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8

DRAWMER

AUDIO CONNECTIONS

• Interference:

If the unit is to be used where it maybe exposed

to high levels of disturbance such as found

close to a TV or radio transmitter, we advise

that the unit is operated in a balanced

configuration. The screens of the signal cables

should be connected to the chassis

connection on the XLR connector as opposed

to connecting to pin1. The MC3.1 conforms to

the EMC standards.

• Ground Loops:

If ground loop problems are encountered,

never disconnect the mains earth, but instead,

try disconnecting the signal screen on one end

of each of the cables connecting the outputs of

the MC3.1 to the patchbay. If such measures

are necessary, balanced operation is

recommended.

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Summary of Contents for MC 3.1

Page 1: ...Power Connection Security Portable Appliance Testing Audio Connection Typical Connection Guide Chapter 2 Control Description Contol Description Intro Monitor Calibration Mix Checking Tips Chapter 3 General Information If a fault develops Contacting Drawmer Specification Block Diagram 3 3 3 4 6 7 7 7 8 9 10 18 22 26 26 26 27 ...

Page 2: ...2 DRAWMER ...

Page 3: ...countries do not allow the exclusion of impliedwarranties orlimitationsonhow longanimplied warrantymay last sothe abovelimitations maynot applytoyou This warrantygives youspecificlegalrights Youmayhaveadditionalrightsthat varyfrom stateto state andcountry to country For the USA FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT Thisequipment has beentested and found tocomplyw...

Page 4: ... dedicated cue mix output is also available A secondary preset volume control on the front provides repeatable calibrated output level for the monitors so that at the flick of a switch the engineer can hear the mix at the same predetermined volume time after time without having to meticulously adjust controls The MC3 1 incorporates three stereo balanced speaker outputs plus a dedicated mono speake...

Page 5: ...anel 3 5mm AUX Input Level Control for connecting MP3 player smartphone or tablet etc Cue Level Control adjusts the volume for the Artist s Monitors Built In Talkback with Level Control Internal or External Microphone Switching via Desktop or Footswitch a Mono Output Jack Internal Routing to Headphone and Cue Outputs Comprehensive Mix Checking facilities Including Low Mid High Solo Dim L R Mute Ph...

Page 6: ...sk the speaker trims on the base of the unit will not be accessible and so the calibration procedure should be carried out before fastening the MC3 1 in place see Monitor Calibration Drill four holes into the desk at 4mm in diameter and to the dimensions as shown in the diagram Note that in the diagram the MC3 1 is viewed from above Pushingfourscrewsthroughtheundersid of the desk screw the MC3 1 i...

Page 7: ...ied Before connecting the MC3 1 to the power supply ensure that all knobs are turned off i e fully anticlockwise and that the Level Switch just below the main volume control is set to Knob A switch next to the d c power inlet on the rear of the unit switches the power on off POWER CONNECTION PORTABLE APPLIANCE TESTING To undergo a Portable Appliance Testing procedure commonly known as PAT PAT Insp...

Page 8: ... of the signal cables should be connected to the chassis connection on the XLR connector as opposed to connecting to pin1 The MC3 1 conforms to the EMC standards Ground Loops If ground loop problems are encountered never disconnect the mains earth but instead try disconnecting the signal screen on one end of each of the cables connecting the outputs of the MC3 1 to the patchbay If such measures ar...

Page 9: ...9 MC3 1 Monitor Controller TYPICAL CONNECTION GUIDE ...

Page 10: ...1 0 DRAWMER CONTROL DESCRIPTION CHAPTER 2 ...

Page 11: ...ted talkback function including inbuilt microphone external microphone port gain level control and external footswitch connector External Mic Switch When active disengages the inbuilt front panel microphone and routes the operator s voice through an external microphone not supplied which is plugged into the rear panel see Talkback Active Switch When active engages either the inbuilt or external mi...

Page 12: ...itor could be attached to C so with the C switch active SUB should be disengaged Note that each speaker output has individual level trimming on the base of the unit so that precise monitor level matching can be achieved see sections and also the Monitor Calibration section MASTER VOLUME The Monitor Volume control adjusts the signal level of both stereo channels for all speaker outputs The Volume k...

Page 13: ...ible A POWER LED is located within this section and when lit indicates that the unit is switched on To turn the MC3 1 on see the mains input section HEADPHONES The MC3 1 has two dedicated headphone outputs via 1 4 TRS jacks located on the front edge each with individual source select and level control Note that they have their own level control and are not affected by the main monitor volume knob ...

Page 14: ...ircuit is completely relay bypassed Phase Reverse Inverts the polarity of the signal on the Left Channel and is used primarily to outline any phase problems that may be occurring in the mix recording such as phase cancellation or an unbalanced stereo signal As the switch is toggled any phase issues will become more apparent and easier to identify Left Right Swap Swaps the Left and Right channels o...

Page 15: ...Left or Right Cut whilst using headphones the signal is not 100 panned one way or the other i e the signal centre moves to the side but is not completely removed from the opposite ear of the headphone this is so that the Left Right Cut sounds a little more natural after all if listening through speakers with only the left speaker active some of the signal well reach the right ear a few millisecond...

Page 16: ...ut SUB MONO are found on the rear of the unit all in the form of Neutrik 3 pin XLR s Each of these outputs has an individual Left Right Mono trim potentiometer on the underside of the unit to enable easy and accurate monitor level room matching throughout see Monitor Calibration Each output is activated by the Speakers switches see and can be activated individually or simultaneously and in any con...

Page 17: ...ing acoustic ensembles where the performers may not wish or need to wear headphones The output also allows for routing into a separate channel of a DAW or other recording facility to allow for information overdubs to be added to a recording SPEAKER CALIBRATIONTRIM CONTROLS On the underside of the MC3 1 there are seven rotary controls that allow the individual speaker level calibration of your syst...

Page 18: ...eferred type You can purchase an SPL meter from most electronic stores or search the internet in stores such as Amazon with prices ranging from 25 to 800 Radio Shack is a good source for reasonably priced SPL meters in the USA though to get better results you may consider a more expensive SPL meter such as Galaxy Gold Line Nady etc The ideal meter should have the industry standard C weighted curve...

Page 19: ...e level to 85dB the standard listening level for film tv and music however due to the sound being altered by the size of the room this can alter essentially the smaller your room is the lower your listening level should be down to around 76dB The following table should give an idea of the sound pressure level to use for your environment Cubic Feet 20 000 10 000 to 19 999 5 000 to 9 999 1 500 to 4 ...

Page 20: ...of the MC3 1 to 12 0 clock and leave it there throughout the calibration procedure this will be the position that provides the 85dB listening level from now on 6 Turn the system on and play the 500 Hz 2 5 kHz bandwidth limited pink noise at 20 dBFS Select the required Source on the front of the MC3 1 I P1 I P2 I P3 AUX or DIGI You should not hear it yet 7 Activate the A Speaker by having only the ...

Page 21: ... readings should be pretty close and only require fine adjustment 16 Now the system is calibrated it is time to set the PRESET volume control Set the Master Volume switch to PRESET and with only one set of speakers active in the Speaker Select switches adjust the preset level on the front of the MC3 1 using a screwdriver until the SPL meter reads your desired listening level 16 You are finished an...

Page 22: ...ould be If something is too quiet or loud adjust its volume or use E Q to fix it If the mix sounds good at low levels it s likely that it will when loud Note that on the MC3 1 it is better to lower the volume level using the DIM switch and then turn the volume up rather than only turning the volume down as you maintain greater control over the volume as well as better left right channel matching I...

Page 23: ...ny cases the low frequencies will be put through a crossover and summed to mono before being sent to the sub such as in a home theatre system for example Monogising is also necessary when testing the audio for use on nonstandard applications such as for broadcast or mobile phone In addition monogising will highlight phase problems In some cases when you activate the Mono switch you may hear comb f...

Page 24: ... simple Being able to audition the side signal is particularly useful for judging the quality and quantity of any ambience or reverberation in a stereo mix It is also an invaluable facility if the stereo recording has timing differences between channels such as caused by an azimuth error on a tape machine or for aligning a pair of desk channels for use with X Y stereo mic pairs In both cases liste...

Page 25: ...ransient fidelity Moreover cable lengths of tens of meters should not be an issue Furthermore it makes it possible to introduce mix checking features that would otherwise be missing The disadvantage with active monitor controllers is that the electronics have the potential to introduce noise and distortion Designing a clean monitor control system is far from simple however using only the very best...

Page 26: ...from Drawmer or their authorised representative For service claims under the warranty agreement a service Returns Authorisation RA number will be issued Write this RA number in large letters in a prominent position on the shipping box Enclose your name address telephone number copy of the original sales invoice and a detailed description of the problem Authorised returns should be prepaid and must...

Page 27: ...2 7 MC3 1 Monitor Controller Ref 1v00 A 18 08 16 BLOCK DIAGRAM ...

Page 28: ...DRAWMER Drawmer Electronics Ltd Coleman St Parkgate Rotherham South Yorkshire U K ...

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