Kef Model One Owners Manual

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CONTENTS LIST

1.0

2.0

3.0

4.0

Introduction

1.1 Overview of Common Features
1.2 Model One

1.3 Model Two

1.4 Model Three

1.5 Model Four

1.6 Input Terminals

1.7 Magnetic Shielding

Installation

21 Unpacking, Handling and Aftercare

2.2 Speaker Placement and Floom Acoustics
2.3 Adjusting the Feet and/or Spikes

2.4 Speaker Cables

2.5 Amplifier to Speaker Connections

2.6 Bi-wiring/Bi-amping Terminals

2.7 Speaker Phasing

2.8 Grilles

2.9 Amplifier Requirements and Power Handling

Warranty
3.1 Service Information

Technical Specifications

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Thank you for purchasing KEF Reference Series loudspeakers. These have been
designed to faithfully reproduce high quality sound over many years of use and
should provide realistic reproduction of music and speech. Please take a little
time to read these instructions prior to use.

1.0

1.1

INTRODUCTION

Since its formation in 1961, KEF has pioneered many innovations in
loudspeaker technology and design. Your new Reference Series loudspeakers
contain one of the latest of these advances - the KEF Uni-Q ® Driver.

In this innovative KEF design, not only are the mid- and high-frequency drivers
on the same axis (co-axial), but their acoustic centres are also in the same
plane (co-planar). The profile of the mid-frequency driver's cone modifies the
directivity factor (or 0) of the high frequency unit such that both drive units
have the same directivity in the critical crossover region, where both drive units
are operating at similar frequencies. This unification of the Q' of the drive units
lies behind the name Uni-Q".

Now incorporated in many KEF loudspeakers, the Uni-Q driver yields immediate
and readily audible sonic benefits. With no sharp discontinuity in Q at the
crossover frequency, correct tonal balance is not confined to a single sweet
spot in the listening room and is extended to cover a far broader area. With
sound arriving in phase, the sound source is brought into the sharpest possible
focus. With properly recorded material and as part of a good quality system, well
set-up, loudspeakers with KEF Uni-Q can reveal the location of each musical
voice in the stereo image with pin-point accuracy and with a much smoother
response being maintained off-axis - where most people listen - than before.

Overview of Common Features

The KEF Reference Series products covered by this manual are floorstanding
loudspeakers designed to operate away from room boundaries. All use
Reference matched drive units and crossovers that have been manufactured to
laboratory-standard and rigorously tested at every stage of production. The
driver complement of each system reflects the increasing performance
capabilities of each model, particularly its ability to reproduce increased levels of
low frequency and high-dynamic mid-frequency output.

On all these models, mid- and high-frequencies are reproduced by a single Uni-Q
driver incorporating a 160 mm (6 1I2") mid-frequency drive unit and a 25 mm (1")
fluid cooled, soft-dome, high-frequency unit. These State-of-the-Art components
are common to all models on the grounds that clarity and definition of high and
mid-frequencies are paramount in a Reference Standard product. The ultimate
levels of dynamic range, bass output and maximum sound pressure level
available decides which other combination of drive units are used.

Thanks to their internal Magnetic Shielding. these loudspeakers may be used
close-to or beside a television set or Video Monitor, when used in front left and
right channel positions in Home Theatre or Surround Sound applications.

All models employ front baffles moulded from mineral-filled polymer which
conceals the fixings for the drive units. The front baffle also incorporates a
smoothly contoured bass-vent through which low frequencies, from the Coupled
Cavity chamber, pass.