Miller & Kreisel Sound LCR-750THX, Center-750THX Operation Manual

operation manual

LCR-750THX
Center-750THX

Miller & Kreisel Sound Corporation
10391 Jefferson Boulevard
Culver City, CA 90232 USA
[phone] FAX [phone]
www.mksound.com

© 1999 MILLER & KREISEL SOUND CORP.

THX Select Front Speakers

Manufactured under license from Lucasfilm Ltd. U.S.
Patent Numbers 5,043,970; 5,189,703; and 5,222,059. For­eign patents pending. Lucasfilm and THX are registered
trademarks of Lucasfilm Ltd.

LCR-750THX & Center-750THX

page 2

T ABLE OF CONTENTS

1. INTRODUCTION...........................................................................................................3

2. THE HOME THX AUDIO SYSTEM..........................................................................3

3. PLACEMENT OF YOUR M&K THX SPEAKERS................................................................3

4. SPEAKER HOOK-UP & USAGE.............................................................................4

HOOK-UP...........................................................................................................................4

5. THE M&K HIGH-FREQUENCY PRISM SYSTEM...........................................................5

6. CENTER-750THX CENTER CHANNEL..................................................................................5

7. OPTIMIZING SPEAKER PLACEMENT...............................................................................5

8. HOME THEATRE USAGE...................................................................................................6

CENTER CHANNEL.......................................................................................................7

9. SATELLITE/SUBWOOFER PHASING TEST....................................................................8

10. SPEAKER DAMAGE & HOW TO AVOID IT.......................................................................9

11. BI - AMPLIFYING YOUR SPEAKERS WITH M&K HIGH-PASS FILTERS.........................9

12. IF YOU NEED SERVICE OR SET-UP ASSISTANCE.....................................................10

13. CABINET MAINTENANCE................................................................................................10

14. USE WITH M&K STANDS AND OMNIMOUNT BRACKETS...............................................10

15. SPECIFICATIONS.......................................................................................................11

DIAGRAMS

FIGURE 1 SPEAKER WIRING..................................................................................4

FIGURE 2 SEPARATION BETWEEN LEFT & RIGHT SPEAKERS............................6

LCR-750THX & Center-750THX

page 3

1. INTRODUCTION

Congratulations! Your new M&K THX Select speaker system will give you years of unmatched enjoyment and

excitement while listening to your favorite musical and audio/video sources.

We encourage you to read this owner’s manual, as there is a great deal of information provided here to help you

achieve the best possible performance.

If you have any questions about your speaker system, please contact your M&K dealer or call the M&K factory
directly at [phone], from 8:30 AM to 5:00 PM Pacific Time, Monday through Friday. We will be happy to help
you with any question, no matter how simple or complex it may be.

This manual gives you basic hook-up instructions first, followed by more detailed technical, installation, and
service information.

2. THE HOME THX AUDIO SPEAKER SYSTEM

Your choice of an M&K Home THX Audio speaker system assures you of achieving the state of the art in
home theatre music and video reproduction. The precise and exacting standards developed by Lucasfilm's Home
THX division, as applied by M&K's engineering team, assure that you will hear every element of film sound - from
the softest brush of an object against an actor's clothing to the awesome impact of effects such as an exploding
planet - with the same sonic quality heard by the film's director and sound designer as they created the final mix
of sound on the studio's dubbing stage.

To do this in a home environment requires different equipment and standards than are found in a THX motion
picture theatre. The standards developed for Home THX Audio are critically important to achieving the following
performance attributes:

- wide frequency range, extending to the limits of audibility

- smooth, naturally balanced overall sound

- excellent dialog intelligibility

- wide dynamic range with extremely low distortion

- well-matched timbre (tonal balance) between front speakers and surrounds

- precise localization of specific sounds (as in special effects)

- envelopment by ambient soundfield (without any localization of individual speakers to distract
from the action on-screen

- superb performance with musical sources

The unsurpassed quality of your M&K Home THX Audio speaker system means that all of the excitement
and emotional involvement of films and music will be brought to life in your home. Turn down the lights, and let
the experience begin!

3. PLACEMENT OF YOUR M&K THX SPEAKERS

Your speakers can be installed in a wide variety of locations. They can be placed on stands, shelves, or
bookcases, or permanently mounted using brackets, direct wall attachment, or a ceiling suspension system.

Your speakers have threaded mounting hardware permanently mounted into the cabinet in different
locations on the speaker's back baffle. These allow you to mount the speakers in a wide variety of locations, and
to orient them for the best possible sound. There is a two hole pattern using inserts threaded for 1/4 - 20 hardware
(1/4 inch in diameter, and 20 threads per inch), and a single 3/8" threaded insert.

These mounting patterns accommodate M&K speaker stands and mounting brackets. These mounting
holes can also be used to attach the speakers to Omnimount brackets. They match the Omnimount #75 pattern
and the Omnimount RST-53 3/8" mount).

You can place your speakers virtually anywhere in the room, but certain locations are better than others.
In general, locate them away from obstructions that would interfere with the direct path from the speakers to your
ears (such as walls, furniture, lighting, plants, etc.). They will sound better when they are around ear height, or
when angled towards your favorite listening location.

LCR-750THX & Center-750THX

page 4

FIGURE 1

SPEAKER WIRING

_

+

_

LEFT

+

_

RIGHT

_

+

+

AMPLIFIER

Both the LCR-750 and Center-750 are magnetically shielded. This means that they can be placed close to
a television monitor without distorting the picture. If you place the speaker directly on top of a large screen direct­view monitor, there is some slight possibility of picture distortion. If that occurs, you may need to move the
speaker a few inches or to separate the speaker from the television by a similar distance. Call the factory if you
have problems.

For more detailed placement information, see Section 6 on page 5.

The sound quality that you get from your speakers can be affected by the type of speaker wire that you use
to connect them. While it is possible to use speaker wire as thin as 22 gauge to hook your speakers up, wire of
less than 16 gauge will compromise their sound quality. We strongly recommend using the heaviest gauge wire
possible. Your special M&K 5-way binding post input terminals will directly accept wire as heavy as 4 gauge!

For wire runs of up to 10 feet, 16 gauge wire is acceptable. For runs up to 20 feet, you should use a minimum
of 14 gauge. For up to 30 feet, use a minimum of 12 gauge, and over 30 feet should use 10 gauge. See the THX
Installation and Operation Manual for more information.

There are a very wide variety of premium speaker cables available from a number of specialist manufac­turers. We do not endorse any specific brand of premium cable, but we do recommend the highest quality cable
that fits your budget. Beware, though — w ith cables, expensive is not always better. If you have any questions,
contact your M&K Home THX dealer for advice.

The Positive ( + ) lead from your amplifier or receiver should be connected to the RED ( + ) "INPUT" terminal,
and the Negative ( — ) lead from your amplifier or receiver should be connected to the BLACK ( — ) "INPUT"
terminal. See Figure 1 above.

4. SPEAKER HOOK-UP

WIRING