ARREL AUDIO ML-118 Mid-Side Unit Livio Argentini, Marco Re ARREL AUDIO Rome Via Arnoldo Mondadori 7 00128 Rome-Italy AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 1 / 32
intro List of the Arguments List of the Arguments ARREL AUDIO ML-118 Characteristics 1 ARREL AUDIO ML-118 Architecture 2 ARREL AUDIO ML-118 Connections 3 ARREL AUDIO ML-118 Applications 4 ARREL AUDIO ML-118 Market Comparison 5 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 2 / 32
intro ARREL AUDIO ML-118 Main Characteristics ARREL AUDIO ML-118 Main Characteristics Outstanding sound quality, state of the art analog components 1 Handmade production 2 New functions not available on other Mid-Side units on the market 3 Input Stage electronically balanced (no transformers) for 4 maximum sound transparency Analog Coding and Deconding Mid-Side matrix 5 HI-PASS (F x 4) and LO-PASS (F x 10) Filters in the analog 6 processing chain (-12 dB/Oct) Very flexible Insert section 7 Dry/Wet separate controls for L+R and L-R 8 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 3 / 32
intro ARREL AUDIO ML-118 Main Characteristics ARREL AUDIO ML-118 Main Characteristics Phase reverse in the analog processing chain 1 Very flexible VU/MON section 2 High quality VU Meters for level measurements 3 Stereo function push button 4 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 4 / 32
intro ML-118 Front Panel ML-118 Front Panel INSERT 3 ON AUDIO L+R / LEFT 100 3 S 60 2 12 E 8 N 200 4 VU VU D STEREO 16 40 1 2 3 1 L 4 250 5 LEVEL 20 DRY WET OUT 20 R Monster POWER HI PASS LO PASS E MID-SIDE INSERT T L+R L-R ON F x10 ON F x4 PHASE L ML - 118 LEFT RIGHT INPUT LEVEL L-R / RIGHT S 100 3 STEREO L+R / L-R STEREO E 12 60 2 N 0 OUT 0 OUT IN LEFT RIGHT 8 D 200 WET OUT 4 16 R 40 1 2 3 DRY CAL 1 4 -6 +6 -6 +6 250 LEVEL 5 DRY WET OUT L E F T RIGHT V U / M O N R 20 20 MONITOR E MUTE + 4 dBu HI PASS LO PASS T L+R / L L-R / R INSERT CAL R ON F x10 ON F x4 PHASE AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 5 / 32
intro ML-118 Back Panel ML-118 Back Panel INSERT 1/2 DESIGNED AND MANUFACTURED 1 GND AUDIO IN ITALY 13 GROUND 2 HOT 25 GROUND 12 3 COLD L+R SEND 1- MONSTER 24 L+R SEND 1+ 11 GROUND 23 MID-SIDE L+R RET 1- 10 L+R RET 1+ GROUND 22 ML - 118 9 OUTPUT INPUT L+R SEND 2- 21 L+R SEND 2+ 8 GROUND L+R RET 2- 20 7 L+R RET 2+ GROUND 19 R I G H T LEFT RIGHT L E F T 6 L-R SEND 1- L-R SEND 1+ 18 5 GROUND L-R RET 1- 17 MAINS IN 110/220 V AC 4 L-R RET 1+ GROUND 16 3 L-R SEND 2- 15 L-R SEND 2+ 2 GROUND 14 ON L-R RET 2- 220 1 WARNING L-R RET 2+ CAUTION TO REDUCE THE RISK OF FIRE OR EJECTRIC FUSE RISK OF ELECTRIC SHOCK SHOCK DO NOT EXPOSE THIS EQUIPMENT DO NOT OPEN TO RAIN OR MOISTURE OFF 50 / 60 Hz - 30 W. FUSE 600 mA AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 6 / 32
intro ML-118 Input Stage ML-118 Input Stage Electronically balanced: + 4dBu standard input level 1 Calibration switch to change the input gain to different standards 2 (Make-Up gain in the range [0; 10 dB]) VU meter measurement of the input level (VU/MON switch) 3 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 7 / 32
intro ML-118 Input Stage ML-118 Input Stage INSERT 3 AUDIO S E N D STEREO L MONSTER R E MID-SIDE T CALIBRATION L ML - 118 GAIN LED INPUT LEVEL S E N INPUT GAIN LEFT RIGHT D KNOBS R CAL R CALIBRATION E + 4 dBu BUTTON T CAL R AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 8 / 32
intro ML-118 Input Stage Level Measurement set-up ML-118 Input Stage Level Measurement set-up ON POWER L+R / L-R STEREO OUT IN WET OUT DRY VU / MON MUTE L+R / L L-R / R AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 9 / 32
intro ML-118 Coding Matrix ML-118 Coding Matrix Analog processing to obtain the L+R and L-R signals 1 Variable gains on the L-R and L+R to adjust the amplitude to + 2 4dBu for maximum SNR (L+R and L-R have very different levels) The dry signal can be measured on the VU meters before the 3 analog processing section AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 10 / 32
intro ML-118 Coding Matrix ML-118 Coding Matrix AUDIO 100 60 200 STEREO 40 250 LEVEL 20 MONSTER HI PASS MID-SIDE F x10 ON ML - 118 INPUT LEVEL 100 60 LEFT RIGHT 200 40 CAL 250 LEVEL 20 + 4 dBu HI PASS CAL F x10 ON AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 11 / 32
intro ML-118 Coding Matrix Dry Signal Measurement ML-118 Coding Matrix Dry Signal Measurement L+R / L-R STEREO OUT IN WET OUT DRY VU / MON MUTE L+R / L L-R / R AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 12 / 32
intro ML-118 L+R, L-R filtering sections ML-118 L+R, L-R filtering sections HI-PASS and LOW-PASS filters 1 True bypass switch 2 HI-PASS normal range (20-250 Hz) Fx10 (200-2500 Hz) 3 LO-PASS normal range (1-5 kHz) Fx4 (4-20 kHz) 4 -12/Oct filter slope 5 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 13 / 32
intro ML-118 L+R, L-R filtering sections ML-118 L+R, L-R filtering sections HIGH PASS LO PASS CUT-OFF FREQUENCY CUT-OFF FREQUENCY L+R / LEFT 100 3 60 2 12 8 200 4 16 40 1 2 3 1 4 250 5 LEVEL DRY WET OUT 20 20 HI PASS LO PASS INSERT O N F x10 O N F x4 PHASE HIGH PASS HIGH PASS ON-OFF LO PASS ON-OFF LO PASS 10 X FREQUENCY BUTTON BUTTON 4 X FREQUENCY AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 14 / 32
intro ML-118 Insert section ML-118 Insert section Three Inserts 1 Two inserts on the back panel 2 One insert on the front panel 3 Front panel insert very useful for on-the-fly outboard connections 4 Insert selection by push buttons 5 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 15 / 32
intro ML-118 Insert Section ML-118 Insert Section L+R / LEFT 100 3 12 60 2 8 200 4 16 40 1 2 3 1 4 250 5 LEVEL DRY WET OUT 20 20 HI PASS LO PASS INSERT O N F x10 O N F x4 PHASE AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 16 / 32
intro ML-118 Phase, Dry/Wet level, Out Level ML-118 Phase, Dry/Wet level, Out Level Phase reverse to implement notch filtering (see slide 28) 1 Dry-Wet knob 2 L+R and L-R output gains 3 Level Measurement for Wet 4 Level Measurement for Out 5 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 17 / 32
intro ML-118 Phase, Dry/Wet level, Out Level ML-118 Phase, Dry/Wet level, Out Level OUTPUT DRY-WET LEVEL KNOB KNOB L+R / LEFT 100 3 60 2 12 8 200 4 16 40 1 2 3 1 4 250 5 LEVEL DRY WET OUT 20 20 HI PASS LO PASS INSERT O N F x10 O N F x4 PHASE PHASE REVERSE BUTTON AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 18 / 32
intro ML-118 Phase, Dry/Wet level, Out Level ML-118 Phase, Dry/Wet level, Out Level L+R / L-R STEREO L+R / L-R STEREO OUT IN OUT IN WET OUT WET OUT DRY DRY VU / MON VU / MON MUTE MUTE L+R / L L-R / R L+R / L L-R / R AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 19 / 32
intro ML-118 Stereo Output Stage ML-118 Stereo Output Stage Coding analog processor to obtain L and R channels 1 Two potentiometers (center detent) to change the level (gain 2 range ± 6 dB) of the decoded L and R VU/MON switch (STEREO (OUT) position) (measurement not 3 affected by the LEFT/RIGHT gains) MONITOR button: signals selected by VU/MON switch sent to the 4 main outputs MUTE function to monitor the L+R and the L-R channel separately 5 L/R outs true electronically balanced 6 AUDIO Livio Argentini, Marco Re ( ARREL AUDIO RomeVia Arnoldo Mondadori 7 00128 Rome-Italy) ARREL AUDIO ML-118 Mid-Side Unit 20 / 32
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