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THX subwoofers

2. INTRODUCTION

Congratulations!  Your new M&K THX

®

 subwoofer truly represents the state-of-the-art in subwoofer

performance.  The new dimension of deep and powerful bass it provides will both thrill and excite you.

We strongly 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.

If you have any questions about your subwoofer, please contact your M&K Home THX

 

Audio dealer,

or call the M&K factory directly at (310) 204-2854, 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.

For more details on the installation and calibration of your Home THX Audio system, please refer

to the THX Installation & Operation Manual.

THIS OWNER'S MANUAL HAS TWO SETS OF SET-UP INSTRUCTIONS.

ONE SET IS FOR USING THE SUBWOOFER WITH A THX CONTROLLER.

THE OTHER SET IS FOR USE WITH NON-THX PROCESSORS.

To operate it with a THX controller, see Section 4 below.

To use it with a non-THX controller, see Section 6 (page 7).

3. WHERE TO  PLACE YOUR  SUBWOOFER

Your subwoofer will deliver excellent performance located virtually anywhere in your room.  Unless

you are next to the subwoofer, you will not hear it as a separate source of sound.  In fact, its deep bass
will appear to come from your other speakers.  Therefore, there is no 

need to place your subwoofer

either between your Satellite or L/C/R speakers or in any specific location in the room.

You can significantly improve and fine-tune your subwoofer's performance by experimenting with

its placement in the room.  For more detailed placement information, please see Section 8 (page 12).

Your subwoofer is magnetically shielded, so you can locate it close to a television without picture

distortion occurring from magnetic deflection of the TV's electron beam.

Wherever 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.  Therefore:

1.   Do not place the subwoofer against a wall.  Leave at least 3 inches clearance for the heatsink.
2. Do not place the subwoofer close to baseboard heaters or forced air heating outlets.

DO NOT PLUG THE SUBWOOFER INTO AN AC OUTLET

UNTIL ALL SYSTEM WIRING IS COMPLETE

4. OPERATION WITH THX COMPONENTS

CONNECTING THE SUBWOOFER TO A THX CONTROLLER

The "INPUT" RCA terminals on the subwoofer connect it to the outputs of your THX controller.  All

of the input connections and controls for the subwoofer are located on its large metal backplate, which
can be found on the back panel of the subwoofer cabinet.

To connect the subwoofer, run a shielded RCA - RCA interconnect cable from the SUBWOOFER

Summary of Contents for MX-150THX, V-125THX

Page 1: ...fferson Boulevard Culver City CA 90232 USA 310 204 2854 FAX 310 202 8782 1995 MILLER KREISEL SOUND CORP operation manual MX SERIES MX 150THX V SERIES V 125THX Manufactured under license from Lucasfilm Ltd Lucasfilm and THX are registered trademarks of Lucasfilm Ltd ...

Page 2: ...80 OR VF 80 HIGH PASS FILTERS 10 TESTING THE SUBWOOFER NON THX 10 SETTING SUBWOOFER LEVEL NON THX 11 USING TWO SUBWOOFERS NON THX 11 7 SATELLITE SUBWOOFER PHASING TEST 11 8 FINE TUNING THE PLACEMENT OF YOUR SUBWOOFER 12 SPECIAL METHOD FOR PLACING THE SUBWOOFER 13 9 USE OF SPIKED FEET WITH MX SUBWOOFERS 14 10 TROUBLESHOOTING 14 IF YOU NEED TO REPLACE THE EXTERNAL FUSE 15 11 IF YOU NEED SERVICE 16 1...

Page 3: ...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 Opening or removing covers including any over bottom or side speaker drivers may expose you to dangerous voltage or other hazards Refer all se...

Page 4: ... separate source of sound In fact its deep bass will appear to come from your other speakers Therefore there is no need to place your subwoofer either between your Satellite or L C R speakers or in any specific location in the room You can significantly improve and fine tune your subwoofer s performance by experimenting with its placement in the room For more detailed placement information please ...

Page 5: ...EMPLACER LE FUSIBLE UTILIZER UN FUSIBLE DE RECHANGE DE MEME TYPE CAUTION DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE REPLACE FUSE ONLY WITH SAME TYPE CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Manufactured under license from Lucasfilm Ltd Lucasfilm and THX are registered trademarks of Lucasfilm Ltd THX CONTROLLER SUBWOOFER OUT 10391 Jefferson Blvd Culve...

Page 6: ...NT IT CAN DRAW UP TO 400 WATTS FROM THE AC LINE IT MUST BE PLUGGED INTO A SOLID AC LINE 5 CALIBRATING THE SUBWOOFER THX On the back panel of the subwoofer three toggle switches allow you to select various modes of operation Two are described here A description of the function of the third toggle switch can be found in section 7 SATELLITE SUBWOOFER PHASING TEST page 11 OPERATION OF THE LOW PASS FIL...

Page 7: ...the V 125THX subwoofer you must use two in your system to meet THX requirements If you have the MX 150THX only one is required to meet THX specifications Using two subwoofers in your THX system will give you the ultimate in bass performance It will give you improved bass impact and definition as well as greater output and dynamic range If you locate the subwoofers in different parts of the room yo...

Page 8: ...E DE MEME TYPE CAUTION DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE REPLACE FUSE ONLY WITH SAME TYPE CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Manufactured under license from Lucasfilm Ltd Lucasfilm and THX are registered trademarks of Lucasfilm Ltd 10391 Jefferson Blvd Culver City CA 90232 310 204 2854 MILLER KREISEL SOUND CORPORATION RIGHT Made in U S...

Page 9: ...T MONO INPUT REFERENCE 80 Hz 24 dB OCTAVE THX VARIABLE PHASE THX LOW PASS FILTER 3 dB 6 dB BASS LEVEL RIGHT LEFT MONO INPUT REFERENCE 80 Hz 24 dB OCTAVE THX VARIABLE PHASE THX LOW PASS FILTER 3 dB 6 dB BASS LEVEL 10391 Jefferson Blvd Culver City CA 90232 310 204 2854 MILLER KREISEL SOUND CORPORATION Made in U S A T 4 AMP 120 VAC 50 60 Hz SLOW BLOW ATTENTION DEBRANCHER AVANT DE REMPLACER LE FUSIBLE...

Page 10: ...atellites the combination forms a 4th order Linkwitz Riley crossover between satellite and subwoofer The linear phase of this crossover means uncompromised performance with great flexibility in system setup without requiring elaborate calibrations or adjustments Do not use either of these filters with a THX controller The THX controller has the appropriate filters in its built in crossover circuit...

Page 11: ...el but the virtually all non THX processors do not If you do have such a surround sound processor see SETTING SUBWOOFER LEVEL THX on page 7 In any case remember that you can always deliberately set the level higher if you want more bass or lower if you don t want to disturb your neighbors USING TWO SUBWOOFERS NON THX Using two subwoofers in your audio video system will give you the ultimate in bas...

Page 12: ...t was set to the position set it to the position The best way is to have a partner work the switch while you sit in the main listening position and listen Now listen to the same wideband pink noise or look at the spectrum analyzer output in the mid bass region If you hear measure less bass set the SUBWOOFER PHASE switch to the opposite position If you hear measure more bass leave the switch alone ...

Page 13: ...oom listening to how the sound quality changes from location to location As you listen concentrate on the quality of the bass in the parts of the room where you could place the subwoofer The location where you hear the best combination of a smooth response exciting deep bass impact and sock with the least boominess should be the best place to locate the subwoofer Move the subwoofer to that locatio...

Page 14: ...you must replace it with the correct value to avoid fire hazards and to maintain the warranty 1 If your subwoofer has no output a Make sure that the subwoofer is plugged into an AC outlet b If the BASS LEVEL switch is set to VARIABLE make sure that the BASS LEVEL control is set above the MIN position Rotate it clockwise if it is set to the MIN position Make sure that the SUBWOOFER OUTPUT level con...

Page 15: ...em is in another component or a ground loop For ground loop problems when the subwoofer is plugged into a separate AC outlet try plugging it into the same outlet as your amplifier or receiver If that doesn t work reverse the polarity of its AC plug If you cannot solve the problem call M K or your dealer 5 If you hear an unusual sound from the subwoofer when no signal or music is playing Try removi...

Page 16: ...l purchase It does not cover abuse misuse repairs by unauthorized service stations speakers without serial numbers and damage in shipping or by accident If you have questions about the warranty please contact M K or your dealer SAVE ALL OF YOUR SUBWOOFER PACKING MATERIAL YOU MUST USE IT ANY TIME YOU SHIP YOUR UNIT 12 SPECIFICATIONS MX 150THX V 125THX POWER OUTPUT 150 watts RMS 125 watts RMS AMPLIF...

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