B&K Reference 7270 User Manual

Reference 7270

series II

Seven Channel Amplifier

OWNER’S MANUAL

B & K Components Ltd.

P/N 13009 Rev.0102

B&K Components, Ltd 2100 Old Union Road Buffalo, New York 14227

P/N 13009 Rev.0102

TABLE OF CONTENTS

Safety Precautions page 2
Purpose and function page 3
Design and construction page 3
Features page 3
Rear panel view page 4
Rear panel description page 4
Level controls page 5
Inputs page 5 - 6
Outputs page 6
System installation page 7
Making the connection page 8
Control Muting page 9
Troubleshooting page 10
Care and cleaning page 10
Specifications page 11
Warranty page 12

Accessories included: Manual and Power cord

Page 1

P/N 13009 Rev.0102

SAFETY PRECAUTIONS

PLEASE READ BEFORE INSTALLING

WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE.

The lightning flash with an arrowhead, within an equilateral triangle, is intended to
alert the user of the presence of uninsulated “dangerous voltage
product’s enclosure that may be of a sufficient magnitude to constitute a risk of
electric shock to you.

The exclamation point within an equilateral triangle is intended to alert the user of
the presence of important operating and maintenance (servicing) instructions in
the literature accompanying the unit.

” within the

y Observance of polarity is essential. Double-check connections before turning the

amplifier on. The amplifier can be damaged if the unit is connected when its polarities
are incorrect.

y Damage can occur to your speakers if the power rating* of each individual driver is

exceeded by the amplifier. Make sure that all the drivers in your speaker system are
capable of handling not only the continuous power being delivered by the amplifier,
but the energy that is likely to be generated during strong and dynamic passages.

y Turn the amplifier ‘off’ before plugging in or unplugging the input and speaker

cables!!!

y The Reference 7270 series II is equipped with raised feet so that continuous

ventilation can be maintained. They also help to keep acoustic feedback into the
amplifier at a minimum. Additionally they provide a measure of protection against
scratching any surface the unit might be resting on. Do not alter or remove them.

y Do not stack anything on top of the amplifier (preamplifier, processor, source, etc.).
y Leave at least 2-3 inches clearance from the top of the amplifier to the next shelf,

component, etc., to insure proper ventilation.

* If you are at all unsure of what the speaker ‘ratings’ are, contact your dealer.

Page 2

P/N 13009 Rev.0102

THE REFERENCE 7270 SERIES II PURPOSE AND FUNCTION

The Reference 7270 series II is a high current, seven channel power amplifier. It is
designed to be used in all types of audio or audio/video systems.

DESIGN AND CONSTRUCTION

The Reference 7270 series II utilizes high quality electronic circuitry to achieve an
environment wherein a detailed, transparent, and highly musical sound can be realized.
The high quality parts complement includes; state-of-the-art solid state devices, 1% metal
film resistors, computer grade electrolytic power supply capacitors, and a high capacity
toroidal transformer.

The Reference 7270 series II operates with a class A predriver and AB high current
MOSFET power output stages. It is capable of reproducing the most demanding audio
signals at its rated power levels.

FEATURES

THX Ultra Certified

- The unit has passed a rigorous series of Lucasfilm THX quality and
performance tests and it is guaranteed that this amplifier will give superb performance for
years to come.

Toroidal Transformer

- Efficient, high current, shielded transformer that supplies the
amplifer with a clean and constant supply of power, even during highly demanding
source material passages.

Discrete Circuitry

- Dynamically provides a full, accurate, and three dimensional

reproduction of source material.

Class A Predriver

- Improves low level detail and clarity for smoother, more musical

sound.

AB MOSFET Output Stage

- Provides efficient and linear power delivery, as well as

protection from thermal overload.

Gold Plated Connectors

- Improved connections for better sound quality and minimized

signal loss and degradation.

1% Metal Film Resistors

- Higher quality resistors for lower noise, better sound, and a

greater degree of repeatability.

High Current

- Ability to cleanly, accurately, and reliably reproduce demanding

recordings or source materials into low impedance drivers and speaker systems.

Computer Grade Capacitors

- Large capacity computer grade electrolytic capacitors for

extended low frequency control, increased power supply, and improved dynamics.

Fused Outputs ­Heavy Duty Gold Binding Posts

Provides limited protection from accidental shorting of amplifier outputs.

- Improved current carrying capacity and sound quality

Page 3

P/N 13009 Rev.0102