KLH 12 Owners manual

INSTRUCTIONS

KLH RESEARCH AND DEVELOPMENT CORP.
30 CROSS STREET, CAMBRIDGE, MASS. 02139

[phone]

,,

KLH*

system that aims at the highest level of performance.

The

MODEL

KLI-I

TWELVE ACOUSTIC-SUSPENSION LOUDSPEAKER SYSTEM

Model Twelve

is

a full-range, moving-coil loudspeaker

In addition

to providing exceptionally smooth and wide frequency coverage with

notably low distortion,

it

offers the listener an unprecedented
opportunity to make subtle adjustments of overall sound quality to
account for differences in program material, associated equipment,

room acoustics, and personal musical judgments.

The unique Contour Control provided with the Model Twelve

designed to be placed where you can use

it

most conveniently and

effectively to judge and adjust sound quality.

It

will

be of

is

greatest usefulness, particularly for adjusting very-high-frequency

response
can keep

suit the quality of varied program material, if you

to

it

within easy reach of your favorite chair.

If this

is

not feasible, we suggest that you take time to experiment with

adjustments of musical balance from your usual listening location

before you place the Contour Control elsewhere.

Connection To Amplifier

is

designed to be connected to an amplifier

You should not attempt to

only

The Model Twelve
by

way of

its

Contour Control.
connect an amplifier directly to any of the four terminals on the
rear of the loudspeaker cabinet. Severe damaqe may result.

The terminals marked

"GND"

and

"8

OHMS" on the Contour Control's
rear panel should be connected to the corresponding speaker terminals
on your amplifier.

cable

run of up to sixty feet.

Use

ordinary two-conductor "lamp cord" for a

For a run of thirty feet or

less,

you may use the lighter-gauge speaker wire often provided by audio

dealers.

Connection of Contour Control to Loudspeaker

i.

Two lengths of thin, four-conductor cable are provided for

in

your convenience

connecting the Contour Control to the Model Twelve.

If you want to place the control box out of sight on the rear of

the speaker cabinet after making initial adjustments with
the short cable

The long (40-foot) cable

will

avoid an excess of wire behind the cabinet.

is

for permanent or temporary use of the

it,

control box in a remote position.

The

four lugs at either end of both cables are color-coded
to correspond to the terminals on the rear of the speaker cabinet
and the Contour Control. Terminal

"C"

White, and

"DM

Yellow. In the event that the color-coding

"A"

is

coded Black, "B" Red,

is
ever removed from the cables, or if you wish to splice the cable
and re-establish the proper coding, one of the wires
color under

wire

is

sequence

Make sure to connect the four

the

(BCD:

its

insulation, the other three copper. The silver

"A"

wire, coded Black,

a=

the others follow in

Red, White, Yellow) across the cable.

wires

in the cable to the proper

is

silver in

terminals at speaker and control box. If you have reason to doubt
that the wires are connected in correct sequence, listen to the

Model Twelve at low volume levels until you are sure that the low-

frequency output from the Contour Control

hiqh-frequency speaker, which could

levels by such

a

misconnection.

be

is

not connected to the

damaqed at normal listeninq

Usinq The Contour Control

The frequency ranges covered by the four switches on the Model
Twelve's Contour Control are those that effectively determine the
octave-to-octave musical balance of any loudspeaker. The final
choice of the relative balance of any of these ranges
open to some question,
in reproduced sound, the more likely he

and the more serious the listener's interest

is

to notice these choices

is

always

(whether or not he can identify them as such) and judge them against

his own listening requirements. We at

KLH

feel that the final

useful step in the design of an ambitious, "perfectionist" loudspeaker

system

is

to open these areas of choice to a meaningful degree to

the listener.

Although you may first believe otherwise, there are no easy
labels (such as "presence" or "brilliance") for the ranges covered

by the four adjustments, and there

musical effect. We suggest that you begin by tuning an

is

no easy description of their

FM

tuner
to the random noise between stations and listening to the effect
that various switch positions on the Contour Control have on the