phase angle adjustment  in 0.1  steps
o
0.0006 rpm speed accuracy
global mains compatibility 90 to 265V 50/60 Hz
drive frequency adjustment in 0.001Hz steps
drive voltage adjustment in 0.1V steps
hall effect tacho speed calibration
precision 3ppm strobe system
dual 32bit ARM  processors 164Mhz 2.5ppm Clock
drives 2 motors up to 7 watts each
control freq
"Perfect Pitch" is the term used to describe a musicians ability to accurately tune his or her instrument. In the Orchestra, the First Violin or Concertmaster must tune to within less than one musical cent (< 1/100th of a semitone). In order to play in perfect harmony, the rest of the Orchestra must tune to the first violin with a similar degree of accuracy.
The Turntable Control Instrument project started with two very simple questions. Was it possible to design a turntable capable of achieving "Perfect Pitch"? Can a turntable that is incapable of reproducing absolute musical pitch even be considered a "high fidelity" device in the strictest sense of the word?
Even some of the most respected analogue turntables with the addition of sophisticated turntable power supplies, lack the speed accuracy to achieve anything like "Perfect Pitch". The best case accuracies of around 0.01% of rpm (100 ppm) are still far short of the mark. Capable of an absolute speed accuracy of 0.0006 rpm, the TCI is the only device currently manufactured able resolve absolute pitch to one quarter of a musical cent. It’s also the only turntable controller that allows you to adjust pitch in musical cents. Audiophile Piano Tuners of the World, Rejoice! The Control Freq  will transform your classic turntable into a true high fidelity Musical instrument.
PERFECT PITCH
perfect pitch and beyond
maths machine
The business end of the Control Freq is the waveform generator. Generating perfectly formed sinusoidal waveforms in perfect sync and perfect phase relationships is all about maths.
Serious Precision calls for serious math. The 8-bit microprocessor technology used in many other designs lacked the speed and precision to achieve the level of performance needed to meet our target specification.  
The breakthrough moment came with a design proposal from Australian based microcontroller developers Splat Controls. Their proprietary 32-bit ARM processor incorporating a Single Precision Maths Processor implemented in hardware provided the perfect development platform. Blindingly fast maths capability, true multitasking at machine code speeds. For the first time, "Perfect Pitch" is achievable with the majority of the world's classic belt drive turntables.  
the quiet revolution
find your voice
The vast majority of classic belt drive turntables are powered by a two phase AC synchronous motor. These motors were chosen because the speed of rotation is directly proportional to frequency of the mains supply, which at one time was reasonably constant at ~400ppm (.04%), while this made it easy to maintain a relatively constant speed, variations from location to location and time of day had a big impact on sonic performance. While the introduction of quartz locked power supplies partially addressed this problem and provided a more consistent stable frequency, most failed to address  the more sonically detrimental issue common to all synchronous motors in varying degrees that of torque ripple, mechanical vibration more commonly referred to as cogging.
Turntable manufacturers have used various electrical and mechanical techniques to reduce the level of this unwanted vibration. Over the course of a number of listening tests, using the CF to simulate these techniques it became clear that while a reduction in cogging vibration could be achieved, almost invariably, the dynamics and fine harmonic detailing were compromised. Attempting to mask a problem rather than fix a problem will always have its downside.
t
It has long been known among engineering circles that careful adjustment of the phase relationships within the motor can dramatically reduce cogging vibration, but to date only one turntable manufacturer has attempted this technique. The  Control Freq is the only device currently available that has the processor speed and precision maths capability to manipulate these phase relationships with the necessary degree of precision and long-term stability. The level of detail, clarity and dynamics achievable once this vibration is drastically reduced  rather than simply masked has to be heard to be believed.
 proprietary 32-bit ARM processor
When a concert pianist begins preparation for an upcoming performance, once the pieces to be performed are decided, the next task is to select the perfect instrument for that particular performance. This normally entails spending a few days at the nearest branch of Steinway & Sons. While Steinways reputation for building fine pianos is unsurpassed, no two Steinways sound exactly alike, each has subtle differences in tone, its own individual voice and only the performer can decide which specific instrument will best realise the sonic image in their mind.
find your own perfect sound
The Control Freq is unique in that it features two selectable setups for each speed. Straight out of the box or after calibration both the default and user speed selections hold the same data. Pressing and holding the "speed select” button  toggles between “default” and “user” setings which lets you adjust various motor parameters to find your own perfect sound. During playback you are able switch between the user and default settings for direct A-B comparison of the sonic effects of your adjustments. No other device offers this level of versatility. A number of sonic serving suggestions can be found in the "Cookbook" section of this website.
five year warranty
           Whether you’re a turntable owner or a turntable manufacturer, the Control Freq will help you find your perfect voice.
ultra precision turntable controller
choose your path
The Control Freq can be purchased with a number of output options which allow a number of levels of performance enhancement, each of which are dependent on the users personal technical capabilities or willingness to engage the services of a professional technician. The first level of performance is equivalent to basically every other product on the market. The controller is configured to provide a single phase AC output at either 120 or 240 V. With this option all that is required is to change the mains plug on the turntable, connect it to the controller and you're good to go. You now have all the advantages offered by any of our competitors. The next of the performance involves a slighty higher degree of technical intervention. With this option we would configure the controller to provide a dual phase (sine and cosine)  AC output. This option requires modification of the internal wiring of the turntable and the user needs to be either very confident in their knowledge and competence with mains level voltage circuits, or else is prepared to pay for a qualified technician to do the work. For a qualified technician this is a relatively simple procedure. Ex-factory, all classic belt drive turntables are fitted with a small circuit board which takes the mains sine wave signal and generates a cosine signal which is applied to the second winding of the motor. It uses a capacitor to generate a signal that is shifted in phase by 90° to create a revolving magnetic field within the motor. Virtually all of the classic belt drive turntables work this way. The problem with this industry-standard approach is that in our experience, because of variations in the design and manufacture of pretty much all of the synchronous motors used in turntables, the optimum phase angle for minimum vibration and maximum performance is almost never at exactly 90°. Implementing this option requires that the ex-factory circuit board be removed and replaced with our proprietary circuit board and cable assembly. This option gives the user extremely precise control of the phase angle between the two windings of the motor and depending on the particular motor used in the turntable, this option will either greatly reduce or in some cases completely eliminate the copying vibration from the motor resulting in dramatic sonic improvements in fine detail and dynamics. While performance gains will vary depending on the type of motor used, this option will provide dramatically obvious gains in performance that are simply not achievable with other products currently on the market. Which brings us to Option Three, this is where things get a little extreme. The Control Freq as a unique ability to drive two 24VAC motors with absolute and precise control of all three motor parameters. For those interested in experimental or commercial turntable development, the controller option allows you to drive two motors up to 7 watts each in perfect synchronisation. We have exclusive arrangements with a number of the principal suppliers of turntable motors around the world and can supply additional motors for your turntable experiment. Our engineering staff are available to provide custom outputs for less commonly used motors, we currently have under development a three-phase output module and motor which will be the ultimate in high torque zero vibration motor technology. We have the engineering smarts paired with economical short run production facilities to realise your dream. So choose your path, the only limits are in your imagination.
compare products
PHOENIX FALCON LINN LINGO PROJEKT SPEEDBOX MUSICHALL NUMBER 9 CRUISE CONT. VPI SDS PRICE TECHNOLOGY OUTPUT POWER ADJUSTMENT RESOLUTION CLOCK ACCURACY CALIBRATION MODES 100 ppm 2.5 ppm 100 ppm 100 ppm 100 ppm 100 ppm 100 ppm 0.0006 rpm 7 W 5 W 3W 3 W 20 W 0.1 rpm 3 W CF $US 599 $US 479 $US 299 $US 1199 $US 1810 $US 1255 HYBRID 8 BIT DDS 0.1 rpm 0.01 rpm PHASE ADJUSTMENT x x x x x x x x +- 90 deg in 0.1 deg increments 3rd Party Strobe 3rd Party Strobe x 3rd Party Strobe 3rd Party Strobe x FALCON/ ROADRUNNER 5 W TURNTABLE DRIVE SYSTEM COMPARISON $US 858 Tacho x x x x x SINE & COS OUTPUT INPUT VOLTAGE 16VAC 120VAC SE 115VAC 115VAC OUTPUT VOLTAGE 50Hz  60Hz OPERATION x or Tacho UNIVERSAL 90 - 300VAC UNIVERSAL 90 - 300VAC UNIVERSAL 90 - 300VAC WALLWART WALLWART 16VAC 16VAC 16VAC 120VAC 240VAC 240VAC 120VAC FACTORY OPTION FACTORY OPTION FACTORY OPTION x x USER SELECTABLE USER SELECTABLE USER SELECTABLE FIXED PHASE ANGLE 120VAC 120VAC 32 BIT DDS D/A HYBRID D/A 0.01 rpm 0.01 rpm 3 ppm Precision Strobe 8 BIT PWM 8 BIT DDS 8 BIT PWM TWO MOTORS SUPPORTED x x x x x x 16 - 24VAC PITCH CONTROL x FREQUENCY ADJUST 20 STEPS OF 0.1 RPM FREQUENCY ADJUST 20 STEPS OF 0.1 RPM +/- 1 RPM 0.1 STEPS USB SERIAL  LCD DISPLAY x USER INTERFACE LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON +/- 1 RPM 0.1 STEPS E&OE
NAVIGATION
UK & USA residents can call via Skype for the cost of the local call. We are available Mon-Fri between 10am and 5pm AEST. (GMT+10) It is currently:
contact us
in Melbourne, Australia
control freq
"Perfect Pitch" is the term used to describe a musicians ability to accurately tune his or her instrument. In the Orchestra, the First Violin or Concertmaster must tune to within less than one musical cent (< 1/100th of a semitone). In order to play in perfect harmony, the rest of the Orchestra must tune to the first violin with a similar degree of accuracy.
The Turntable Control Instrument project started with two very simple questions. Was it possible to design a turntable capable of achieving "Perfect Pitch"? Can a turntable that is incapable of reproducing absolute musical pitch even be considered a "high fidelity" device in the strictest sense of the word?
Even some of the most respected analogue turntables with the addition of sophisticated turntable power supplies, lack the speed accuracy to achieve anything like "Perfect Pitch". The best case accuracies of around 0.01% of rpm (100 ppm) are still far short of the mark. Capable of an absolute speed accuracy of 0.0006% rpm, the TCI is the only device currently manufactured able resolve absolute pitch to one quarter of a musical cent. It’s also the only turntable controller that allows you to adjust pitch in musical cents. Audiophile Piano Tuners of the World, Rejoice! The Control Freq  will transform your classic turntable into a true high fidelity Musical instrument.
PERFECT PITCH
perfect pitch and beyond
maths machine
The business end of the Control Freq is the waveform generator. Generating perfectly formed sinusoidal waveforms in perfect sync and perfect phase relationships is all about maths.
Serious Precision calls for serious math. The 8-bit microprocessor technology used in many other designs lacked the speed and precision to achieve the level of performance needed to meet our target specification.  
The breakthrough moment came with a design proposal from Australian based microcontroller developers Splat Controls. Their proprietary 32-bit ARM processor incorporating a Single Precision Maths Processor implemented in hardware provided the perfect development platform. Blindingly fast maths capability, true multitasking at machine code speeds. For the first time, "Perfect Pitch" is achievable with the majority of the world's classic belt drive turntables.  
the quiet revolution
find your voice
The vast majority of classic belt drive turntables are powered by a two phase AC synchronous motor. These motors were chosen because the speed of rotation is directly proportional to frequency of the mains supply, which at one time was reasonably constant at ~400ppm (.04%), while this made it easy to maintain a relatively constant speed, variations from location to location and time of day had a big impact on sonic performance. While the introduction of quartz locked power supplies partially addressed this problem and provided a more consistent stable frequency, most failed to address  the more sonically detrimental issue common to all synchronous motors in varying degrees that of torque ripple, mechanical vibration more commonly referred to as cogging.
Turntable manufacturers have used various electrical and mechanical techniques to reduce the level of this unwanted vibration. Over the course of a number of listening tests, using the CF to simulate these techniques it became clear that while a reduction in cogging vibration could be achieved, almost invariably, the dynamics and fine harmonic detailing were compromised. Attempting to mask a problem rather than fix a problem will always have its downside.
t
It has long been known among engineering circles that careful adjustment of the phase relationships within the motor can dramatically reduce cogging vibration, but to date only one turntable manufacturer has attempted this technique. The  Control Freq is the only device currently available that has the processor speed and precision maths capability to manipulate these phase relationships with the necessary degree of precision and long-term stability. The level of detail, clarity and dynamics achievable once this vibration is drastically reduced  rather than simply masked has to be heard to be believed.
 proprietary 32-bit ARM processor
When a concert pianist begins preparation for an upcoming performance, once the pieces to be performed are decided, the next task is to select the perfect instrument for that particular performance. This normally entails spending a few days at the nearest branch of Steinway & Sons. While Steinways reputation for building fine pianos is unsurpassed, no two Steinways sound exactly alike, each has subtle differences in tone, its own individual voice and only the performer can decide which specific instrument will best realise the sonic image in their mind.
find your own perfect sound
The Control Freq is unique in that it features two selectable setups for each speed. Straight out of the box or after calibration both the default and user speed selections hold the same data. Pressing and holding the "speed select” button  toggles between “default” and “user” setings which lets you adjust various motor parameters to find your own perfect sound. During playback you are able switch between the user and default settings for direct A-B comparison of the sonic effects of your adjustments. No other device offers this level of versatility.
phase angle adjustment  in 0.1  steps o 0.0006 rpm speed accuracy global mains compatibility 90 to 265V 50/60 Hz drive frequency adjustment in 0.001Hz steps drive voltage adjustment in 0.1V steps hall effect tacho speed calibration precision 3ppm strobe system dual 32bit ARM  processors 164Mhz 2.5ppm Clock drives 2 motors up to 7 watts each five year warranty
Whether you’re a turntable owner or a turntable manufacturer, the Control Freq will help you find your perfect voice.
ultra precision turntable controller
choose your path
The Control Freq can be purchased with a number of output options which allow a number of levels of performance enhancement, each of which are dependent on the users personal technical capabilities or willingness to engage the services of a professional technician. The first level of performance is equivalent to basically every other product on the market. The controller is configured to provide a single phase AC output at either 120 or 240 V. With this option all that is required is to change the mains plug on the turntable, connect it to the controller and you're good to go. You now have all the advantages offered by any of our competitors. The next of the performance involves a slighty higher degree of technical intervention. With this option we would configure the controller to provide a dual phase (sine and cosine)  AC output. This option requires modification of the internal wiring of the turntable and the user needs to be either very confident in their knowledge and competence with mains level voltage circuits, or else is prepared to pay for a qualified technician to do the work. For a qualified technician this is a relatively simple procedure. Ex-factory, all classic belt drive turntables are fitted with a small circuit board which takes the mains sine wave signal and generates a cosine signal which is applied to the second winding of the motor. It uses a capacitor to generate a signal that is shifted in phase by 90° to create a revolving magnetic field within the motor. Virtually all of the classic belt drive turntables work this way. The problem with this industry-standard approach is that in our experience, because of variations in the design and manufacture of pretty much all of the synchronous motors used in turntables, the optimum phase angle for minimum vibration and maximum performance is almost never at exactly 90°. Implementing this option requires that the ex-factory circuit board be removed and replaced with our proprietary circuit board and cable assembly. This option gives the user extremely precise control of the phase angle between the two windings of the motor and depending on the particular motor used in the turntable, this option will either greatly reduce or in some cases completely eliminate the copying vibration from the motor resulting in dramatic sonic improvements in fine detail and dynamics. While performance gains will vary depending on the type of motor used, this option will provide dramatically obvious gains in performance that are simply not achievable with other products currently on the market. Which brings us to Option Three, this is where things get a little extreme. The Control Freq as a unique ability to drive two 24VAC motors with absolute and precise control of all three motor parameters. For those interested in experimental or commercial turntable development, the controller option allows you to drive two motors up to 7 watts each in perfect synchronisation. We have exclusive arrangements with a number of the principal suppliers of turntable motors around the world and can supply additional motors for your turntable experiment. Our engineering staff are available to provide custom outputs for less commonly used motors, we currently have under development a three-phase output module and motor which will be the ultimate in high torque zero vibration motor technology. We have the engineering smarts paired with economical short run production facilities to realise your dream. So choose your path, the only limits are in your imagination.
compare products
PHOENIX FALCON LINN LINGO PROJEKT SPEEDBOX MUSICHALL NUMBER 9 CRUISE CONT. VPI SDS PRICE TECHNOLOGY OUTPUT POWER ADJUSTMENT RESOLUTION CLOCK ACCURACY CALIBRATION MODES 100 ppm 2.5 ppm 100 ppm 100 ppm 100 ppm 100 ppm 100 ppm 0.0006 rpm 7 W 5 W 3W 3 W 20 W 0.1 rpm 3 W CF $US 599 $US 479 $US 299 $US 1199 $US 1810 $US 1255 HYBRID 8 BIT DDS 0.1 rpm 0.01 rpm PHASE ADJUSTMENT x x x x x x x x +- 90 deg in 0.1 deg increments 3rd Party Strobe 3rd Party Strobe x 3rd Party Strobe 3rd Party Strobe x FALCON/ ROADRUNNER 5 W TURNTABLE DRIVE SYSTEM COMPARISON $US 858 Tacho x x x x x SINE & COS OUTPUT INPUT VOLTAGE 16VAC 120VAC SE 115VAC 115VAC OUTPUT VOLTAGE 50Hz  60Hz OPERATION x or Tacho UNIVERSAL 90 - 300VAC UNIVERSAL 90 - 300VAC UNIVERSAL 90 - 300VAC WALLWART WALLWART 16VAC 16VAC 16VAC 120VAC 240VAC 240VAC 120VAC FACTORY OPTION FACTORY OPTION FACTORY OPTION x x USER SELECTABLE USER SELECTABLE USER SELECTABLE FIXED PHASE ANGLE 120VAC 120VAC 32 BIT DDS D/A HYBRID D/A 0.01 rpm 0.01 rpm 3 ppm Precision Strobe 8 BIT PWM 8 BIT DDS 8 BIT PWM TWO MOTORS SUPPORTED x x x x x x 16 - 24VAC PITCH CONTROL x FREQUENCY ADJUST 20 STEPS OF 0.1 RPM FREQUENCY ADJUST 20 STEPS OF 0.1 RPM +/- 1 RPM 0.1 STEPS USB SERIAL  LCD DISPLAY x USER INTERFACE LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON LED DISPLAY PUSH BUTTON +/- 1 RPM 0.1 STEPS E&OE
UK & USA residents can call via Skype for the cost of the local call. We are available Mon-Fri between 10am and 5pm AEST. (GMT+10) It is currently:
contact us
in Melbourne, Australia