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AfterDark. Project ClayX GIESEMANN OCXO 10MHz Trifecta iClock Mini

Grade vs Phase Noise@10Hz
Audiophile 10M Master Clock

AfterDark. Project ClayX GIESEMANN OCXO 10MHz Trifecta iClock Mini

The new developement of Giesemann OCXO iClock Mini for Silent Angel Boon NX / N8 Pro Network Switch  

This version is designed along with customer who is recently purchase the Silent Angel Network Switch for his audiopile sysytem. Since Silent Angel Boon NX is requires a specific frequency to work. He contact AfterDark. and see if we design and develop a OCXO Clock which is small in size to optimises the Newtork Switch with different Word Clock Frequency and output 10M Master Clock outputs for sync with both devices for the Silent Angel Boon NX as well as Silent Angel N8 Pro Network Switch. 

We know thare are customer using Silent Angel Streaming and Network Switch system. They are very keen on improving the existing device with external clock with Giesemann OCXO Reference 10M Master Clock. In additions with 2 x Word Clock, they request one more 10M Master Clock ouputs signals for other devices which accepting 10M Master Clock. 



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What is the design concept of Giesemann OCXO iClock Mini?

  • The outputs signal will be in Square Wave, 75 Ohms with isolated with 3 outputs BNC Connectors.
  • Each of the outputs can be adjusted and factory preset to various frequency
  • The chassis is rigid, heavy weighted and fine tuned with Carbon Fiber for EMI protection and ensure highest stability of OCXO inside
  • Accepting external audiophiles LPS (Linear Power Supply) for demanding applications and optimised for OCXO Master Clock
  • The dimension will be the same as Giesemann OCXO Single Output Version. 
  • The color of chassis is in black color
  • Plug and Play compatibilty for Silent Angel's customers 


What is the DC input required for Giesemann OCXO iClock Mini

  • Accepting external LPS with 15V DC at 2A
  • The external DC plug standard is 2.1mm/5.5mm. 


What is the special when we design the power section inside the Giesemann OCXO iClock Mini?

  • By using LT3045s in parallel to spread the current, it is designed for very high PSRR.
  • iClock Mini will equiped with Four LT3045 in parallels to ensure Ultra High PSRR (Power Supply Rejection Ratio), this ensure the high ability to remove power supply ripple, if any, on the input external power supply 
  • This ensure highest Audio performance on OCXO with lowest derivation on Phase Noise and Allan Derivation 



Why it is important to use external Master Clock for Network Switch?

  • This is a night and day difference, and Master Clock unlock the full potential on Network Switch 
  • Giesemann Clock is the heart of any digital audio system. It sets the tempo of all the digital pieces of audio equipment in a audiophile system.
  • Based on ultra high precision, the Giesemann clock OCXO is extreme low in phase noise in 1Hz and 10Hz interval. It brings the pivotal timing accuracy that enable DAC, Music Streamer and any audiophile network switch products equipped with a SYNC input of Master Clock to function optimally.


What is the different between Silent Angel N8 PRO-CLK and N8 RRO?

  • - N8 PRO-CLK (with an 10MHz external Word Clock input)
    - N8 PRO (without external Word Clock input)


Can I upgrade the N8 PRO to use with external 10Mhz external Master Clock Input?

  • Yes, AfterDark. can provide modification service for this upgrades




For Silent Angel Bonn NX network switch , the device are accepting 1 inputs of Word Clock as below:

  • 1 x Word Clock Inputs on BNC connectors, accept special Word Clock frequency at 25Mhz. 
  • To achieve the best possible clocking frequency, we use the highest grade of from Giesemann OCXO Master Clock to generate the Word Clock at 25Mhz. 



Performance upgrade with use of the external OCXO optimised with Word Clock at 25Mhz.


For Silent Angel Bonn N8 Pro - CLK network switch , the device are accepting 1 inputs Master Clock as below:

  • 1 x Master Clock Inputs on BNC connectors, accept frequency at 10M.  
  • To achieve the best possible clocking frequency, we use the highest grade of from Giesemann OCXO Master Clock to generate the Reference Master Clock at 10M. 






Performance upgrade with use of the external OCXO optimised with Reference Master Clock at 10Mhz.




What is the range of Giesemann OCXO grade can be choose?

  • All grades of Giesemann OCXO from Prince to Emperor Giesemann EVA can be made to order for customers


What is the specification to determined the Quality of OCXO?

  • They can be graded by Phase Noise when compared the measurement result on both 1Hz / 10Hz intervals.
  • Phase noise: -119 to -113 dBc / Hz or lower at 1 Hz offset (Grades) -137 dBc / Hz or lower at 10 Hz offset


GRADE Phase Noise@ 10Hz Phase Noise@ 1Hz
PRINCE -131 -100
QUEEN -132 -103
KING -134 -107
Emperor Signature  -138 -110
Emperor CROWN -140 -113
Emperor DOUBLE CROWN -141 -117
Emperor TRIPLE CROWN -142 -118
Emperor Giesemann -143 -120
Emperor Giesemann EVA -145 -121


Allan variance short-term stability reference value

[Emperor Giesemann EVA]TAU = 1sec 2.50E-13 or less(0.00025ppb / s)

[Emperor Giesemann] TAU = 1sec 2.78E-13 or less(0.00028ppb / s)
[Emperor Triple Crown] TAU = 1sec 3.8E-13 or less(0.00038ppb / s)





What is the summery of adjustable frequencies?

  • 100Mhz, 50Mhz, 48Mhz, 30Mhz, 25Mhz, 24Mhz, 8Mhz, 4Mhz, 33.8688Mhz,
  • 49.152Mhz, 24.576Mhz, 12.288Mhz, 90.3168Mhz, 45.1584Mhz,
  • Word Clock: 192kHz, 176.4kHz, 96kHz, 88.2kHz, 48kHz, 44.1kHz
  • Reference Clock: 10M Master Clock 


What is the standard frequency setting for Siltent Angel's  customers?

  • Output 1: 25Mhz
  • Output 2: 25Mhz
  • Output 3: 10M Master Clock 


The miniminst design of Giesemann OCXO iClock Mini Edition for Silent Angel will work plug and play. 



A demostration on AfterDark. Project ClayX Gisesemann OCXO 10M Reference Master Clock


Giesemann OCXO Features 

The product uses the selected audio grade OCXO, and through long-term calibration to select and install equipment with excellent stability.

  • OCXO that employs with qualitative measure equipment.
  • OCXO is enclosed and covered with Dynamat Extreme Corporation (Made in USA) which is used to stabilize and minimize heat separation,  addition EMI material from KEMET EMI Shielding is placed on top of OCXO,  the outer layer is covered with real leather to isolate the heat factors for maximizing OCXO performance . 
  • Alu material + Carbon Fiber material front and backplate, solid anti-vibration. In addition, due to the thickness used, 3mm / 6mm Carbon Fiber material material with plate can provide solid EMI/ magnetic coverage.
  • Advanced instrument Symmetricom 5125A calibrated with plotted characteristics. The phase noise, and Allen Derivation defines different grades of the OCXO. 
  • Audio Note Silver Solder
  • Duelund AC0.4 Silver Premium Audio Cable (Silver in Cotton / Oil impregnated) (Handmade in Denmark)
  • Ultra High Quality Large Factor 5151 SC Cut OCXO, very low phase noise and frequency stability compared to others small size OCXO specification 
  • SC Cut refers to stress compensated (SC) cut crystal resonators, which is more advance on performance of Frequency Vs Temperature changes, longer Crystal Aging. The pro is expensive to made and size is larger then normal OCXO. 
  • Then Large Factor size 5151 is around 5cm x 5cm dimension vs small factor 3cm x 2cm, 2 times bigger with better phase noise performances. 
  • OCXO are available in tailor made on various audio frequencies on special request. 


Level selection value
The OCXO installed in the product can calibrate the products used in industrial equipment for a long time, and use equipment with good characteristics. In order to optimally select the audio clock, we comprehensively evaluate with Symmetricom Flagship 5125A to analysis the phase noise characteristics and short-term stability (Allen dispersion) that can be determinate the OCXO grading accordingly.

The OCXO installed in this product uses a stable OCXO unit that has been calibrated for several months. In order to make the best choice of OCXO. We are conducting a comprehensive evaluation of phase noise characteristics and short-term stability (Allen dispersion) during detailed inspection. 


The final product will final measured and fine tuned with Keysight 53220A with reference to Atomic Clock , GPSDO. 




The iClock Mini of Giesemann OCXO Modules is enclosed by Carbon Fiber AudiophileMAT in 3mm









Type: OCXO Clock

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