULAR INPUTS
Switch the REGULAR/BALANCED switch to the position marked "REGULAR" [UP]. (The
amplifier is factory set for regular use.) Connect the regular interconnects to the RCA input jacks on
the rear panels of the CA-151. The balanced connectors are automatically disabled.
BALANCED INPUTS
Switch the REGULAR/BALANCED switch to the position marked "BALANCED" [DOWN]. A
balanced preamplifier and balanced interconnects are also required. For use with balanced
preamplifiers other than Classé, the wiring of the 3-pin XLR connectors must be matched to that of
the CLASSÉ CA-151 which are wired as follows:
PIN 1: GROUND
PIN 2: POSITIVE (NON-INVERTED) SIGNAL
PIN 3: NEGATIVE (INVERTED) SIGNAL
If the pin configuration of the preamplifier differs from above, the balanced interconnects must be
modified to accommodate the different preamp. Having confirmed the correct connections,
plug the XLR connectors of the balanced interconnects into the locking XLR connectors on the rear
panel of the CA-151. (To remove the connectors, press the tab above the connector.)

CA-151 ISSUE 2, Nov 2000
-8-
PROTECTION CIRCUIT
The Classé CA-151 is equipped with rail fuses to protect the output drivers (GDB5, 5 amps
fast blow. fig.2, page 10). In the event that a short circuit or other problems would occur at the
output of the amplifier, one or more of these fuses may blow in an attempt to protect the amplifier. In
addition to the fuses, the unit has a circuit for the detection of unusual distortion characteristics
and/or DC content in the incoming audio signal. There is also an AC line fuse protecting the unit. It
is located at the back of the unit immediately to the right side of the AC receptacle (see fig.1, page
9).
If the protection circuit of the unit is triggered or any of the fuses has blown, the FRONT
PANEL POWER LED will go to BLINKING GREEN.
IF THE PROTECTION CIRCUIT HAS BEEN TRIGGERED, TURN THE CA-151 OFF.
After the situation which triggered the protection circuit has been clearly identified and corrected,
attempt to re-start the unit. IF THE UNIT STILL GOES INTO PROTECTION MODE, OR IF IT
APPEARS THAT PROTECTION FUSES DID BLOW, CONTACT YOUR LOCAL DEALER.
DO NOT TRY TO CHANGE A BLOWN FUSE. REPLACING FUSES AND RE-STARTING
THE UNIT WITHOUT CHECKING FOR COMPONENT FAILURE COULD RESULT IN
FURTHER, SERIOUS DAMAGE TO VITAL COMPONENTS IN YOUR AMPLIFIER.
CONTACT YOUR LOCAL DEALER or Customer Service at the Classé Audio factory---
(514) 636 63 85.

CA-151 ISSUE 2, Nov 2000
-9-

CA-151 ISSUE 2, Nov 2000
-10-
Fig2: CA-151 top view
Positive rail fuse Negative rail fuse Positive rail fuse Negative rail fuse
Left channel Right channel

CA-151 ISSUE 2, Nov 2000
-11-
CLASSÉ AUDIO
5070 Francois-Cusson
Lachine, Quebec
Canada H8T 1B3
Telephone: [phone]
Fax: [phone]

CA-151 ISSUE 2, Nov 2000
-12-
CLASSÉ CA-151
STEREO BALANCED POWER AMPLIFIER
SPECIFICATIONS SHEET
CA-151 FEATURES:
150 watts stereo, 325 watts mono, high current, sleek curved chassis with large dual heat
sinks at rear, both regular and balanced inputs externally switchable. Soft Shadow Silver
faceplate with curved Satin Black side pillars.
CA-151 SPECIFICATIONS:
Frequency Response: 20 Hz to 20 KHz +/- 0.1 dB
Sensitivity: 1.15 Volts in for rated output
Input Impedance: 75 Kohms
Output Impedance: 0.021 Ohm
Gain: 29.02 db
S/N Ratio: 132 dBR
THD+N: 0.006%
Rated output: Stereo Mono
8 Ohms: 150 500 Watts
4 Ohms: 300 900 Watts
Dimensions: Gross: 22" x 19 1/2" x 10 1/2"
Net: 19" x 16 1/2" x 7"
Weight: Gross: 56 lbs.
Net: 46lbs.

CA-151 ISSUE 2, Nov 2000
-13-
Notice to all Classé Product owners:
Thank you for your purchase of a Classé Audio component.
All of us at Classé have taken extreme care to ensure
that your purchase will become a prized investment. We
are proud to inform you that all Classé Audio
components have been officially approved for the
European Community CE mark.
This means that your Classé product has been subjected
to the most rigorous manufacturing and safety tests in
the world, and have proven to meet or exceed all
European Community CE requirements for unit to unit
consistency and consumer safety.
All of us at Classé Audio wish you many years of
musical enjoyment.
As of July 18, 1996, Classé Audio has been granted
Certificate No: C401CLA1.MGS, which indicates CE
approval for all models of the Classé Audio product line.

CA-151 ISSUE 2, Nov 2000
-14-
CLASSÉ CA-151 LIMITED FACTORY WARRANTY (North America only).
Classé Audio Inc. warrants this amplifier to be free from defects in materials and
workmanship for a period of FOUR YEARS from the date of manufacture, provided that any claim
in virtue of this warranty be made in writing within such period.
Subject to all of the conditions stated herein, A LIMITED FACTORY LIFETIME WARRANTY
IS EXTENDED ONLY TO THE ORIGINAL OWNER WHO PURCHASED THE AMPLIFIER IN NORTH
AMERICA AND WHO CLAIMS UNDER THIS WARRANTY IN NORTH AMERICA.
IMPORTANT: WARRANTY REGISTRATION, AND A COPY OF THE "AUTHORIZED DEALER
BILL OF SALE", MUST BE RECEIVED AT THE CLASSÉ FACTORY (address below) WITHIN TWENTY
(20) DAYS OF PURCHASE, TO VALIDATE THIS WARRANTY.
In the event of failure of this amplifier, resulting from defects in materials and
workmanship, Classé Audio Inc. will repair, recalibrate, or at its discretion, replace the unit
providing that all the conditions contained in this warranty are met.
In order to initiate service of any kind, it is necessary to OBTAIN PRIOR FACTORY
AUTHORIZATION, AND SHIP THE UNIT PREPAID TO THE CLASSÉ FACTORY. For units coming
from outside Canada, contact the factory for our forwarding address. Units shipped directly to
our Canadian address from outside the country will be stopped at the border, causing extensive
delays or return of the unit to the sender.
The warranty shall be void and of no effect in the event of any of the following:
1) Operation not in accordance with this manual;
2) Accident, abuse, tampering, or unauthorized
modification, as determined by Classé Audio Inc.;
3) Removal, defacing, or falsifying the serial number plate;
4) Shipping without the complete factory packaging;
5) Transfer or sale of this amplifier by the original owner;
6) Non-compliance with any of the other conditions hereof.

CA-151 ISSUE 2, Nov 2000
-15-
CLASSÉ AUDIO INC. SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES ARISING FROM OR RELATING TO THE SET-UP, OPERATION,
FAILURE, TROUBLESHOOTING, OR REPAIR OF THE AMPLIFIER AND/OR ANY OTHER
EQUIPMENT USED THEREWITH.
THIS WARRANTY, ALL CLAIMS MADE IN VIRTUE HEREOF, AND ALL ISSUES RELATING TO
ANY SUCH CLAIM SHALL BE GOVERNED BY THE LAWS OF THE PROVINCE OF QUÉBEC.

CA-151 ISSUE 2, Nov 2000
-16-
WARRANTY REGISTRATION
You must fill out and return the form below, along with a copy of the authorized dealer
bill of sale, to the factory within twenty (20) days of purchase. This will allow us to provide
expedient service, information regarding updates and new products, and validate the Classé
warranty.
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
CA-151 SERIAL NUMBER______________________________________________________
PURCHASE DATE____________________________________________________________
AUTHORIZED DEALER________________________________________________________
PURCHASER'S NAME_________________________________________________________
STREET ADDRESS____________________________________________________________
CITY________________________________STATE/PROV.____________________________
COUNTRY________________________ZIP/POSTAL CODE__________________________
I BECAME AWARE OF THIS PRODUCT BY:_____________________________________
(DEALER, MAGAZINE, FRIEND, ETC.)
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
SEND TO: CLASSÉ AUDIO INC.
Product Registration
5070 François Cusson
Lachine, Quebec, Canada
H8T 1B3