Drawmer MC2.1 User Manual

DRAWMER
CONTENTS
Warranty Safety Consideration Radio Frequencies Statement
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Chapter 1 - Introduction
Introduction Ins talla tion Power Con nection Portable Applinace Testing Audio Connection Typical Con nection Guide
Chapter 2 - Control Description
Contol Description Intro MC2.1 Controls Monitor Calibra tion Mix Checking Tips
Chapter 3 - General Information
If a fault develops Contacting Drawmer Specification Block Diagram
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DRAWMER
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Thi s m a nual is c op yri gh ted © 20 13 by Drawmer El ec t r on ic s Ltd. W ith all r i g hts rese rved. Un der copyright laws, no part of t hi s public ation may b e reproduce d, transmitted, stored in a retrieval syste m or translated into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, witho ut th e w ri tte n p ermiss io n of Dr awm e r E le c tr oni c s Lt d.
ONE YEAR LIMITED WARRA NTY
COPYRIGHT
Drawmer Electr on ics Ltd. , warr ants the D ra wmer MC2 .1 Mon itor Controller to conform substantially to the specifications of this
manual for a period of one y ear fr om the or iginal dat e of purcha se when used in accordance with the specifications detailed in t his manual. In the case of a valid warranty claim, your sole and exclusive remedy and Drawmer’s entire liability under any theor y of liability will be to, at Drawmer’s discretion, repair or replace the product without charge, or, if not possible, to refund the purchase price to you. This warranty is not transferable. It applies only to the original purchaser of the product.
For warranty service please call your local Drawm er dealer. Alternatively call Drawmer Electronics Ltd. at +44 (0)1709 527574. Then ship the defective product, with transportation and insurance charges pre -paid, to Dr awmer Electr onics Ltd., Cole man Street, Parkgate, Rotherham, S62 6EL UK. Write the RA number in large letters in a pr ominent position on the shipping bo x . Enclose y our name, address, telephone number, copy of the original sales invoice and a detailed description of the problem. Drawmer will not accept responsib ility fo r loss or damage durin g tra nsit.
This warranty is void if the product has been damaged by misuse, modification, unauthorised repair or installed with other equipment that proved to be faulty.
THIS WARRANTY I S IN LI EU OF ALL WARRANTIES, WHETHER ORAL O R WRIT TE N, EXPRES SED, I MPL I ED OR STA T U TO R Y . DRAWMER MAKES NO OTHER WARRANTY EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANT ABILIT Y, FI TN ESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. PURCHASER’S SOLE AND EXCLUSI VE REMEDY UNDER TH IS WARRANTY SHALL BE REPAIR OR REPLACEMENT AS SPECIFIED HEREI N. IN NO EVENT W ILL DRAW MER ELECTRONICS LTD. BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIA L, INCIDENTAL OR CONSEQUENTIAL DAMAGES RES ULTING FROM ANY DEFECT IN THE PRODUCT, INCLUDING LOST PROFITS, DAMAGE TO PRO PERT Y, AN D, T O T HE EXT ENT PERMIT T ED BY LAW, DAMAGE FOR PERSONAL INJURY, EVEN IF DRAWMER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAM AGE S.
Some states and specific coun tries do no t allow the exclusion of implied warranties or limitations on how long an implied warranty may last, so the above limitations may not apply to y ou. T his warranty giv es you specific legal rights. You may hav e additional rights that var y from state to state, and country to country .
FEDERAL COMMUNICA TI ONS COMMISSION RADIO
FREQUENCY INTERFERENCE ST A TE MENT
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interfere nce in a residenti al installation. T his equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off an on, then the user is encouraged to try to correct the interference by one or more of the following measures:
Re-orient or relocate the receiving antenna. Increase the separation between the equipment and the receiver . Connect the equipment into an outlet on a circuit different from that
to which the receiver is connected. Consult the dealer or an exper ienced radio/TV technician for help.
Unauthorised changes or modification to this system can void the users’ authority to operate this equipment. This equipment requires shielded interface cables in order to meet FCC class B limit .
CLASS B NOTICE
This digital apparatus does not exceed the Class B limits for radio noise emissions set out in the Radio Interference Regulations of the Canadian Department of Communications.
CLASSE B AVIS
Cet appareil numérique ne dépasse pas les limites de la classe B au niveau des émissions de bruits radioélectriques fixés dans le Règlement de s signaux pa rasite s par l e ministère Cana dien d es Communications.
For the USA
For Canada
SAFETY CONSID ERA T
DO NO T O PEN. RE FER A LL SE RVICING TO QUALI FIED SER VICE PERSO NNE L.
TO REDU CE RISK OF FIRE/ELECTRIC SHOCK DO NOT EXPOS E THIS EQUIPMENT TO MOIST URE.
DO NOT A TTEMPT TO CHANGE OR TAMPER WITH THE SUPPLIED MAINS CABLES.
TO R EDU CE T H E R ISK O F FIRE REPL AC E T HE MAINS FUSE S ONLY WIT H A FUSE T H AT
CONFORMS TO IEC127-2 . 2 50 VO LT W OR KIN G, TIME DE LAY TYPE AND BO DY SIZE OF 2 0m m x
5mm . THE MAINS INPUT FUSE MUST BE RAT ED AT T31 5mA at 115V and T16 0mA at 315V.
CAUTION - SERVICING
WARNING
WARNING
WAR NING
IONS
In the interests of product development, Drawmer reserve the right to modify
or improve specifications of this product at any time, without prior notice.
MC2.1 - Monitor Controll er
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DRAWMER
CHAPT ER 1
MC2.1 Monitor Controller
With the Drawmer MC2.1 Monitor Controller incorporated into your system you combine the clarity, fidelity and transparency of th e highest quality monitoring circuit with the complexity of a host of mix checking features. It is versatile and intuitive, but above everything else, where the Drawm er MC2.1 excels is in it’s accuracy and ability to faithfully reproduce what has been recorded.
The MC2.1 incorp orates fo ur inputs with three stereo balanced speaker outputs, plus a dedicated mono speaker/sub-woofer output each with individual left/right trims under the u nit to provide complete control over level matching. T he active circuit has been designed to faithfully produce the audio signal whilst removing many of the problems that a passive circuit will bring. In addition, it has a host of mix checking features not often found on other controllers, such as individual left/ right c ut, as well as two separat e headphone amplifiers and a talkback fac ility, making the MC2.1 a true engineers tool. Drawmer MC2.1 Monitor Controller Features at a Glance:
Ultra low noise and transparent circuit design. Linear power supply with low hum toro id al transformer and internal voltage selector switch.
3 stereo balanced speaker outputs, plus a dedicated mono speaker/sub-woofer output. All have individual left & right trims under the unit to provide complete control over level matching.
Timed relay protection on all speaker outputs to prevent p ower u p/down bangs. Comprehensive mix checking facilities including Left/Rig ht Cut, Phase Reverse,
Mono, Dim, Mute. Paralleled custom quad pots on main and headph one level controls for exc ellent
chann el matching and smooth feel. Four inputs including balanced Neutrik XLR, balanced Neutrik XLR/JACK COMBI,
and shared aux p hono or 3.5mm jack. Two headpho ne amplifiers with individ ual level co ntrols.
Built in talk back microphone with level control, mono output jack and internal headphone routing.
Rugged steel chassis and stylish black brushed aluminium cover. Can be stacked and is rack mountable (using a 2U mounting kit).
Dimension s: L 272mm x W 215mm x H 81mm. W eight: 2.5kg.
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Wh ether you’re m astering a cd/dvd, recording, checking a mix for balance and e.q, doing A/B comparisons, plus a mu ltitude of other tasks, you’ll have spent weeks designi ng the perfect studio envir onment and a fortune on acti ve speakers , dynamics processors, various microphone and preamplifier combinations as well as a whole room full oth er gear, one thing is for sure - a monitor controller is central to every recording setup and probably the most important element of the entire signal chain - providing the ‘reference’ listening signal that enables the user to achieve the optimal mic placements, the perfect balance and EQ etc. There is one thing that should always be abso lutely guaranteed - that you can rely on the accuracy of your monitor controller.
It is imperative that what you’ve recorded is exactly what you hear - this is the philosophy that is at the heart of the design of the MC2.1. A monitor controller should certainly not degrade the quality of a recording in any way, but it should not artificially improve it either, otherwise how are you supposed to trust anyth ing that you’re recording. You may have come across the term WYSIWYG as used in web design - ‘what you see is what you get’ - we would like to thin k that the MC2.1 is the audio equivalent to this term - ‘What You R ecord Is W hat You Get’.
Active vs. Passive Circuits
Th ere is a great deb ate as to whic h is b est - a pass ive or act ive mon itor co ntr ol circuit. The theory is that passive monitor controllers must be best, sinc e th ey do not add transformers or other components to the signal p ath, along with the noise a nd dis t ort i on tha t t hey ca n br ing, howe ver they hav e severe dis advantages over active circuits. The most significant is that the output impedance of the connected source equipment and the input impedance of the power amp or active speaker will affect th e working s of the passive c ontroller - each needs buffering to remain r eliable and consistent, otherwise level matching problems will be inevitable. Since even the best cables have capacitance, it is extremely important to keep cable lengths to an ab solute min imum (i.e. less than a couple of meters) to avoid signal degradation especially in high frequency signals. Lo ng c able s will a ct lik e a sim ple lo w fr equ ency f ilter. Furthermore, it is incredibly difficult to get a m ono sig nal from a passive circuit without affecting the sound so any kind of reliable mix checking becomes near imp os sib le.
Active designs make it easier and more reliable to guarantee a high performance level as the signal attenuation and switching is actively buffered, as well as providing complete control over distortions, crosstalk, frequency response, and transient fidelity. Moreover, cable lengths of tens of meters should not be an issue. Fu rthermore, it makes it possible to introduce mix checking features th at would otherwise be missing. The disadvantage with active monitor con trollers 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 components and clever circuit design, with the Drawmer MC2.1 we have overcome all of these problems and managed to combine the best of both - whilst retaining the transparency and responsiveness that a passive circuit would bring with the advantages of an active one.
MC2.1 - Monitor Controll er
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DRAWMER
INSTALLATION
The MC2.1 is a free standing, desktop unit, with c ontrols and headphone jacks on the front panel and all other inputs and outputs on the rear. Multiple units can be stacked whilst sitting on the desk, however, the MC2.1 c an be screwed to the desk or into a stand ard 19” rack (using a 2U mounting kit).
Note that whether fixing to a desk or to a rack the speaker trims on the base of the unit will not be accessible and so the calibration procedure should be carried out before fastenin g the MC2.1 in plac e (see ‘Monitor Calibration’).
Screwing the MC2.1 to a desk.
Rather than having the MC2.1 free standing it can be fastened down to a desk by utilising the holes that hold the rubber feet to the underside.
Drill four holes into the desk, at 4mm in diameter and to the dimensions as sh own in the diagram. (Note th at the diagram is viewed fro m above).
Pushing four screws through the under-side of the desk screw the MC2.1, including the rubber feet, to the panel to secure. The screws should be M3 and have a length of 14mm plus the thickness of the panel.
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The MC2.1 unit will be sup plied with a power c ab le suitable for domestic power
POWER CONNECTION
outlets in your country. For your own safety, it is important that you use this cable to connect to the mains supply earth. The cable must not be tampered with or modified.
The power supply socket has an integral fuse drawer containing the power fuse of the same value, to suit the mains voltage for which the unit has been supplied. Removal of the drawer is only possible with the power cord removed. The fuse should never blow under normal operation. If the fuse is suspected of having blown, then a fault will have occurred and this fault condition should be inspected by a qualified service engineer. When replacing the fuse, always comply with the Safety Instructions.
If the unit is to be used with a mains input operating voltage different to that for which the unit is supplied, the following procedure must be carried out b y a techn ically competent p erson :
1: Disconnect the unit from the mains. 2: Using a number 1 size pozidrive screwdriver, remove the eig ht screws that
retain the top cover. Two screws are found along each side and four on the top. 3: W ith the cover removed slide the voltage change-over switch (S14) until the
correct (or nearest) mains input voltage is visible on the switch actuator. The switch is located to the top right of the main circuit board between the mains I.E.C. and toroidal transformer.
For conversion to 115V olt AC
(previously set to 230V olt AC).....
4a: Exchange the 160mA fuse below the mains socket for a similar type rated at 315mA
For conversion to 230Volt AC
(previously set to 115V olt AC).....
4b: Exchange the 315mA fuse below the mains socket for a similar type rated at 160mA
In all cases:
5: Repla ce the top cover usi ng the eight scr ews. 6: Re-connect to mains power source.
PORTABLE APPLIANCE TESTING
To undergo a Portable Appliance Testing proceedure (commonly known as "PAT", "PAT Inspection" or "PAT Testing") use any one of the screws that hold the feet to the bottom of the unit. These screws connect directly to the chassis and provide the earthing point. If required, the foot can be removed and the cavity probed, or the screw can be replaced for something more suited to the job, such as a spade terminal with a M3 thread.
MC2.1 - Monitor Controll er
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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 c onfiguratio n. The screens of the signal cables should be connected to the chassis connection on the XLR connector as opposed to connecting to pin1. The MC2.1 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 connectin g the o utputs of the MC2.1 to the patchbay. If such measures are necessary, balanced op eration is recommend ed.
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TYPICAL CONNECTION GUIDE
MC2.1 - Monitor Controll er
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DRAWMER
CHAPT ER 2
CONTROL DESCRIPTION
As well as a transparent and precise signal path the MC2.1 Monitor Controller incorporates many impressive features which are invaluable to the sound engineer when listening to and examining the quality of the audio:
Three stereo balanced speaker outputs, plus mono speaker/sub-woofer output. with individual level control for level matching.
Comp rehensive mix check ing facilities. Four simultaneously selectable inputs. Two headpho ne amplifiers with individ ual level co ntrols. Built in talk back microphone with level control, mon o output jack and internal
headphone routing.
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The MC2.1 Controls
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SOURCE
Three switches select which of I/P1, I/P2 and AUX is heard (see ). Each can be operated individually or simultaneously and in any combination. When operated simultaneously the individual signals are summed into a single stereo signal. Note that the MC2.1 does not provide in dividual level trims for the inputs and so any level matching should be applied before it reaches the MC2.1.
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SPEAKERS
Three switches select which of the three speaker outputs A (plus additional mono
output), B or C are heard (see ).
Each switch can be operated individu ally or simultan eously and in any combination and is perfect for performing A/B comparisons b etween various mo nitor setups. As the switches do not toggle between outputs when doing A/B comparisons both of those switches s hould be pressed at the same time i.e. to compare speakers A and C, with A active press both the A and C switc hes to swap the output to C active, and then again to r eturn to the previous setting - this method can be used between all three outputs if required. An additional benefit is derived when using a sub-bass. If the sub-bass is attached to output A, delivering the lower frequencies, outputs B and C could deliver the higher frequencies and allow for A/B (or in this c ase B+Sub/C+Sub ) comparisons between the two monitor setups by pressing the B and C switches simultaneously and leaving A always active.
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.
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MIX CHECKI NG
The mix checking section comes under two headings, Cut and Output, an d wh en used in conjunction with each other is a very thorough and versatile checking tool. Under the Output heading three switches have been incorporated provid ing Phase
Reverse, Mono and Dim. Phase Reverse : Inverts the polarity of the signal on the Left Channel and is used
primarily to outlin e 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 b ecome m ore apparen t and easier to id entify.
Mono: With the switch active both Left and Right stereo signals are combined into
a single mono signal. It is necessary when testing the audio to not only listen to the sign al in stereo but also in m ono. It helps to outline problems in the mix, but also when testin g for use on non-standard applications such as for broadcast or mobile phone.
Dim: With the switch active the output level is attenuated by 20dB’s. It enables you
to lower the volume without adjusting any of the settings.
MC2.1 - Monitor Controll er
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DRAWMER
Mix Checking cont....
Under the Cut heading three switches have been incorporated - Left Cut, Mute and
Right Cut. Left Cut: Mutes the Left channel signal allowing only the right signal to be h eard, Right Cut: Mutes the Right channel sign al allowing only the left signal to be heard, Mute: Cuts both channels (especially useful in an emergency). If Left Cut and Right
Cut ar e bo th act ive it is ju st th e same as M ute b eing ac tive. Note that Cut/Mute d oes no t aff ect th e he adp h one s ( see ) in th e sa me w ay as
it does the speakers (see ). With the Mute switch active the headph ones will still pass audio in just the same way as if it was off, th ey are not affected. This allows for someone to edit audio usin g headphones whilst a co nversation is occurring in the control room, for example.
Also, no te that, when activating 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/R ig ht Cut sound s a little mo re natural, after all, if listening throu gh speakers with only the left speaker active some of the signal well reach the right ear a few milliseconds later.
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HEADPHONES
The MC2.1 has two dedicated headphone outputs, via 1/4” TRS jacks, each with individual level control - Note that they have their own level control and are not affected by the main larg e m onitor volume knob.
In addition, note that th e headphones are not alw ays affected by the switches in the same way as the monitor outputs. The Source Controls (I/P1, I/P2 and Aux.) and
Output controls (Phase Rev, Mono and Dim) affect the headphones in just the
same way as the speakers, however, the Mute and L/R Cu t switch es affect th em differently (see above).
Warning:
It is advisable to unplug the headphones before switching the MC2.1 on or off. It is also recommended that you turn the headphone level down before inserting the jack, and turn it up to your desired listening level - these measures will not only prevent your ears from being damaged b ut also the headphone’s drivers. Also, note that these are high quality circuits and have been designed for professional headphones, so care must be taken when using lower standard, consumer quality headphones, such as earbuds or ipod phones etc, as damage could occur.
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TALKBACK
The MC2.1 has a dedicated talkback function including inbuilt microphone and gain level contr ol.
Talkback Switch: W hen active engages the inbuilt microphone and routes the
operator’s voice through the headphones and also to the output on the rear of the unit. The switch is non-latching and so must be held in to be active.
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Talkback Level. The knob adjusts the gain level of the talkb ack microphone. It can
be adjusted to compensat e for the di stance that the operat or is from the microphone, how loud his voice is, or the volume of the underlying music played, as well as several other factors.
TalkBack Microphone. An electret condenser microphone as been incorporated
into the MC2.1 and is located above the Talkback Level on the front panel. Activatin g the Talkback automatically eng ages the D im switch (i.e. attenuates the
volume by 20dB) for the headphones and also the speaker outputs making it possible for the artist to clearly hear the instruction.
As well as the headphones the talkback signal is also routed to the direct talkback output jack on the rear of the unit to be routed at the engineers discretion.
To operate talkb ack press the talkback switch and then turn the gain level up until all those wishin g to hear the operator’s voice can. Talkback is only active whilst the switch is held in and will de-activate once the finger is removed.
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MONITOR VOLUME
The Monitor Volume control adj usts the signal level of both stereo channels for all speaker outputs. The Vo lume knob affects the volume of the monitors A (plus the mono), B, & C only and does not have a bearing on any other output such as the headphones or talkback jack .
Because the circuitry is active it allows for the signal level to be increased, rather than only attenuated, making subtle problems with in the mix (such as noise at low levels, or unwanted harmonics, for example) more obvious and easier to iron out, especially during musical passages that would normally be quiet. The volume knob circuit design incorporates a parallelled custom quad potentiometer, for excellent channel matching and a smooth feel, with a range from Off (-infinity) to + 12dB of gain.
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Before you can make fu ll effective use of the Volume c ontrol it is necessary to calibrate the entire monitoring system (see the ‘Monitor Calibration’ section) - this allows for accurate level control, as well as left/right balance throughout the knob’s range. Note that the actual output levels, including the maximum output level and the position of unity gain (0d B) aro und the knob, will alter depending on the calibration of the monitors.
WARNING:
It is recommended that you turn the volume control down to a lo wer level before turning the MC2.1 off - this is to ensure that a sudden volu me increase when turning on does not damage your sp eak ers or your hearing In addition, do not use excessive force at either end of the volume knob - it’s size would mean th at damaging the potent iometer is possible.
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POWER LED
A lit 2mm LED indicates that the unit is switched on. To turn the MC2.1 on see the mains inp ut section .
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MC2.1 - Monitor Controll er
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DRAWMER
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INPUTS
The MC2.1 has four inputs comprising a I/P1 - a balanced Neutrik XLR, I/P2 - a balanced Neutrik XLR/jack combi (combining a 3 pole XLR receptacle and ¼" phone jac k in one XLR housing), and also AUX. - a shared input comprising of stereo RCA’s and a 3.5mm stereo jack. Each input is activated by the Source switches (see ) Note that AUX is a shared input and if both inputs are used simultaneously the signal w ill be summed into one stereo sign al, however level matching will need to be controlled prior to the MC2.1.
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OUTPUTS
Three stereo balanced speaker outputs- A, B and C, plus a dedicated mono speaker/ sub-woofer output - 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 mon itor level/room matching throug hout (see ‘Monitor C alibratio n’).
Each output is activated by the Spe akers switches (see ) - and can be activated individually or simultaneously and in any configuration.
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TALKBACK
A dedicate d ta lkback output can be found on the rea r panel, in the form of a ¼" jack, so that, as well as being routed through the headphones, a talkback signal can be routed to other devices at the engineers discretion. This could usually be patched into the live-room active monitor speakers for conven ience when recording acoustic ensembles where the performers may not wish or need to wear headphones. It could also be used as an added channel on a mixing desk to be patched into a multiple headphone amplifier alon g with the stereo mix, for example. The jack also allows for routing in to a separate channel of a DAW, or other recording facility, to allow for information overdubs to be added to a recordin g.
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MAINS I .E .C. AND POW ER SWI TCH
The mains inlet, I.E.C., which also incorporates the internal mains fuse, can be found on the rear of the unit. A mains lead will have been p rovided with the MC2.1 to suit the mains configuration for the country of yo ur purchase.
The power switch is located above the I.E.C. and is used to switch the unit on and off. This is a hard boot switch (as opposed to a soft stand-by switch) and so when in the off position the MC2.1 will draw no mains power.
Note that a timed relay protection circuit has been incorporated into the MC2.1 to prevent bangs and other potentially harmful artifacts from occurring during power up and power down.
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SPEAKER CALIBRATION TRIM CONTROLS
On the under-side of the MC2.1 there are seven rotary controls that allow the individual speaker level calibration of your system. Each speaker output has a control, including the mono/sub. To alter the speaker level use a small screwdriver to turn - counter-clockwise turns the speaker level down, and clockwise up.
For the calibration process see the “Monitor Calibration” section of this manual. Once the system has been c alibrated these trims should not be touched.
MC2.1 - Monitor Controll er
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DRAWMER
Wh ether you are installing on e, tw o or three sets of speakers it is imperative that your system is calibrated, not only to centre the stereo image and to ensure that all speaker levels are the same, but also to ensure that you are m ixing your music at industry standard listening levels. The MC2.1 can calibrate the speakers of any system as it has individu al ro tary level trim controls for every speaker attached (found on the under-side of the product).
The follo wing method is by no means the only way to calibrate your system, and a quick look on the internet will soon find many others, but is a good starting point.
Before begin ning the procedure there are a couple of things that you will require:
Sound Pressure Level (SPL) Meter: Unfortunately, it is virtually impossible to measure the level of sound from each speaker by ears alone. A good instrument that does a more accurate job is a Sound Pressure Level meter. SPL Meters come in two varieties: with an analog meter or with a digital display, either works well, just choose your prefered type. You can purchase an SPL meter from most electronic stores, or search the internet in stores such as Amazon, with pri ces rangi ng 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 mo re expensive SPL meter, suc h as Galaxy, Gold Line, Nady, etc. The ideal meter should have the industry standard “C­weighted” curve, slow setting. Refer to your meter’s manual to learn how to select these settings. If all else fails there are iph one/Android apps that claim to be SPL meters - whilst these are no-where near the quality of a dedicated meter they are better than nothing.
MONITOR CALIBRATION
Test files:
Test tones can either be generated through your DAW (such as the Signal Generator plug-in in Pro Tools), but you can also download test/calibration files from the internet if you search around: wav files are prefered to mp3’s due to the compression/limited frequency range of mp3’s. You c an also purchase good quality reference CD’s/DVD’s from various stores.
The tones required for this calibration process are:
1. 40Hz to 80Hz bandwidth limited pink-noise file reco rded at -2 0dBFS.
2. 500Hz to 2500Hz bandwidth lim ited pink-noise file recorded at -20dBFS.
3. Full-bandwidth pink-noise file recorded at -20dBFS.
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Holding the SPL - Set the meter to C weighted and on the slow scale. St art by sitting in your normal mixing position, hold the SPL m eter at arm’s length and at chest level with the microphone of the meter facing toward the monitor to be calibrated. Maintain this position throughout the calibration process - this could be easier if it is fixed via a stan d and brac ket, and m oved on ly to p oint at the relevan t sp eaker.
The following method sets the sound pressure 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 c an alter, essentially, the smaller yo ur 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.
Room Size
Cubic Feet
>20,000
10,000 to 19,999
5,000 to 9,999 1,500 to 4,999
<1,499
Listening at appropriate levels for your specific enviro nment will help maintain t he integrity of your mixes as they move from one system to another, in rooms of varying sizes.
Cubic Metres
>566 283 to 565 142 to 282
42 to 141
<41
SPL Reading
85dB 82dB 80dB 78dB 76dB
MC2.1 - Monitor Controll er
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The Procedure:
1. Begin by turning off the monitoring system and ensuring that all inputs and
spe akers ar e corr ectly co nnec ted.
2. Set all DAW/System controls to 0dB/unity gain - this should be left at this setting from now on. Remove all e.q. and dynamics from the signal path.
3. If you have active speakers with their o wn level control, or speak ers with an amplifier, set all of these to m aximum, so that they do not attenuate the signal.
4. On the underside of the MC2.1 yo u will find the speaker calibration trims - using a screwdriver initially set all of them to their full attenuation position by rotating each fully counter-clockwise. (See photo, opposite page).
5. Set the large volu me on the front of the MC2.1 to 12 0’c lock 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. Sele ct the requi re d Source on the f r ont of the MC2.1 - I /P1, I /P2 or AUX. You should not hear it, yet.
7. Activate the A Speaker by having only the Speaker A switch active in the speakers section on the front panel.
8. In order to hear only the Left A speaker remove the right speaker by activating the Righ Cut switch.
9. On the underside of the MC2.1 rotate the Left A trim clock-wise. You will now start to hear the sign al, but only for that speaker. Rotate until the SPL meter reads 85d B.
10. In order to hear o nly the Right A speaker switch in Left Cut and deactivate the Right Cut.
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1 1. On the underside of the MC2.1 rotate the Right A trim clock-wise until the SPL meter reads the desired level.
12. To calib rate each speaker rep eat steps 7 to 11 - replacing the speaker on step 7 for each set - A,B or C.
13. To calib rate the sub - play the 40-80Hz signal, but this time have only Speaker A active - Left and Right Cut need not be active as the frequency of the sig nal is limited to only the sub.
14. On th e u nderside of the MC2.1 increase the Mono trim increasing the volume of the sub until the desired SPL meter reading is reached.
15. Repeat steps 7 to 12 whilst playing the full b andwidth pink noise and adjusting to suit. The readings should be pretty clo se an d only require fine adjustment.
16. You are finished and the calibration p rocess has been c ompleted. The volume control will have a few dB’s of headroom so care must be taken to both
your hearing and system when increasing the volume passed the 12 o’clock position.
As with all things that are calibrated it’s a good idea to regularly check the calibration of your monitors to ensure that nothing has changed.
MC2.1 - Monitor Controll er
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Mix Ch ecking Tips
Due to the versatility of the MC2.1, and it’s thorough array of controls, some very useful techniques for checkin g your mix can easily be achieved, that can help improve the balance within a mix, pinpoint stereo width, phase and mono problems, and also aid when monogising.
The following are a few handy tips to help eradicate problems and bring about a balance within the mix:
Not t oo loud. ..
Give your ears a break. Do not have the volume too loud - frequent monitoring at anything above 90dB will only make your ears tired, mean ing that you won’t really hear the problems that may be occurring, and give you a false sense that the mix sounds nice and loud. Also, constant listening at anything above 100dB will probably have a long term detrimental effect on your hearing.
Shhhh...
Get into a habit of listening to your mix at very low levels quite often. Remember that not everyone listening to your song has music blasting out. As well as giving your ears a break, it will heighten problems in the mix - Do the key elements have a good balance, or are some instruments more prominent than they should 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 lou d.
Note that on the MC2.1 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.
Increase the Volume of Quiet Passages.
Because the MC2.1 circuitry is active it allows for the signal level to b e increased, rather than only attenuated, making subtle problems within the mix, such as noise at low levels, or unwanted harmonics, more obvious and easier to iron out, especially during passages that wo uld normally be quiet.
Here, There and Everywhere......
Listen to your mix on as many systems as possible. The three monitor outputs allows for the addition of a non standard testing setup i.e. the system could be forced to emulate low-quality domestic reproduction systems as well as car speakers or a portable radio, by incorporating limited-bandwidth speakers to output C. In such conditions you may find that an instrument drops out of the mix, or another is too prominent, an d adjustment to the mix n eed to be made. For best results calibrate the speakers to match the output level of the rest of the system.
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Cut It Out...
Using the left and right cut switches will highlight the stereo balance of each channel. In ster e o the mix sounds ok, however, it may be t hat you want an instrument to be panned so far left that it doesn’t occur at all in the right channel, by cutting the left and only hearing the right channel you will hear whether the instrument bleeds across, and panning ad justment can be made.
Phase Reverse...
Make use of the phase reverse switch. If the sound do esn't become less focussed when the p olarity is flipped then there is something wrong som ewhere. Not only will the switch help confirm that the monitor speakers are wired up in the correct polarity, phase inversion on a particular instrument can at times improve the way the instrument interacts with the rest of the mix by removing the phase cancellation.
Monogising
Check your mix in mono - often! Just because a mix sounds good in stereo doesn't mean it will sound good when the left and right channels are combined. Why should you care if your mix sounds good in mono? Well, most live music venues and dance club sound systems are mono - running the PA or sound system in mono is common practice to ensure music sounds good everywhere in the room because it removes the ‘sweet spot’ and the complex phase issues of stereo. In many cases the low frequencies will be put through a crossover and summed to mono before being sent to the sub, su ch as in a home theatre system, for example. Monogisin g is also necessary when testing the aud io for use on non -standard 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-filtering, which will colour the sound of your mix and cause peaks and dips in its frequency response. W hen a stereo mix is combined into mono any elements that are out of phase will drop in level or may even disappear c ompletely. T his could be because left and right outputs are wired out of phase but its more likely to be due to phase cancellation.
W hat causes phase c ancellation?
Many stereo widening effects and techniques, such as chorus;
Simultaneous direct box and mic recording - If you've ever recorded a guitar simultaneously through a direc t box an d a microphone, you may have noticed the time alignment problems this causes. This type of situation can often be fixed by careful mic placement, or realigning the waveform in a DAW;
Any situation where more that one microphone is used to record a source - on a multi-miked drumkit two mics may pick up exactly the same signal and cancel each other out. It may sound unlikely but one handy tip is to adjust the panning of your drums whilst in mono - suddenly all the phase cancellation of the drums will improve, and sound even better when reverted back to stereo.
MC2.1 - Monitor Controll er
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Listening in mono also highlights problems with the stereo width and balance of the mix and is more apparent when you use a lot of stereo-widening or width­enhancing techniques and tools. Switching mono in and out fairly quickly may make it apparent that the centre of the mix is shifting to the left or right, something that may go unno ticed if o nly working in stereo.
True Mono
As a mono signal would normally originate from a single source it would be wrong to simply activate the mono switc h - as both left and right speakers are still active. Wh en you listen to a mono signal on two speakers, you hear a false or 'phanto m' image which is derived mid way betw een th e speak ers, bu t becau se bo th sp eakers are contributing to the sound, the level of the bass seems to be over-inflated. To truly hear a monogised sig nal via on e speaker (the way everyone else will hear it) the mono switch should be active but also eith er Left Cut or Right Cut should also be activated (depending on preference/location) to derive the signal from a single location.
Listen to the ‘Stereo difference’ or side signal
A very useful facility of the MC2 .1 is the ability to listen to the ‘stereo difference’ or side signal, very quickly and easily. The side signal is the difference between the two channels, and describes those elements that contribute to the stereo wid th.
Hearin g the stereo difference is so simple using the MC2.1: with the stereo signal playing, activate the Phase Reverse switch, and then sum the left and right channel s using the Mono switch (in other words Left-Rig ht). It’s that 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 c hannels (such as cause d by an azi muth error on a tape machine) , or for aligning a pair of desk channels for use with X-Y stereo mic pairs. In both cases, listening for a deep canc ellation null, as the two signals cancel each other out, is a very fast and accurate way of matching levels in each ch annel, which is the basis of accurate alignment.
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MC2.1 GENERAL INFORMATION
IF A FAULT DEVELOPS
For warranty service please call Drawmer Electronic s Ltd. or their nearest authorised service facility, giving full details of the difficulty. A lis t of all main dealers can b e found on the Drawmer webpages. On receipt of this information, service or shipping instr uctions will be forwarded to you.
No equipment should be returned under the warranty wit hout prior cons ent from Dr awmer or th eir authorised represent ative.
For service claims under the warranty agreement a s ervice Return s Authoris ation (RA ) number will be is sued. W rite this RA number in large letter s in a prominent position on the shipping box. Enclose your name, address, telephone number, copy of the original sales invoice and a detailed des cripti on of the probl em.
Authorised returns s hould be prepaid and must be insured.
All Drawmer products are packaged in spec ially des igned contai ners f or prot ection . If the u nit is to be returned, the original container must be used. I f t his container is n ot available, then the equipment should be packaged in substant ial shock-proof material, capable of withstanding the handling for the transit.
CHAPT ER 3
SPECIFICA TION
Note: These specfications are provisional and may alter slightly upon product release.
INPUT
Maximum Input Level 21dB u
OUTPUT
Maximum Output Level before clipping 27dBu
DYNAMIC RANGE
@ unity gain 118dB
CROSS TALK
L/R @ 1kHz >85dB Adjacent Input >95dB
THD & NOISE
unity gain 0dBu input
0,0014%
FREQUENCY RESPONCE
20Hz-20kHz +/- 0.2dB
PHASE RESPONSE
20Hz-20kHz +/- 2degrees max
CONTACTING DRAWMER
W e will b e pleased t o answer all appl icati on qu est ions to en hanc e your us age of Dr awmer equipment .
Pleas e address c orrespond ence to:
DRAWMER Electroni cs LTD
Colem an Street Par kgat e Rotherham South Yorkshire S62 6EL United Kingdom
Telephone: +44 (0) 1709 527574 Fax: +44 (0) 1709 526871
Cont act via E- mail: tech@drawmer.com Further information on all Drawmer products,
dealers, Authoris ed service departments and oth er c ontac t inf ormat ion c an be f ound on our website: www.drawmer.com
MC2.1 - Monitor Controll er
POWER REQUI REME NTS
1 15V or 230V at 50- 60Hz , 20VA Voltage set by internal voltage switch
FUSE RATI NG
@ 1 15V T315mA @ 230V T 16 0m A Conforming to IEC 127-2
FUSE TYPE
20mm x 5mm, Class 3 Slo-Blo, 250Volt working
CASE SI ZE
Depth (with C ontrol s & Sockets) 272mm Width 215mm Height (with Feet) 81mm
WEIGHT 2.5kg
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DRAWMER
BLOCK DIAGRAM
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Ref:1v01E 08-04- 14
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