Requisite Audio Engineering L2M MKIII M/S VERSION Operator'S Manual Download Page 12

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.  The PK REDUCTION mode switch can be used for MONO or LINK op-
eration.  It is also connected to the LINK jacks (found on the real panel) for interconnection of 
additional L2M units (5.1) or external triggering of limiting action. 

PK REDUCTION - OPERATIONAL NOTE:

Though it is customary to LINK when processing stereo material, keep in mind that the forgiv-
ing nature of the optical attenuators found in the L2M allows for mono operation when process-
ing most stereo material. We encourage experimentation in this regard. 

LINK allows each channel to “see” what the other channel “sees”.   LINK does not link parame-
ters.  In other words, when processing stereo material, be sure to adjust the controls of both 
channels to identical settings.  In link mode, a single PEAK REDUCTION knob can initiate gain 
reduction in both channels, however, you will not be able to get balanced LIMITER RESPONSE 
or RATIO without both channel’s controls adjusted to the same settings.

METER SELECT

GR/+4/+10 Meter Mode Select - When METER SELECT is placed in the GR position, the meter 
will indicate the amount of gain reduction and/or peak limiting in -dB.  The meter is calibrated 
(see ZERO ADJ CALIBRATION) to read 100% or 0dB during periods of no gain reduction. 

When the selector switch is placed in the +4 position, the VU meter will indicate the balanced 
output level (post gain reduction) as 0 = +4dBu (0.775v).  

When the selector switch is placed in the +10 position, the VU meter will indicate the balanced 
output level (post gain reduction) as 0 = +10dBu (2.45V).

T H E   L 2 M   M K I I I     M / S   V E R S I O N

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

L 2 M   M k I I I

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Summary of Contents for L2M MKIII M/S VERSION

Page 1: ...2M MKIII M S VERSION Optical Leveling Amplifier By Requisite Audio Engineering OPERATOR S MANUAL 2175 Goodyear Ave Suite 110 San BuenaVentura California 93003 telephone 818 437 0779 www requisiteAudio...

Page 2: ...ottom rows 4 IN BYPASS 4 IN BYPASS OPERATIONAL NOTE 4 OUTPUT LEVEL 4 OUTPUT LEVEL OPERATIONAL NOTE 4 OUTPUT LEVEL CALIBRATION PROCEDURE 4 FRONT PANEL CONTROLS continued 5 LIMITER FEEDBACK 5 LIMITER FE...

Page 3: ...NT PANEL CALIBRATION POINTS 9 ZERO ADJ 9 ZERO ADJUST OPERATIONAL NOTE 9 GR TRACK 9 GR TRACK CALIBRATION PROCEDURE 9 FRONT PANEL CALIBRATION POINTS continued 10 VU ADJ 10 VU ADJ CALIBRATION PROCEDURE 1...

Page 4: ...TPUTS 13 LIMITER LINK 13 TUBE CHANNEL 13 TUBE PLACEMENT and FUNCTION left to right 13 AUDIO INPUTS 13 OUTBOARD POWER SUPPLIES 14 POWER SUPPLIES 14 POWER ON 14 POWER CABLE 14 VOLTAGE SELECT 14 FUSE 14...

Page 5: ...sents what a truly refined optical limiter can be Among the more notable performance features of the L2M are it s sonic excellence ver satility and stable frequency response while limiting program mat...

Page 6: ...l shipment Here s what to do if the shipment has been damaged Leave the product its packing materials and box as is Notify the carrier s local office and request an immediate inspection of the shipmen...

Page 7: ...MENTAL CONSIDERATIONS This and all electronic equipment require adequate ventilation and a dry environment for safe operation and long component life If proper ventilation from behind the unit is prov...

Page 8: ...hange in volume This can be confirmed by injecting a 1 kHz tone and ob serving an outboard DMM or other suitable meter The L2M is shipped with UNITY calibrated to within 1dB Each channel is calibrated...

Page 9: ...on the output level of the audio which is why it is done in calibrated 1dB increments on the L2M Because of this proper setting of make up gain is the combined settings for OUTPUT LEVEL and LIMITER F...

Page 10: ...ed smoothing of mid and high frequencies above 1 kHz and a tight and punchy bass response LIMITER RESPONSE OPERATIONAL NOTE For uniform limiter initiation and response in MONO or LINK mode both channe...

Page 11: ...right is right L R At the 12 o clock position both left and right are in center mono At it s fully clockwise position the image is flipped left is on the right and right is on the left R L The side co...

Page 12: ...ame ters In other words when processing stereo material be sure to adjust the controls of both channels to identical settings In link mode a single PEAK REDUCTION knob can initiate gain reduction in b...

Page 13: ...ak reduction activity Set PEAK REDUCTION LIMITER RESPONSE fully counterclockwise Set OUTPUT LEVEL LIMITER FEEDBACK STEREO LEVEL RIDE to UNITY Set RATIO to 3 1 and IN BYPASS to IN Determine that ZERO A...

Page 14: ...across pins 2 3 of the OUTPUT XLR Set IN BYPASS to IN Select 10 on the METER SELECT and observe if the VU METER reads 0dB Adjust as necessary 4dBu is factory set to follow the 10dBu calibration After...

Page 15: ...REDUCTION Increase PEAK REDUCTION both channels until the VU METER drops to 4dB on both channels Using METER SELECT set to GR to see if both meters read 5dBu The additional 1dB is to compensate for me...

Page 16: ...T and observe that both VU METERs read 0dB Select MONO on PK REDUCTION meter mode select Set PEAK REDUCTION both channels to the 12 o clock position Raise the STEREO ADJ trimmer on each channel until...

Page 17: ...ng phase Pin 3 negative going phase LIMITER LINK Top for Channel 1 Bottom for Channel 2 Both become linked to each other when PK REDUC TION mode switch is set to LINK TUBE CHANNEL Protective housing f...

Page 18: ...cable to the jack on the L2M mainframe If powering only one L2M unit with a supply having extra cables be sure the unused cable s is rolled up and fastened to the supply with a cover over the unused e...

Page 19: ...ies except as listed above TUBES OPTOS and LIGHT BULBS are not covered by this warranty but receive a 90 day warranty REQUISITE AUDIO SHALL NOT BE LIABLE FOR PROPERTY DAMAGE OR ANY OTHER INCIDENTAL OR...

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