PERFORMANCE AMPLIFIER II
OWNERS MANUAL
Serial Number
TABLE OF CONTENTS
Introduction
Product Concept and Description
Unpacking
Installation
Cable and Adapter Selection
Electrical Connections
Connection Identification Diagram - Supply Chassis
Connection Identification Diagram - Amplifier Chassis
Choosing Associated Equipment
Operation
Bridged Operation
Maintenance Information
Block Wiring Diagram for Bridged Operation
Additional Instruction
Additional Accessories and Parts
Cello Limited Warranty
Service
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Electrical Specifications
Physical Specifications
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Introduction
PERFORMANCE AMPLIFIER
Congratulations on choosing the
Performance Amplifier. Your unit
has been individually hand-made
from the finest parts and materials.
The Performance Amplifier utilizes
proprietary Cello circuitry that
represents the true state-of-the-art in
audio electronics and is designed to
perform to specifications for decades
of musical enjoyment.
We want your Performance
Amplifier to provide you with
complete satisfaction. Please read
this manual carefully and if you
have any questions, contact your
authorized Cello supplier or call the
factory. It is our wish to assist you
in every way, now and in the future.
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PERFORMANCE AMPLIFIER
Product Concept and Description
CONCEPT
The Performance Amplifier is a
no-compromise design for the
ultimate in residential music and
professional monitor systems. A
combination of musical clarity
, high
output voltage and current
capability enables the Performance
Amplifier to maximize the performance of all high quality speaker
systems. Comprehensively designed to be ultra-reliable and stable,
the Performance Amplifier will
satisfy the most demanding user
and provide decades of trouble-
free operation.
DESCRIPTION
The Performance Amplifier is a
stereo system of four chassis: one
mono power supply and mono
amplifier per channel. The power
supply is a dual choke input design.
Unlike capacitor input supplies
which
utilize
only the peaks of the
AC waveform, the choke input
system uses the whole AC waveform
and is much more efficient. Each
audio amplifier chassis employs 8
driver transistors and 40 250W
output devices per channel on two
electrically conductive heat sink tun-
nels cooled by two very quiet fans.
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Instructions
PERFORMANCE AMPLIFIER
UNPACKING
Inspect the containers for signs of damage
in transit. Report any evidence of abuse
immediately. Open containers carefully
and remove contents from the packing.
Take care not to scratch the surfaces of the
units. Save all boxes and foam pieces for
reuse in the event that the unit must be
moved in the future. If the boxes should
become lost, replacement boxes are
available from the factory.
Contents:
■
2 amplifier chassis
■
2 power supply chassis
■
2 AC power cables
■1DC power cable
■
I set of fuses (5)
■
1 tool kit containing torx key and
'/s
-inch hex key
INSTALLATION
The four chassis can be stacked vertically,
arranged as a pair of supply/amps per
speaker, or arranged as four chassis in a
horizontal row.
When horizontal space is limited, the
units can be set on their front panels. In
this case, place a piece of thick (.2 inches)
cloth, felt or thin foam under each front
panel to prevent scratching its metal
finish.
When arranged in a set of two units
by two units or four horizontally, make
sure that fan exhaust from one amp does
not blow directly into the intake of the
other, or the second set may overheat and
shut off.
When stacked, you may wish to place
the supplies on top because the circuit
breaker/power switches are located on
these units. This is not important if a
remote A.C. switch is used.
Be certain that the amps are installed so
that they have proper ventilation. Placing
the units in small, close-fitting enclosures
is not recommended. Room air temperature should not exceed 122 degrees F./50
degrees C.
CABLE & ADAPTER SELECTION
The Performance Amplifier has three-pin
Fischer connectors for highest quality
balanced line input capability. It is
recommended that input connections be
made using Cello Strings cable. Cello
Strings are stocked in lengths of 1, 2, 5, 8,
and 10 meters. Terminations are available
to suit the particular components of the
system. Custom lengths are available on
special order.
If it is necessary to convert Fischer
inputs to RCA, use the E3 adapters. The
best way to convert to single ended
operation is to use Cello Strings cable
(which has three conductors and a shield)
with Fischer male on one end and RCA
connector on the other. This preserves the
three-wire system from the amplifier to
the source unit and provides better
grounding and common-mode rejection.
To interface with XLR systems, it is
recommended that Cello Strings cable be
used with Fischer male on one end and
XLR female on the other end.
CUSTOM MADE CABLES
(NON-CELLO)
Three-conductor shielded cables should
be used to keep audio(+), audio(-), audio
ground and chassis earth separate.
If single-ended adapters are made, pins
one and three should be jumped and used
as ground, and pin two should be used as
the audio(+).
Connecting audio ground and chassis
ground may or may not cause or solve
grounding problems depending on the
system as a whole.
ELECTRICAL CONNECTIONS
Make sure the circuit breakers on the
1)
supplies are"off".
2)
Install the DC cables according to
the color codes using the DC cables
supplied.
3)
Install each terminal screw and tighten
until there is zero play, then apply an
additional 1/8th turn so that it is snug.
Be sure to keep the spade terminal
from rotating while turning the screw.
Do not over-tighten or you will break
the terminal strip.
4)
Install the terminal block covers.
Again, don't over- tighten.
5)
Verify that AC mains voltage is set
correctly.
6)
Connect the preamplifier or other
driving equipment.
7)
Connect speaker output cables.
8)
Be sure that the electrical service in the
building/house is up to the task,
especially if using two sets of bridged
amplifiers. The recommended ideal
situation is a dedicated line to each amp.
9)
Install AC cables into IEC mains
connector on rear of power supplies.
Connect AC cables to AC mains.
10)
NOTE: The power supply circuit
breaker will trip if the power supply is
not connected to the amplifier.
The Performance Amplifier can be used
as part of a complete Cello System, or in
conjunction with other speakers,
electronics, and cables.
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