giesemann reference sfp optical isolator pa1 on sale

AfterDark. Project ClayX GIESEMANN. OCXO Trifecta Extreme Edition for Esoteric (Audiophilestyle Edition)

Optimised Clock for
Grade vs Phase Noise@10Hz
Group Buy

AfterDark. is developing a new Master Clock for Esoteric user who want to try to maximise the performance for the Esoteric system with Master Clock Input. This product is driven by one customer special request to be connected to his Esoteric gear and network switch. He requested to have the best OCXO build in , triple outputs at 10M features for future upgrades on DAC. So, this is very first product build in Giesemann EVA, the flagship OCXO inside this new developed motherboard, to cope with his special requirements.  

The specification on Giesemann OCXO is quite comparable with Esoteric Master Clock when compared. So, it is not surprise, the improvement will be huge when we add the external Master Clock to bypass the internal clock on Esoteric. 

Clocking of digital audio signals is vitally important to improve on an already spectacular sound and takes it into an entirely new domain. With a Giesemann clock added to a Esoteric system, image snap into more linear and focus, the soundstage will widely opened up and music displays a substantially greater sense of authority in more accurate Bass, as well as offering noticeably superior resolution of details while making music more organic in presentation.   




Esoteric K-01XD SACD Player



Esoteric N-05XD Network DAC




What is the design concept of Giesemann OCXO Trifecta Extreme Edition?

  • The outputs signal will be in Square Wave, 75 Ohms with isolated with 6 outputs BNC Connectors.
  • Each of the outputs can be adjusted 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
  • Custom made LPS (Linear Power Supply) will be build in for demanding applications and optimised for OCXO Master Clock
  • Furutech NCF IEC socket to maxmise electrical contact on power supply
  • The color of chassis can be made to order with choices of Silver and Black Colors
  • Plug and Play compatibilty for dCS customers 


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, 25Mhz, 24Mhz, 8Mhz, 4Mhz, 33.8688Mhz,
  • 49.152Mhz, 24.576Mhz, 12.288Mhz, 90.3168Mhz, 45.1584Mhz,
  • DSD: 22.5792Mhz, 11.2896Mhz, 5.6448Mhz
  • Word Clock: 192kHz, 176.4kHz, 96kHz, 88.2kHz, 48kHz, 44.1kHz
  • Reference Clock: 10M Master Clock 


What is the standard frequency setting for Esoteric customers?

  • Output 1: 10M Master Clock 
  • Output 2: 10M Master Clock 
  • Output 3: 10M Master Clock 
  • Output 4-6: 10M Master Clock 


The miniminst design of Giesemann OCXO Trifecta Extreme Edition for Esoeric will work plug and play for all models.




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 Trifecta EXTREME edition of Giesemann OCXO Modules is enclosed by Carbon Fiber AudiophileMAT in 3mm 








Type: OCXO Clock

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AfterDark. is delighted to have successful shows at HighEnd Munich 2024.🙂

Please feel free to share the discount code with friends.We love to hear more music lover to enjoy this great product. 

Discount code: PA1