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Bass Management Controller

TABLE OF CONTENTS

1.

SAFETY PRECAUTIONS..........................................................................................................3

2.

M&K’S DESIGN PHILOSOPHY...................................................................................................4
THE LOGIC OF BASS MANAGEMENT, OBSERVATIONS BY KEN KREISEL..........................4

4.

INTRODUCTION.........................................................................................................................5

INPUT AND OUTPUT CONNECTOR WIRING...............................................................7
GENERAL CONNECTION GUIDELINES........................................................................7

5.

GROUNDING......................................................................................................................7

6.

CONNECTING FOR STEREO......................................................................................................8

7.

CONNECTING FOR DOLBY DIGITAL.........................................................................................9

8.

CONNECTING FOR DTS...........................................................................................................10

9.

CALIBRATING YOUR M&K PROFESSIONAL SYSTEM...........................................................11

THE M&K PROFESSIONAL TEST DISC......................................................................11

10.

SPEAKER PLACEMENT.....................................................................................................12

ITU-R BS.775.1 RECOMMENDATION...........................................................................12

11.

GENERAL GUIDELINES FOR SPEAKER PLACEMENT..........................................................12

12.

SUBWOOFER PLACEMENT.....................................................................................................13

13.

SPEAKER CALIBRATION....................................................................................................14

14.

SUBWOOFER CALIBRATION...................................................................................................14

15.

SPECIFICATIONS.....................................................................................................................15

DIAGRAMS

FIGURE 1

FRONT  PANEL.................................................................................................................6

FIGURE 2

REAR  PANEL...................................................................................................................6

FIGURE 3

GROUNDING..................................................................................................................7

FIGURE 4

STEREO CONNECTIONS................................................................................................8

FIGURE 5

DOLBY DIGITAL 5.1 CONNECTIONS.............................................................................9

FIGURE 6

DTS 5.1 CONNECTIONS...............................................................................................10

FIGURE 7

ITU-R BS.775-1 SPEAKER PLACEMENT......................................................................12

FIGURE 8

SPEAKER CABINET ORIENTATION.............................................................................13

2

Summary of Contents for LFE-4

Page 1: ...LFE 4 Miller Kreisel Sound Inc 9351 Deering Avenue Chatsworth CA 91311 5858 USA 818 701 7010 fax 818 701 0369 www mkprofessional com 2003 Miller Kreisel Sound Inc bass management operation manual...

Page 2: ...FOR STEREO 8 7 CONNECTING FOR DOLBY DIGITAL 9 8 CONNECTING FOR DTS 10 9 CALIBRATING YOUR M K PROFESSIONAL SYSTEM 11 THE M K PROFESSIONAL TEST DISC 11 10 SPEAKER PLACEMENT 12 ITU R BS 775 1 RECOMMENDAT...

Page 3: ...his product from the wall outlet and refer servicing to qualified personnel under the following conditions When the power supply cord or plug is damaged If liquid has been spilled or objects have fall...

Page 4: ...DTS and other surround sound formats are faced with numerous challenges when trying to accurately monitor complex and dynamic material and determine how this material will sound in its intended playb...

Page 5: ...e Bass management is equally suited to all formats from 2 channel stereo to 5 1 and beyond Indeed existing control rooms that are doing stereo 2 channel mixes especially with smaller nearfield monitor...

Page 6: ...way it will ultimately be played back The LFE 4 together with a properly set up and calibrated M K monitor system allows the mixer to hear his work with more accuracy than might otherwise be possible...

Page 7: ...of the mixer and power amplifiers through the XLR cables In order to minimize the grounding problems between the LFE 4 and equipment racks the internal audio signal ground can be separated from the ch...

Page 8: ...ower amplifiers 5 Locate the external power supply for the LFE 4 and plug it into the 4 pin power connector on the back of the LFE 4 Secure it in place by turning the outer ring clockwise Plug the ext...

Page 9: ...to plus and set the gain switch to the THX position 5 If you are using passive speakers with external amplifiers connect your speaker system to the power amplifiers 6 Locate the external power supply...

Page 10: ...E 4 2 Connect the outputs of LFE 4 to the inputs of your power amplifiers or directly to your powered loudspeakers 3 Connect the mixer output assigned to the low frequency effects channel LFE to the 0...

Page 11: ...el of 4dB with 20dB of headroom the maximum signal level from the source console etc can be 24dB Therefore at very high signal levels you can only add around 3dB of gain with the trim pots before the...

Page 12: ...dation is based on placing the speakers at equal distances around a 2 5 meter circle with the height of each speaker at 1 2 meters The center speaker is placed directly in front of the listener with t...

Page 13: ...eaking it is not a good idea to place the subwoofer directly in the center between the left and right speakers There s usually a null in this location which absorbs low frequencies rather than reinfor...

Page 14: ...off your body and into the microphone Point the meter at the center speaker at about ear height Play track one of the test CD through the selected speaker and read the SPL Adjust the level to 85dB usi...

Page 15: ...ut clipping level 27 dBu Gain Adjustment 12dB THD 1kHz 4 dBu 0 002 LFE Inputs Input impedance 20K ohm balanced Nominal input level 4 dBu Maximum input level 24 dBu Gain Adjustment 12dB Gain 10dB input...

Page 16: ...LFE 4 manual PN 70360 7 08 2003 rev 1 pt qrk...

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