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Requisite Audio Engineering L2M MKIII M/S VERSION Operator's Manual

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T H E L 2 M M K I I I M / S V E R S I O N
O p ti c a l Le v e lin g A m p lifie r
B y R eq u i s i te A u d io E n g i n e e r i n g
OPERATOR'S MANUAL
2 1 7 5 G o o d y e a r Av e . , S u i t e 11 0 , S a n B u e n a Ve n t u r a , C a l i f o r n i a 9 3 0 0 3
t e l e p h o n e : 8 1 8 . 4 3 7 . 0 7 7 9 • w w w. r e q u i s i t e A u d i o . c o m

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Summary of Contents for Requisite Audio Engineering L2M MKIII M/S VERSION

  • Page 1 T H E L 2 M M K I I I M / S V E R S I O N O p ti c a l Le v e lin g A m p lifie r B y R eq u i s i te A u d io E n g i n e e r i n g OPERATOR’S MANUAL 2 1 7 5 G o o d y e a r Av e .

  • Page 2: Table Of Contents

    T H E L 2 M M K I I I M / S V E R S I O N TABLE OF CONTENTS INTRODUCTION RECEIVING YOUR L2M UNPACKING and INSPECTION: GENERAL NOTES WARNING: THIS SHIPMENT SHOULD INCLUDE: SERVICING: ENVIRONMENTAL CONSIDERATIONS: FRONT PANEL CONTROLS (top &...
  • Page 3 T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CONTROLS (center row) MID MID - OPERATIONAL NOTE: SIDE STEREO LEVEL RIDE STEREO LEVEL RIDE - OPERATIONAL NOTE: FRONT PANEL CONTROLS (center row- continued) PK REDUCTION (MONO - LINK) PK REDUCTION - OPERATIONAL NOTE:...
  • Page 4 T H E L 2 M M K I I I M / S V E R S I O N REAR PANEL (LEFT to RIGHT, top and bottom row) GROUND POWER SUPPLY INLET AUDIO OUTPUTS LIMITER LINK TUBE CHANNEL TUBE PLACEMENT and FUNCTION (left to right) AUDIO INPUTS OUTBOARD POWER SUPPLIES...

  • Page 5: Introduction

    THANK YOU Thank you for selecting the L2M Mastering Limiter and thereby making it a part of your art. The L2M MkIII M/S Version is the third generation of our L2M platform, now in it’s 12th year of production (2011).

  • Page 6: Receiving Your L2M

    If you have any questions regarding this notice or the shipment itself, please notify us immediately. Thank you, Requisite Audio Engineering 818.437.0779 R e q u i s i t e A u d i o E n g i n e e r i n g...

  • Page 7: General Notes

    WARNING: DO NOT OPEN THE CABINET - RISK OF SEVERE ELECTRICAL SHOCK THIS SHIPMENT SHOULD INCLUDE: Model L2M MkIII M/S Version Mastering Limiter Model OPS-2D Solid-State Power Supply or RTS-2A Tube Power Supply L2M Operator’s Manual (this book) A.C. Cable SERVICING: The user should not attempt to service this unit beyond that described in this manual.

  • Page 8: Front Panel Controls (Top & Bottom Rows)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CONTROLS (top & bottom rows) IN/BYPASS This switch (2 each) is a "true-hardwired" bypass, making a straight connection from input to output allowing for accurate comparison of source and processed audio.

  • Page 9: Front Panel Controls (Continued)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CONTROLS (continued) LIMITER FEEDBACK Left to run freely, vacuum tubes are not linear and exhibit a considerable amount of harmonic generation and other forms of distortion.

  • Page 10: Limiter Response

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CONTROLS (continued) RATIO 10:1 / 3:1 The purpose of this switch (Channel 1 & Channel 2) is to allow selection of either compressor (3:1) or limiter (10:1).

  • Page 11: Front Panel Controls (Center Row)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CONTROLS (center row) With the MID control pulled out and in the fully-clockwise position, center is normal. Fully- counterclockwise Mid disappears.

  • Page 12: Front Panel Controls (Center Row- Continued)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CONTROLS (center row- continued) PK REDUCTION (MONO - LINK) When operating in stereo or multi-channel mode, there is the option to LINK the triggering ac- tion of each channel.

  • Page 13: Front Panel Calibration Points

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CALIBRATION POINTS ZERO ADJ The ZERO ADJ trimmer (2 each) is used to adjust the meter while in the GR (Gain Reduction) mode.

  • Page 14: Front Panel Calibration Points (Continued)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CALIBRATION POINTS (continued) VU ADJ VU ADJUST is for calibration of VU only. It does not affect GAIN REDUCTION readings. VU ADJ - CALIBRATION PROCEDURE: •...

  • Page 15: Front Panel Calibration Points (Continued)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CALIBRATION POINTS (continued) STEREO ADJ - CALIBRATION PROCEDURE: • Verify that ZERO ADJ, GR TRACK and VU ADJ are all calibrated. If not, follow the above in- structions for getting them to read accurately.

  • Page 16: Front Panel Calibration Points (Continued)

    T H E L 2 M M K I I I M / S V E R S I O N FRONT PANEL CALIBRATION POINTS (continued) STEREO ADJ - OPERATIONAL NOTE: Overtime, (perhaps many years) it will become evident that STEREO ADJ will need to be reset to a higher overall level.
  • Page 17 T H E L 2 M M K I I I M / S V E R S I O N REAR PANEL (LEFT to RIGHT, top and bottom row) GROUND Banana Plug connection to CHASSIS Ground and/or CIRCUIT Ground is provided. Need for connection is unlikely, but can be useful in eliminating or finding source of hum, should hum exist.
  • Page 18 T H E L 2 M M K I I I M / S V E R S I O N OUTBOARD POWER SUPPLIES POWER SUPPLIES For the L2M MkIII M/S Version, and all Requisite mainframe audio processors, there is a choice of two different power supplies: • OPS-2D solid-state supply (1 to 2 channels) •...
  • Page 19 T H E L 2 M M K I I I M / S V E R S I O N WARRANTY For a period of 2 years after original purchase, Requisite Audio Engineering will, free of charge, repair this product if it fails due to defective materials or workmanship. This limited warranty is subject to the following limitations: •...

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