MK Sound V-125, MX-125, V-75, VX-7 User Manual

operation
manual

MX-SERIES: MX-300, MX-200,

MX-125 Mk II,
MX-105, MX-70B

V-SERIES: V-125, V-75 Mk II, VX-7 Mk II

powered subwoofers

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

© 1997 Miller & Kreisel Sound Corp.

page 2powered subwoofers

TABLE OF CONTENTS

1. SAFETY INSTRUCTIONS................................................................................3

2. INTRODUCTION........................................................................................4

3. WHERE TO LOCA TE YOUR SUBWOOFER....................................................4

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

ST AND ARD AMPLIFIER/SPEAKER WIRE CONNECTIONS........................................5

SATELLITE SPEAKER WIRING OPTION 1...............................................................6

MX-105, MX-70B, V-125, V-75 Mk II, VX-7B SPEAKER-LEVEL HIGH-PASS FILTER........6

SATELLITE SPEAKER WIRING OPTION 2...............................................................6

WIRING WITH THE RCA JACK INPUTS..........................................................................8

WIRING WITH THE M&K HP-80 OR VF-80 ELECTRONIC HIGH-P ASS FIL TERS..............9

PLUGGING IN THE SUBWOOFER..........................................................................9

5. SA TELLITE/SUBWOOFER PHASING TEST ..................................................10

6. USE OF THE "LOW P ASS FIL TER" CONTROL...............................................11

7. USE OF THE "BYP ASS SWITCH (MX-125 Mk II ONL Y)...................................11

8. USING TWO SUBWOOFERS.........................................................................11

9. FINE-TUNING SUBWOOFER PLACEMENT ..................................................11

10. HOME THEA TRE USAGE...............................................................................12

CONNECTING TO A SURROUND SOUND RECEIVER OR PROCESSOR.......................12

11. SPECIAL INST ALLA TION NOTES..................................................................13

12. TROUBLESHOOTING..............................................................................14

REPLACEMENT FUSE VALUES...........................................................................16

13. IF YOU NEED SERVICE..................................................................................16

WIRING DIAGRAMS

FIGURE 1 TO AN AMPLIFIER USING SPEAKER WIRES.................................5

FIGURE 2 SATELLITE SPEAKER WIRING OPTION 1......................................7

FIGURE 3 SATELLITE SPEAKER WIRING OPTION 2......................................7

FIGURE 4 USING THE PREAMP INPUTS (RCA JACKS)..................................8

page 3powered subwoofers

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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

TO PREVENT THE RISK OF ELECTRIC

CAUTION:

SHOCK, DO NOT REMOVE COVER (OR
BACK). NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO

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 appliance.

QUALIFIED SERVICE PERSONNEL.

1. SAFETY INSTRUCTIONS

1. READ INSTRUCTIONS - All safety and operating instructions should be read before this product is operated.

2. RETAIN INSTRUCTIONS - The safety and operating instructions should be retained for future reference.

3. HEED WARNINGS - All warnings on this product and in the operating instructions should be adhered to.

4. FOLLOW INSTRUCTIONS - All operating and use instructions should be followed.

5. ATTACHMENTS - Do not use attachments not recommended by the product manufacturer as they may cause hazards.

6. WATER AND MOISTURE - Do not use this product near water - for example, near a bath tub, wash bowl, kitchen sink, or
laundry tub; in a wet basement; or near a swimming pool; and the like.

7. ACCESSORIES - Do not place this product on an unstable cart, stand, tripod, bracket, or table. The product may fall, causing
serious injury to a child or adult, and serious damage to the product. Use only with accessories recommended by the
manufacturer, or sold with the product. Any mounting of the product should follow the manufacturer's instructions and should
use a mounting accessory recommended by the manufacturer.

8. POWER SOURCE - This product should be operated only from the type of power source indicated on the marking label. If
you are unsure of the type of power supply to your home, consult your product dealer or local power company.

9. OVERLOADING - Do not overload wall outlets or extension cords as this can result in a risk of fire or electric shock.

10. LIQUID ENTRY - Never spill any liquid of any kind on the product.

11. SERVICING - Do not attempt to service this product yourself as opening or removing covers, including those over bottom or
side speaker drivers, may expose you to dangerous voltage or other hazards. Refer all service to qualified service personnel.

12. DAMAGE REQUIRING SERVICE - Unplug this product from the wall outlet and refer servicing to qualified personnel under
the following conditions:

a. When the power-supply cord or plug is damaged.
b. If liquid has been spilled, or objects have fallen into this product.
c. If the product does not operate normally by following the operating instructions. Adjust only controls that are covered

by the operating instructions as an improper adjustment of other controls may result in damage and will often require

extensive work by a qualified technician to restore the product to its normal operation.
d. If the product has been dropped or damaged in any way.
e. When the product exhibits a distinct change in performance - this indicates a need for service.

13. REPLACEMENT PARTS - When replacement parts are required, be sure the service technician has used replacement parts
specified by the manufacturer or have the same characteristics as the original part. Unauthorized substitutions may result
in risk of fire, electric shock, or other hazard.

14. SAFETY CHECK - Upon completion of any service or repairs to this product, ask the service technician to perform safety
checks to determine that the product is in proper operating condition.

15. HEAT - This product should be situated away from heat sources such as radiators, heat registers, stoves, or other products
(including amplifiers) that produce heat.

page 4powered subwoofers

2. INTRODUCTION

Congratulations! You have just made perhaps the most exciting and dramatic addition that you
could make to your audio or audio/video system. The new dimension of deep and powerful bass
provided by your M&K Deep Bass Powered Subwoofer will thrill and excite you.

We encourage you to read this owner's manual, as there is a great deal of information provided
here to help you get the best possible performance. This manual gives you basic hook-up instructions
first, followed by more detailed technical, installation, and service information.

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

3. WHERE TO LOCATE YOUR SUBWOOFER

M&K Subwoofers will perform well in just about any room location. In fact, unless your ear is within
a couple feet of the Subwoofer, the deep bass will seem to come exclusively from your Satellite
speakers. (By Satellite speakers, we mean the main speakers used with your Subwoofer). There is
no need to place your Subwoofer between the Satellite speakers or in any specific location in the room.

Except for the V-125, M&K Subwoofers are not magnetically shielded. Leave 2 - 3 feet of
clearance around any television set. This shielding avoids magnetization of the shadow mask of the
television's picture tube, which will distort the television's picture. If this ever happens to your set, turn
it off and on a few times to use the set's built-in degaussing circuitry. If the problem persists, contact
a TV technician and ask him or her to use an external degaussing coil.

No matter where you put the Subwoofer, you must allow room for ventilation of its heatsink and
backplate. The Subwoofer's power amplifier is mounted on the backplate, and it generates heat.

1. Do not place the Subwoofer against a wall. Leave at least one foot

clearance around the heatsink.

2. Do not place the Subwoofer near baseboard heaters or forced air heating outlets.

3. Do not use the Subwoofer outdoors or in a humid environment.
For more detailed placement information, please see Section 8, on page 12.

Do not plug the Subwoofer into an AC outlet until all system wiring is complete.

4. SUBWOOFER HOOK-UP

There are two different ways to connect the Subwoofer to your system. One uses speaker wire,
and the other uses interconnect cable with RCA-type jacks.

Read this section before deciding which is best for your system.

Look at the back panel of the Subwoofer. You will see two RCA input jacks labelled "INPUT" and
two sets of speaker wire input terminals labelled "FROM AMPLIFIER" and "TO SPEAKERS." You
must choose to use either the speaker wire inputs or the RCA jack inputs.

page 5powered subwoofers

STANDARD AMPLIFIER/SPEAKER WIRE CONNECTIONS

Many M&K subwoofer owners hook up their Subwoofer by connecting it to their receiver or
amplifier using speaker wires. To do so, you make the same kind of connections that you would use
for your Satellite (or main) speakers, except that both the left and right channels go to the Subwoofer.
(If you are using two Subwoofers, connect one channel only to each Subwoofer).

NOTE: You cannot connect the MX-125 Mk II using speaker wires. If you have to connect an
MX-125 Mk II to an amplifier or receiver does not have RCA outputs, please contact your dealer or the
M&K factory. We offer an optional RM-2 High Level to Low Level convertor with Remote Volume
Control, which will allow you to drive the MX-125 Mk II with speaker-level amplifier outputs.

1. Run speaker wire between the Amplifier's Left channel output terminals and the
Subwoofer's Left channel "FROM AMPLIFIER" terminals.

a. Connect the Amplifier's Left channel Positive (+) terminal and the Subwoofer's

Left RED (+) "FROM AMPLIFIER" terminal.

b. Connect the Amplifier's Left channel Negative ( — ) terminal and the Subwoofer's

Left BLACK ( — ) "FROM AMPLIFIER" terminal.

2. Make matching connections for the Right channel. See Figure 1.

FIGURE 1 - TO AN AMPLIFIER USING SPEAKER WIRES

LEFT/MONO

+



PHASE

AVIS:

DEBRANCHER AVANT DE
REMPLACER LE FUSIBLE.

DE RECHANGE DE MEME TYPE.

FROM PREAMP

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR.

ATTENTION:

UTILIZER UN FUSIBLE

DISCONNECT SUPPLY CORD

BEFORE CHANGING FUSE.

L

R

AMPLIFIER OR RECEIVER

This option is not available
with the MX-125 Mk II

LOW PASS FILTER

75

(Hz)

60

100

50

125

LEFT

FROM AMPLIFIER

RIGHT

RIGHT

TO SPEAKERS

LEFT

Made in U.S.A.

MILLER & KREISEL SOUND CORPORATION

10391 Jefferson Blvd, Culver City, CA 90232 310/204-2854

RIGHT

CAUTION:

REPLACE FUSE ONLY

WITH SAME TYPE.

120 VAC 50/60 Hz

BASS LEVEL

MIN

MAX

4 AMP

T

SLOW-BLOW

IMPORTANT NOTE FOR DOLBY SURROUND SOUND SYSTEMS:

When the Subwoofer is connected to the Left and Right amplifier outputs, and the controller is in
Pro-Logic mode, the Center channel WIDE/NORMAL switch MUST be set to the NORMAL mode. If
the switch is set to the WIDE mode, the bass content of the Center channel will not be fed to the
Subwoofer, and a significant amount of bass in the program material will not be reproduced.