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MK Sound MX-150THX, V-125THX manual

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Table of contents for the manual

  • Page 1

    THX ® powered subwoofers Miller & Kreisel Sound Corporation 10391 Jefferson Boulevard Culver City, CA 90232 USA (310) 204-2854 FAX (310) 202-8782 © 1995 MILLER & KREISEL SOUND CORP. operation manual MX-SERIES: MX-150 THX V -SERIES: V -125 THX Manufactured under license from Lucasfilm Ltd. Lucasfilm and THX are registered trademarks of Luc[...]

  • Page 2

    page 2 THX subwoofers T ABLE OF CONTENTS 1. SAFETY INSTRUCTIONS ................................................................................................ 3 2. INTRODUCTION .............................................................................................................. 4 3. WHERE TO PLACE YOUR SUBWOOFER .........................[...]

  • Page 3

    THX subwoofers page 3 The exclamation point within an equi- lateral triangle is intended to alert the user of the presence of important op- erating and maintenance (servicing) instructions in the literature accom- panying the appliance. The lightning flash with arrowhead, within an equilateral triangle, is in- tended to alert the user of the pres- [...]

  • Page 4

    page 4 THX subwoofers 2. INTR ODUCTION 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 provide[...]

  • Page 5

    THX subwoofers page 5 OUTPUT jack on your THX controller to the "LEFT/MONO" "INPUT" jack on the subwoofer's backplate. See Figure 1 below. Some THX controllers have a pair of stereo subwoofer outputs, while others have a single mono output. Your subwoofer is compatible with both types. If your THX controller has stereo subw[...]

  • Page 6

    page 6 THX subwoofers TESTING THE SUBWOOFER (THX MODE) Once all of the interconnect cables are in place, you are just about ready to plug in the subwoofer. Set the "LOW PASS FILTER" toggle switch to the "THX" position and the "BASS LEVEL" toggle switch to the "THX" position. Set the "SUBWOOFER PHASE"[...]

  • Page 7

    THX subwoofers page 7 For the V-125 THX , the "CALIBRATED" level is 4 dB lower than the "THX" level (switch set to "THX"). Set the control to this mark if you have only one subwoofer in the system (such as in a very small room). On both the MX-150 THX and V-125 THX , the +2 and +4 marks indicate the points where your s[...]

  • Page 8

    page 8 THX subwoofers OPERATION OF THE "BASS LEVEL" SWITCH When using the subwoofer with a non-THX processor, preamp, etc., this switch should be set to the "VARIABLE" position. The subwoofer level can then be set independently to match your speakers. The "CALIBRATED" mark is a reference relative to THX levels. For a d[...]

  • Page 9

    THX subwoofers page 9 FIGURE 5 - WIRING ONE SUBWOOFER TO AN AMP OR PREAMP WITH ONE SET OF PREAMP OUTPUTS If your surround processor has only one PREAMP OUTPUT (and no SUBWOOFER OUT), and you do not have an M&K High-Pass Filter or crossover, you must use a Y-connector to feed the amplifier and subwoofer. See Figure 5 above. If you have a surroun[...]

  • Page 10

    page 10 THX subwoofers To connect the subwoofer, run shielded RCA - RCA interconnect cables from the outputs on your component to the "INPUT" jacks found on the subwoofer's backplate. See Figure 5 on page 9. If your processor has a single subwoofer output, do not use a Y-connector to connect it to both the Left and Right input termin[...]

  • Page 11

    THX subwoofers page 11 DO NOT PLUG THE SUBWOOFER INTO A SWITCHED OUTLET ON ANOTHER COMPONENT. THE SUBWOOFER CAN DRAW UP TO 400 WATTS FROM THE AC LINE. IT MUST BE PLUGGED INTO A SOLID AC LINE. Now, play some music through your system to make sure that the Satellite speakers are working properly. If they are, carefully advance the "BASS LEVEL&qu[...]

  • Page 12

    page 12 THX subwoofers Here are two methods of setting the correct phase with your subwoofer. PHASING TEST METHOD ONE Set the switch labelled "SUBWOOFER PHASE" to the "+" position. Then, play a familiar CD, LP, laserdisc or tape with steady, consistent bass content. Listen carefully to the "mid-bass" region of 70 - 125[...]

  • Page 13

    THX subwoofers page 13 The amount and quality of bass you hear is dependent on the room itself. Low frequencies are affected by a room's size and type of construction. Rooms differ when it comes to reproducing bass, and in every room, bass quality changes when the subwoofer is moved from one location to another. A simple rule to remember is th[...]

  • Page 14

    page 14 THX subwoofers 9. USE OF SPIKED FEET WITH "MX" SUBW OOFERS If your M&K THX subwoofer is an "MX" push-pull dual driver subwoofer, we have enclosed a hardware kit consisting of four black metal spikes, threaded at one end and tapering to a sharp point at the other. Depending on their orientation, they can be used eithe[...]

  • Page 15

    THX subwoofers page 15 2. If the midbass range (the area of transition between Subwoofer and Satellite or L/C/R speakers) sounds weak: See Section 7, PHASING TEST, on page 11. Reverse the position of the "SUBWOOFER PHASE" switch on the back panel of the subwoofer. The switch position that gives the most bass is correct. 3. If you hear a t[...]

  • Page 16

    page 16 THX subwoofers 0797MX150THX &V125THX.PM6 REPLACEMENT FUSE VALUES 110 VOLT 220 VOLT 220 VOLT (3 AG 1/4" x 1 1/4" slow blow) (5 X 20 mm IEC-127/III) MX-150 THX 4 amp 2 amp T 1.6 A (time-lag) V-125 THX 2 amp 1 amp T 800 mA (time-lag) 11. IF Y OU NEED SER VICE Contact your dealer or M&K with a complete description of the probl[...]

  • Page 17

    THX subwoofers page 17[...]