Femto clocks ,every unit should have one

I just spoke with Clint from Wyred 4 Sound and they loved the Femto and will be using it going forward for the updates. Mine is shipping back to me today. Looking forward to it.

Hello Pal, I have had the clock for over 300 hours now .i spent a fair amount of time with fuses,the a Synergistic 20mm 2.5Aslow blow
Is for sure better then the a Furutech fuse it comes with, Rhodium by nature is always a bit brighter,the Synergistic fuse or Hifituning Supreme
Is a better fit ,deeper soundstaging as well as micro details, for $50 well worth it , buy the fuse and send it to Clint they will instal it .between me and friends we have 4 brands .the audiohorizons is good but Too bright
I always give fuses 200 hours to fully settle in. Now about the Femto clock
Since Wyred spent so much time and effort in all the precision parts the Femto clock is an Automatic upgrade that you can hear ..I put a bug in their ears for several months. 82 Femto seconds,just look up Femto vs pico seconds. They found the best in it's respective size,and made in the U.S.A
This is why I got one of two dacs with the upgrade and this clock has the best specifications in it's class, even way down into the hz band very clean .it does take 250to Over 300 hours to fully refine I have logged every 24 hours with the same 8 test songs for a reference.The soundstage is noticably deeper as well as inner detail and dynamics bass seems a bit more defined the sonics are a bit more organic sounding. I mentioned that I bought a better pair of interconnects for this dac really pulls out what is on the disc.now I feel this dac now is complete .I will also mention though a Good power cord makes a nice added improvement .I have a revelation audio labs Silver power cord ,as well as a Wire world Silver electra7
I am trying to decide which is better for my setup they both are excellent.plugged into a brick wall line conditioner ,a great unit for little money,and they even make a 20 Amp model for amplifiers,- that is my Tip of the day !!

The term Femto clock is actually a registered trademark for IDT for a MEMS type oscillator, but i suspect this is not what we are talking about here. W4S are talking about Femto grade clock. I contemplate they are referring to jitter performance in the femtosecond range. Did anybody check out if this jitter is specified for the Audio range, or the industry standard 'Sonet range' of 12 kHz - 20 MHz? (In which case the low jitter spec is pretty much useless).

Yes actually it does deal in the audio range,there are a lot of variables,the clock is very capable of the 82 Femto second mark, the precision of the
Dac will determine how close it will hold to this standard . Even at it's
Worst it is still much more accurate then Any pico second clock.
Up to 75% if you do the math,maybe not at all frequencies, but a good
Part of the spectrum.I spoke with both Clock Mfg,and Wyred and
On both accounts the clock is most accurate in class Guaranteed,and
Wyred 4sound DSD-SE model has parts quality in several areas better then Any dac even at the $10k level. Such as the precision regulators, and resisters
Which are 10 x more accurate then the typical very good 1% variety.
In digital every small improvement is cumulative , and audible .i am not stating it is better then any $10k, I am stating that at it's price point and against anything up to $5k it is a very involving music maker.

Don't believe the hype. In the real world ALL so-called Femto clocks are just marketing BS when applied to audio.

This specifically applies to clocks intended for SONET applications (Read internet backbones), which need to have very low phase noise (jitter) above 12KHz, but care zero about phase noise below 12KHz. Which is why clock jitter for these clocks is specified usually as RMS 12KHz - 1MHz (or higher) and a very low level of phase noise / jitter at these frequencies is essential. This is why this specification recently became important and specified (many vendors simply adjusted their datasheets for what is the part that previously was a "picoclock")

Now here is the killer. it is practically impossible to make a crystal oscillator that is fixed frequency and does not measure at the max. a few 100 Femtoseconds RMS phase noise/jitter under the tests conditions. The cheapest clock you find in China will do that.

For Audio use what matters most is audioband (20Hz-20KHz) jitter. In this case a really basic "Tent-clock" rated at 3pS P-P Jitter RMS IIRC from a commonly available source with a cheapo 3-Pin chip regulator will beat the pants of ANY Femtoclock most designers are aware of.

None of them provide even 50pS peak-Peak jitter 10Hz-20KHz.

The GMT System, which uses a programmable clock that was not optimised for SONET, but for an application that needs low audio band phase noise levels., when measured it "Femto Clock" style, shows around 200 Femto Seconds RMS phase noise.

Most any clock in audio (1 rung above lo-fi) use if measured "Femto Clock Style" is a Femto Clock .

Finally, jitter is NOT the end-all be-all of good sound in digital.