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Sound Skulptor MC624 User manual
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1. the output is the difference left right DIM attenuates the output by an amount of dB defined in Functions Setup default 20dB LEVEL Sets the monitoring output level It is also used to set up parameters PHONES Sets the phone level independent of the monitoring level Ol switch Power switch 6 Input setup A long press on an INPUT switch starts setup of the corresponding input The LED blinks when you enter the setup mode There are 3 settings that you can cycle through by pressing again on the same switch The values are adjusted by the LEVEL knob You leave the setup mode by pressing any other switch mw w o w O W FIL Fees LI LI Ler a Blinking between OFS and value Adds an offset between 2 and 12 dB to the input signal Balanced unbalanced Must be set accordingly to the input type Low gain for 4dBu input High gain for OdBV input Must be set accordingly to the iipuUL level LU EEIT fa Output setup A long press on an OUTPUT switch starts setup of the corresponding output The LED blinks when you enter the setup mode There are 2 settings 3 for output 4 that you can cycle through by pressing again on the same switch The values are adjusted by the LEVEL knob You leave the setup mode by pressing any other switch Fir LI 8 D D Blinking between OFS and value Adds an offset between 2 and 12 dB to the output signal Balanced unbalanced Must be set accordingl
2. CZ56 N2 3 RZ NZ155 RZL6 Copyright 2014 SoundSkulptor
3. plugs follow the typical scheme Tip Hot Ring Cold Sleeve Shield Connect the 2V power adapter to the DC IN connector There are 2 headphones output one on the front panel and one on the back panel These outputs are derived trom the same amplifier The Meter out output lets you connect a buttered meter pair or can be used as a record output The link connectors allows linking several units together They use a standard USB connector but cannot be connected to other USD devices The ground thumb nut is used to connect the chassis to ground if needed Ji Front panel commands INPUT SELECT Pressing one of the six push switches selects the corresponding input and sends it to the selected Copyright 2014 SoundSkulptor www soundskulptor com Document revision Last modification 20 10 14 output and to the Meter Output Inputs are mutually exclusive OUTPUT SELECT Pressing one of the four push switches sends the selected input to the corresponding output Outputs are exclusive except output 4 which can be set as a SUB output and activated in addition to one of the first three MUTE Turns off the monitor output signal but not the Meter Output neither the headphone output LIR Mutes the left and right channels alternatively Unmuting is done by pressing the MUTE switch MONO Sums the left and right channels and sends the result to both DIFF Inverts the phase of the right channel When DIFF and MONO are both activated
4. annoying the PCB has provision for inserting a OOuf 6V bipolar capacitor on every input and output which will eliminate any offsets The outputs also receive an additional resistor when the capacitor is inserted If you want to do this modification you must first determine which input or output is responsible for the clicking It will keep clicking when all other inputs or outputs are disconnected from external devices Then from the table below find out the reference of the 2 or 4 capacitors and resistors connected to this input or output There are 2 caps for a balanced signal one for an unbalanced signal 2 times for stereo The optional capacitors are labelled Cz to Cz36 the resistors are labelled Rz to Rzl 6 Identity the caps and resistors positions on the PCB Before soldering the caps you must cut the small track on the solder side of the PCB that connects the 2 pads of the cap shown by red arrows in the picture Use a small and sharp cardboard knife Input Cz 22 007 I Cz 2 Input 2 CZ 024 C2 0 024 Copyright 2014 SoundSkulptor www soundskulptor com Document revision I I Last modification 20 10 14 Input 3 Cz5 Cz6 Czl5 zle Input 4 CZCZO Cal CZK Input 5 Gah 2109 Input 6 CzlO Cz20 Output C22 ls GzZ22 C220 C250 Reis R22 RZY RTO Output 2 2 ZOZ SZOSA 27 R le ZA Output 3 CZE x CZE C2904 CRR RZ RZE R21 RIA Output 4 C22 l C220 C295
5. ayed value This is only cosmetic and has no effect on the output level When set to 63 default the displayed value represents the attenuation and goes from 63 to O O being the loudest When set to O the displayed value represents a level that goes from O to 63 63 being the loudest You can set a different value that will show O for your preterred reterence listening level and display positive or negative values from there Headphone low gain headphone high gain Sets two different gains on the headphone amplifier to better match different headphone sensitivities Master Slave The normal mode is Master The Slave mode is used when using several MCG24 for surround One unit is set to master all the other units are set to Slave Remote control learning mode The LEVEL knob lets you step through all the available commands For each command you must press the desired TV remote button When the new IR code is learned the display stops blinking The available commands are nl nput n2 input 2 nS nput 3 n4 input 4 no nput 5 ne lnput 6 Mute Mute left Mute right Mono Difference inverts the right channel Dim Output to Output 4 Volume up generally tied to the level up of the remote control Volume down generally tied to the level down of the remote control input channel up generally tied to the program up of the remote control www soundskulptor com Document revision La
6. eee CER setu INPUT 6 ESSEC Key set MC624 Monitor Controller ESI PHONES 2 Design considerations The design objective has been to put as little electronics as possible between input and output The total passive approach was ruled out because of the stress it puts on the audio sources increasing distortion when you want to achieve a low enough output impedance necessary for the noise immunity So we opted for a unity gain butter optionally switch able to provide the 2dB of gain necessary tor the semi pro OdBV compatibility The buffer used is one the best op amps available today speced distortion at 0 00008 This buffer is the sole active component in the signal path Copyright 2014 SoundSkulptor www soundskulptor com Document revision l Last modification 20 10 14 SKUIpCor The circuit is fully ditterential throughout and there is no capacitor in the signal path All the switching is done by relays The butter feeds a passive precision logarithmic ladder attenuator that is also switched by relays The headphone amplitier is also a very nice design with extremely low distortion very high bandwidth and high drive capability 2 Back panel connections GND HEADPHONE L OOO 7 SE o ool R DC IN 12V DIMIN OUT 4 OUT3 L OUTPUT 2 L OUTPUT 1 The back panel carries the following connectors from right to left e input 2x XLN line level balanced or unbalanced e i
7. nput 2 2x XLR line level balanced or unbalanced e input 3 2x 1 4 jack line level balanced or unbalanced e input 4 2x 1 4 jack line level balanced or unbalanced e input 5 2x RCA cinch line level unbalanced e input 6 2x RCA cinch line level unbalanced paralleled with the front panel 3 5mm jack lt Meter out 2x 1 4 Jack is a line level 4dBu output taken after the input selector and buffer It can be used for connecting a buttered meter or used as a record output e output 2x XLN line level balanced or unbalanced e output 2 2x XLN line level balanced or unbalanced e output 3 2x 1 4 jack line level balanced or unbalanced e output 4 2x 1 4 Jack line level balanced or unbalanced e Headphone output Top lx 1 4 jack e Dim input Bottom lx 1 4 jack is an input that activates the DIM function The activation is done by connecting the tip and the ring of the jack by a switch The purpose ot this input is to be connected to a Talkback switch Link connectors 2x USB connected m parallel used to link several units tor surround monitoring e DC IN needs a good quality 2V 25W power adapter Ground Use tor tying the case to the general ground if necessary 4 Installation Connect inputs to your source signals and outputs to your various amplified monitor pairs The XLR plugs follow the typical scheme Pin Shield Pin 2 Hot Pin 3 Cold The jack
8. st modification 20 10 14 B Ci input channel down generally tied to the program down of the remote control as Do nothing restore factory settings Pressing any switch when on CLR resets the i device memory to the factory setting lO IR remote control The MCG24 can be remote controlled by almost any TV remote We recommend the One for All model 960 because we tested it and it feels solid but many other will do The MCG24 is preset to work with the Sony 1625 or 16591 settings on the 7960 remote BE Surround Several units can be linked together through the dual USB connector at the back The two connectors are wired mn parallel allowing connecting 2 3 or more units Connection is done with a type A A USB cable You must set one master unit and several slave units in the System Setup The master unit transmits all the input output level commands from its front panel or IR remote to the slave units The slave units also respond to their own front panel commands but these are reset as soon as the master receives and torwards a new command The Mute L R MONO and DIFF commands are not forwarded by the master They can be set locally on each unit 12 Clicks immunity Because the MC624 passes DC you might hear some clicks when switching inputs if one of the sources presents some DC offset on its output Same thing when switching outputs if one of the monitors has a DC offset on its input If the clicks are too
9. www soundskulptor com Document revision Last modification 20 10 14 Sound Skulptor MCG24 User manual Overview The MC624 lets you select one out of six stereo line level audio sources adjust the level and route it to one out of four stereo amplified monitor pairs The level can be set m very accurate dB increments It gives you the possibility to listen to normal stereo right only left only left right mono left inverted right left right diiference dimmed and mute Each input can be configured tor balanced or unbalanced OdBV or 4dBu level and an offset can be added if needed tO correct input level ditterences Each output can be coniigured for balanced or unbalanced and an offset can be added if needed to correct output level differences Output 4 can be set as a Dub output An infra red detector allows controlling the MCG624 from an ordinary TV remote Several units can be linked together for surround One unit is the master and controls the other units LEFT RIGHT a ee 4 8 INPUT 1 N C C METER OUT o 04 cy 4 i TPUT 1 INPUT 2 l ey OUTPU INPUT 3 MUTE LEFT 0 64dB Ty wy OUTPUT MUTE RIGHT PASSIVE LP KJ LEFT RIGHT LM INVERT RIGHT P aad INPUT 4 g O OUTPUT 4 INPUT 5 lt 4 2 z ko m z gt 4 lt S e INPUT6 at e o MORGGOWMO ER 0 Sound Skulptor 5 gg MUTE L R MONO DIFF DIM dt CC a a a a E j
10. y to the monitor input type Normal output Sub only on output 4 When set to Sub the output 4 is switched in aaaicioh to thie other to 3 Selected output IV is Used to Switch aSub bass Output The sub output is wired in parallel to the selected output so it cannot have its own offset and bal unb mode Functions setup The functions setup allows you to set an offset for Mono 12 to I 2dB and Diff 2 to 24dB and to define the attenuation of Dim O to 634B Initiate setup by a long press on the switch corresponding to the function you want to set The LED starts blinking when you enter the setup mode The values are adjusted by the LEVEL knob You leave the setup mode by pressing any other switch Copyright 2014 SoundSkulptor www soundskulptor com Document revision Last modification 20 10 14 Blinking between OFS and value Set the desired offset to the function 3 System setup Initiate the system setup by pressing simultaneously on the Mute and Dim switches The 2 LED s start blinking when you enter the setup mode There are 5 settings that you can cycle through by pressing again on one of the same switches The values are adjusted by the LEVEL knob You leave the setup mode by pressing any other switch m LI rr LJ Co LI r J a M A DL cod Copyright 2014 SoundSkulptor Blinking between OFS and value Subtracts an offset between O and 63 dB to the displ
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