MASTER CONTROL

SILLITOE MM CUTTERHEAD AND MASTER CONTROL CUTTING AMPLIFIER FORM AN INTEGRATED ELECTROMECHANICAL SYSTEM FOR ACCURATE TRANSFER OF AUDIO SIGNAL TO GROOVE GEOMETRY.

DAC FRONT END

STANDARD VERSION MASTER CONTROL CUTTING AMPLIFIER EMPLOYS CLASS COMPLIANT USB DAC, PCM 44.1kHz – 384kHz 16-32 BIT (WITH GAIN CONTROL) FOR CUTTING FROM PERFECT GROOVE HOSTING CUTTERHEAD IMPULSE RESPONSE PRE-EMPHASIS.

WE HIGHLY RECOMMEND PERFECT GROOVE AS THE AUDIO SOURCE FOR BEST WORKFLOW AND RESULTS.

3RD PARTY DAW HOSTING CUTTERHEAD IMPULSE PRE-EMPHASIS IS POSSIBLE, (LIMITED SUPPORT & NO AUTOMATION AVAILABLE FOR 3RD PARTY OPTION).

NOTE- “FILTER SELECTOR” BUTTON SHOWN IN ABOVE IMAGE WILL CHANGE TO “INPUT SELECTOR” FOR STANDARD VERSION WITH DIGITAL INPUT UPGRADES.

OPTIONAL UPGRADES ARE AVAILABLE FOR THE AUDIO PATH.

ANALOG SIGNAL PATH

FOLLOWING DAC, AN ANALOG STAGE PROVIDES iRIAA & FEEDBACK SUMMING WHICH LEADS INTO 350WPC CLASS D AMPLIFICATION, L & R CURRENT METERING, TRANSDUCER PROTECTION FUSES AND TRUE BYPASS CUTTERHEAD MUTE.

THE “MONITOR” ROTARY SWITCH SELECTS BETWEEN FACTORY CALIBRATED VU & PEAK METERING OF “IN” SOURCE AUDIO INPUT, “FB” CUTTERHEAD FEEDBACK SIGNAL AND “PH” PHONO PLAYBACK FROM LATHE TONEARM (1KHZ 7CM / SEC REFERENCE LEVEL FOR 0dB).

“MONITOR” SWITCH ALSO SELECTS SOURCE OF MONITOR OUTPUT (REAR L & R XLR) BETWEEN FEEDBACK SIGNAL WHEN SET TO “FB”, OR PHONO PLAYBACK WHEN SET TO “IN” & “PH”.

PHONO PLAYBACK

THE MASTER CONTROL UNIT HOUSES A BALANCED STEREO PLAYBACK PHONO PREAMP FOR USE WITH THE LATHE MOUNTED TONEARM, SWITCHABLE (REAR PANEL) BETWEEN RIAA (COMPLIMENTARY CIRCUIT TO THE iRIAA ANALOG STAGE) AND FLAT (NO EQ APPLIED) FOR DOWNSTREAM DSP RIAA DE-EMPHASIS.

DAC UPGRADES

RECOMMENDED UPGRADE OPTIONS TO BE DISCUSSED WITH CLIENT.

1.1 OPTION FOR DIGITAL INPUT/S TO THE STANDARD VERSION DAC, PCM 44.1KHZ -192KHZ 16-24 BIT.

2.1 BALANCED ANALOG INPUT ADC-DSP-DAC. 

DSP GAIN, FILTERS AND CUTTERHEAD PRE-EMPHASIS EMBEDDED INSIDE THE MASTER CONTROL HARDWARE. DSP GAIN (-12dB / +12dB) AND FIR PRE-EMPHASIS WITH 3 SELECTABLE PRESETS FOR FLAT RESPONSE AND HP / LP FILTERING, (DSP BASED ACCELERATION LIMITER* UNDER DEVELOPMENT).

2.2 AES INPUT OPTION FOR DSP-DAC EMBEDDED INSIDE THE MASTER CONTROL HARDWARE.

SWITCH TO AES BYPASSES GAIN AND FILTER SELECTOR.

MASTER CONTROL ANALOG SIGNAL PROCESSING OPTIONS

INSERTS POST DSP / DAC, MAY NEED TO BE HOUSED IN AN EXTERNAL CASE DEPENDING ON CHOICES.

NOTE- WE RECOMMEND USING THE STANDARD SYSTEM CONFIGURATION WITH PERFECT GROOVE, HOWEVER, WE MAY ADD AN OPTION FOR ALL ANALOG SIGNAL PATH USING THIS INSERT POINT AS THE FRONT END.

ANALOG HPF & LPF.

ANALOG ELLIPTICAL EQUALISER.

ANALOG MID / SIDE & STEREO WIDTH.

MC PHONO STAGE, CLIENT CHOICE OF CARTRIDGE, CALIBRATED FOR PLAYBACK AND MONITORING.

HEADPHONE AMPLIFIER (FOR PLAYBACK MONITORING).

ADDITIONAL AUDIO PATH OPTIONS

ADC OPTIONS AVAILABLE FOR VINYL PLAYBACK TRANSFER INTO THE DIGITAL DOMAIN FOR ARCHIVING, CONSERVATION AND RESTORATION.

CUTTERHEAD

THE MM STEREO FEEDBACK CUTTERHEAD IS A MECHANICAL ARMATURE IN WHICH THE CUTTING TOOL (STYLUS) IS MOUNTED BETWEEN TWO ELECTROMAGNETIC TRANSDUCERS ARRANGED IN V2 MOTOR FORM.

FEEDBACK IS EMPLOYED VIA DISCRETE VELOCITY SENSE TRANSFORMERS TO NEGATE MECHANICAL SYSTEM RESONANCE FOR FLAT FREQUENCY & PHASE TRANSFER.

THE DESIGN, BUILD AND FACTORY CALIBRATION OF THE MM CUTTERHEAD & MASTER CONTROL CUTTING AMPLIFIER SUBSYSTEMS ENSURE A MECHANICALLY AND ELECTRICALLY TUNED SYSTEM WHICH OPERATES ACCURATELY OVER THE AUDIO BANDWIDTH IN TRANSFER OF SOURCE INPUT TO DISK & PLAYBACK OF DISK.

SILLITOE MODULAR DESIGN ALLOWS WARRANTY, SERVICE, SUPPORT AND REPAIR TO TAKE PLACE WITH MINIMAL DOWN TIME.

THE NOVEL MM CUTTERHEAD IS A DEPARTURE FROM TRADITIONAL DISK MASTERING TECHNOLOGY, PROVIDING BENEFITS IN POWER HANDLING EFFICIENCY & ROBUSTNESS WHICH ALLOWS THE ENGINEER TO PUSH LEVELS WITH CONFIDENCE.

DRIVE TRANSDUCER SERVICE AND REPAIR DOESN’T REQUIRE TIME CONSUMING & COSTLY MECHANICAL TEARDOWN AND REBUILD.

MOVING MAGNET SENSING TRANSFORMERS CANNOT BE DAMAGED DURING USE (EVEN IF THE SYSTEM WERE TO BE CALIBRATED INTO SELF OSCILLATION).

PROTOTYPE PERFORMANCE, FUNDAMENTAL MECHANICAL RESONANCE ~1.3kHz, SECOND RESONANCE (FEEDBACK APPLIED) ~11kHz.

WE AREN’T RELEASING PROTOTYPE FREQUENCY RESPONSE & CHANNEL SEPARATION SPECIFICATIONS UNTIL WE HAVE BUILT BATCHES.

PLEASE LISTEN TO & ANALYSE THE TEST CUTS (CONTACT FOR LINKS).