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operation
manual
V-1250THX
Miller & Kreisel Sound Corporation
10391 Jefferson Boulevard
Culver City, CA 90232 USA
(310) 204-2854 FAX (310) 202-8782
www.mksound.com
© 1999 MILLER & KREISEL SOUND CORP.
Manufactured under license from Lucasfilm Ltd.
Lucasfilm and THX are registered trademarks of
Lucasfilm Ltd.
THX¨Select powered subwoofer
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V-1250THX subwoofer page 2 TABLE OF CONTENTS 1. SAFETY INSTRUCTIONS................................................................................................ 3 2. INTRODUCTION .............................................................................................................. 4 3. WHERE TO PLACE YOUR SUBWOOFER ..................................................................... 4 4. OPERATION WITH THX COMPONENTS ...................................................................
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V-1250THX subwoofer page 3 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN The lightning flash with arrowhead, The exclamation point within an equi- CAUTION: lateral triangle is intended to alert the within an equilateral triangle, is in- TO PREVENT THE RISK OF ELECTRIC user of the presence of important op- tended to alert the user of the pres- SHOCK, DO NOT REMOVE COVER (OR ence of uninsulated "dangerous volt- erating and maintenance (servicing) age
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V-1250THX subwoofer page 4 2. INTRODUCTION ® Congratulations! Your new M&K THX Select 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 deal
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V-1250THX subwoofer page 5 Ultimately, the amount and quality of bass you get in your room are dependent on the room itself. Low frequency bass sounds are affected most by the size of the room and the method of construction used to build it. All rooms are different when it comes to reproducing bass, and in any given room, bass quantity and quality changes when the Subwoofer is moved from one location to another. A simple rule to remember is tha
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V-1250THX subwoofer page 6 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 subwoofer outputs, use a stereo shielded cable, connecting it to the LEFT and RIGHT "INPUT" terminals on the subwoofer. If your THX controller has only a single mono subwoofer output, use a mono cable and connect it to the subwoofer's "LEFT/MONO" "INPUT" jack. See Figure 1 below. Do n
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V-1250THX subwoofer page 7 If you have two subwoofers, do not use a Y - connector to feed both inputs on each subwoofer. Connect the interconnect cable to the LEFT/MONO "INPUT" only. Run the Left interconnect cable to the Left subwoofer and the Right cable to the Right subwoofer. See Figure 2 on Page 6. 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
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V-1250THX subwoofer page 8 The +2 and +4 marks indicate the points where your subwoofer is producing 2 dB and 4 dB, respectively, more output than the "CALIBRATED" level. SETTING SUBWOOFER LEVEL (THX) The proper method of setting the level of the subwoofer in THX mode is to use the low frequency pink noise test signal generator built into the THX controller and a sound level meter (available from Radio Shack). First set the master volume of the THX controller to the "0" or "REF" position. Then
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V-1250THX subwoofer page 9 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 discussion of this "CALIBRATED" mark, please see "OPERATION OF THE BASS LEVEL SWITCH (THX)" on page 7. WIRING WITH A NO
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V-1250THX subwoofer page 10 FIGURE 4 -WIRING TWO SUBWOOFERS TO AN AMP OR PROCESSOR WITH A SUBWOOFER OUTPUT JACK (NON-THX) SUBWOOFER (or MONO) OUT SURROUND PROCESSOR use a Y-connector to connect to two subwoofers BASS LEVEL BASS LEVEL LOW PASS LOW PASS REFERENCE LEFT/MONO RIGHT REFERENCE LEFT/MONO RIGHT FILTER FILTER + + +3 dB VARIABLE +3 dB VARIABLE 80 Hz 80 Hz +6 dB 24 dB/OCTAVE +6 dB 24 dB/OCTAVE INPUT INPUT THX THX THX THX PHASE PHASE CAUTION CAUTION RISK OF ELECTRIC SHOCK RISK OF ELECTRI
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V-1250THX subwoofer page 11 FIGURE 6 - WIRING TWO SUBWOOFERS TO AN AMP OR PREAMP WITH ONE SET OF PREAMP OUTPUTS POWER AMP MAIN IN LEFT RIGHT MAIN OUT LEFT RIGHT use one Y-connector PREAMP for each channel to split the output of the preamp BASS LEVEL LOW PASS BASS LEVEL LOW PASS REFERENCE LEFT/MONO RIGHT FILTER REFERENCE LEFT/MONO RIGHT + FILTER +3 dB VARIABLE 80 Hz +3 dB VARIABLE + 80 Hz 24 dB/OCTAVE +6 dB +6 dB 24 dB/OCTAVE INPUT INPUT THX TH
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V-1250THX subwoofer page 12 receiver, amp or preamp's MAIN OUTPUT to the input jacks on the HP/VF-80. Run another set of interconnects from the high frequency output jacks on the filter to receiver or amp's POWER AMP inputs. Last, run interconnects from the subwoofer output jacks to the subwoofer's "FROM PREAMP" jacks. See the instructions enclosed with your filter for wiring diagrams. To use these filters, make certain that the "BASS LEVEL" switch is set to "VARIABLE" and that the "LOW PASS
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V-1250THX subwoofer page 13 response, as the room modes excited by one woofer are complemented by the presence of the other. Alternately, if you stack two subwoofers, one on top of the other, their outputs will couple and give you an additional total of 6 dB of output. Wiring with two subwoofers is simple. Instead of running two interconnect cables to one subwoofer, just run one interconnect to each subwoofer, using the LEFT/MONO input on each s
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V-1250THX subwoofer page 14 If you want to experiment, move the main speakers or subwoofer towards or away from your listening position, in small increments. When you hear the best combination of stereo image localization and focus with solid midbass impact and output, you have the ideal location. If you have two subwoofers, perform one test for each subwoofer. When you perform each test, make sure the other subwoofer is not operating by either unplugging its input cable or its power cord. 8.
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V-1250THX subwoofer page 15 Because the subwoofer easily reproduces 60 Hz signals (the frequency of hum), it is often blamed for causing hum that originates elsewhere in the system. Always avoid running all speaker wires and RCA interconnect cables near to AC cords and component power supplies. Placing wires and cables close to AC lines often results in hum. If necessary, reroute your cables. To identify the source of hum, remove all input ca
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V-1250THX subwoofer page 16 9. IF YOU NEED SERVICE Contact your dealer or M&K with a complete description of the problem. Please have the unit's model and serial numbers (found on the back of the cabinet), date of purchase, and your dealer's name. You can call M&K between 8:30 AM and 5:00 PM Pacific Time, Monday through Friday, at (310) 204-2854. If you call outside these hours, leave a message, and we will return your call. DO NOT RETURN YOUR SPEAKERS TO THE FACTORY FOR SERVICE WITHOUT OBTAI
