Concept 4 5d owners manual

Page 2

Introduction

Thank you for choosmg Concept.
We think youll appreCiate this product
most if you understand its design
philosophy. Take a few minutes and
read this manual before you set up
your new receiver. It will save you time
and will help you get top performance.

The Concept 4.5D continues the
Concept tradition: stereo receivers
without compromise Every detail, from
the action of the controls to the size of
the internal heat sinks, has been
carefully crafted by a distinguished
international team of designers and
production engineers. Concept
receivers combine performance of
laboratory standards with bold visual
definition. But above all else. your new
Concept is a fine instrument for the
discerning audiophile.

A number of design innovations
make the Concept 4.5D a truly
remarkable instrument, A digital
frequency display makes precise
tuning easy. Excellent AM and FM
reception is assured by the tuner
assembly which features a full
quadrature detector, hand-picked filter
elements and the latest phase-locked
loop circuitry.

The Concept 4.5D power amplifier
section incorporates single strata
voltage amplifier devices and rugged,
high-speed output transistors. The
result is a Carefully stabilized high-
speed configuration that can amplify
rapidly changing audio Signals while
producing the lowest possible
distortion.

The hallmark of the Concept 4.5D
is a standard of accuracy unmarred by
audible distortion. This has been
achieved by selecting only premium-
quality parts and operating them far
below their capabilities. The result is
consistent performance for years of
trouble-free service,

A Note on High-Powered Receivers

The high power output capability
of your Concept receiver Will enable
you to hear undistorted musical peaks,
and bring fresh clarity and detail to
your music. There are, however, a few
things you should keep in mind
regarding high power capacity and
what it can do.

Concepts amplifier is direct-
coupled, with no capacitors or filters
between the output transistors and the
speakers. Sound is passed directly to
the speakers, no matter how low the
frequency. Thus, any sonic
deficiencies in your other components
will become very apparent. For this
reason, you should use only the
highest quality equipment with your
new Concept

You should be especially careful
when using your record player.
Dropping the tonearm on the record, or
flicking dust from the stylus, with the
volume up, can send a power surge
that may damage your speakers, Its
also a good practice to turn the volume
down whenever youre changing a
record.

Check the powerehandling
capacity of your speakers; if its low.
you might want to fuse them, Your
Concept dealer can give you advice.
Prolonged operation at very high
volume levels can also cause
excessive heat to build up in the voice
coils of your speakers, shortening their
lifespan This is particularly true of the
relatively inefficient. acoustic-
suspension, book-shelf type speakers
Sonically, this type of speaker benefits
most from the high power afforded by
your new Concept. but prolonged
overdriving can lead to premature
speaker failure.

Unpacking

Save the shipping carton and all
packing materials. Theyll keep your
receiver safe should you ever move or
ship it.

Record the serial number and
purchase date in the space provided
here, This information will be needed it
your receiver should require warranty
service or is stolen.

SERIAL NUMBER:
DATE OF PURCHASE:

Placement

You should, of course. place your
receiver where its most convenient.
However, keep it away from direct
sunlight or any other heat source. Be
sure not to block the vents on the
bottom. top, or back of the unit Also,
as the Concept 4,50 weighs 30
pounds, you should be sure its on a
sturdy shelf.

CA UT/ON: To prevent fire and to
avoid shock hazard, do not expose the
receiver to rain or moisture,