The Clock Tests (part 3)

The Clock Tests (part 3)

The test goes on…

This time mostly thanks to Stefan Wapstra, who was so kind to send me three 45Mhz Clocks. The First version of Andrea’s DRIXO Driscoll clock PCB, a Crystek CCHD-957-25 and the standard Clock delivered with the FiFoPi Q3. Next to those I had the Accusilicon Clocks 318 and 338 warmed up for comparison with the previous mentioned ones from Stefan. I used the same setup as last time. I had some comments that this was rubbish and I could not draw conclusions because of the flying wires etc. Well, I can assure you, the differences are quit noticeable and the ease of A-B comparison is just to good. Let’s put it this way, when the final setup is defined, no one will connect clocks like this, so assume there is even a bit more to gain. Anyway, this was for relative comparison and not fining the absolute “truth” 😉

Oh, the clocks were all under Power for 5 days or so and never went “off line” during the test

Clock Test 3-1
Clock Test 3-1

Apples and pears?

To be absolutely fair, I am comparing a bit apples and pears, as all clocks are 45Mhz except for Andrea v2 which is 5,6Mhz and hence an even lower phase noise as would be possible with a 45Mhz (which is not available, the max are the 22 and 24 MHz, but only as side comment)


In the meantime this is kind of becoming the BIG test. I got very kind offers from people to send in and lend me their clocks… VERY much appreciated. This enables a broader spectrum of clock reviews and comparison and hopefully lead to some guidance of what kind of clock to take for your personal situation. For the record: I used similar / same tracks as last time. All “Audiophile Recordings” with native 44.1 kHz sample frequency

Standard Ian Canada FiFoPi Q3 Clock

As I wrote earlier, in the Q2 version there are some simple clocks so you can check functionality and get a good idea of the working of the FiFoPi. Even with a simple clock the benefit of the FiFo is clearly audible – but compared to the other clocks the performance is very basic. Now the Q3 clock (sorry I have no clue what this clock is) is clearly a good up tick from the previous version. Sounds gets somewhat more involving. Still not as good as the tent Clock and that was the entry of the clocks which made a difference. So nice it is better, but getting new clocks is still highly recommended !

Cystek 957

Interesting experience. My first reaction, was like wow, like someone stomping you in the side to pay more attention. This clock immediately engages you with a great soundstage and lively voices and instruments. Jumping ahead, I believe the clock plays easily in the same league with the Accusilicons and depending on your complete system (DAC, Amplifier, Speakers etc) you might without any doubt prefer this one over the 318/338. Having said so…. it might be the other way round: Like “no, this jumps too much in my face”, I would prefer a notch less intrusive sound. Up to you!

Crystek CCHD-957-25 Clock
Crystek CCHD-957-25 Clock

Accusilicon 318 / 338

First time I had both clocks in the A-B bench test setup. Still not 100% sure, but “people say” the 338 is “just” a selection of the 318. Well that actually might be the case. They sound very similar in terms of sound stage, natural sound etc. A tad more laid back compared to the Crytek. Is smooth the right wording? But definitively not old fashioned brown English sound or alike LOL 🙂 Great clocks, for a reasonable price and clearly an improvement over standard and also the Tent XO. The 338 is doing everything the 318 does, just a little bit more convincing. If it is worth the more than double price? If you have spend already 4 figures on your DAC, I would say yes. If you keep it simple with a PI, FiFoPi and a standard HAT-DAC, probably not…. my 2 cents !

Andrea Driscoll Clock V1

Upfront, I like to remind you on the earlier apple and pear comments… Never the less, This Andrea Version is much more easy to implement (see pictures, that is all you have / need). Sound wise it takes an interesting step ahead of the 975/318/338 group. This clock is more natural, gives more texture and engages more. Very enjoyable listening… If you could still get these somewhere, it might be a good choice if for whatever reason the V2 version is not on your shopping list

Clock Test 3-3
Clock Test 3-3

Andrea Driscoll version 2021

I already described this clock in the earlier tests, but just to put things in perspective with the rest. I had the feeling, as this clock is a bit longer under power now, it even got a little bit more mature. Switching to this clock gives a sudden experience of full engagement, very natural soundstage and a wonderful detail in voices and instruments. like getting more pixles. Not HDR, that is more the Crystek if you will.

Actually I hate wordings like this, but with the 5,6Mhz clock it feels every time if some magic happens. It is clearly recognizable and if all the cons, like the whole construction around the DAC or a totally different price category, are no objection, this is your clock.

Conclusion and next steps

Hard to draw a conclusion to be honest. I’ll take a stab at it. You want best possible? The Andrea 5,6 Clock is really good, but with a possible con of size and not easy drop in, as well the fact it only plays 44.1 family tracks. With clock doublers you can double the amount of boxes, but also increase the range of playable tracks of course ! The doublers increase the phase noise with minimum 6dB per doubling. Meaning this will give better expected results than using a higher frequency crystal….

I will get some more Andrea Clocks from Eduard and will continue comparison within the Driscoll family but with other frequencies

On the very good clocks (Accusilicon and Crystek) it might be a choice depending on the rest of the audio chain as the tonality of Crystek and Accusilicon differ a little bit. I would say Crystek a bit more analytic and direct (HDR?) and the 318/338 a bit more laid back. BUT the differences are relatively small! For me they all play in the same league…

As next step there will be two more things to be done in one session. Mamal from Berlin send me a 11MHz DIL14 version his friend Jürgen made for him. It is based on the first version Driscoll Clock from Andrea

The second thing being comparing power supplies on the 5,6MHz Andrea clock to see what that will bring (or not)

Later this summer, I will get the whole Andrea SET from Ed to test 🙂

Stay tuned !

11 thoughts on “The Clock Tests (part 3)

  1. Hi Jan, yes (!) I have that board already here and this will be tested after comparing power supplies for the Andrea 5,6MHz Clock. So having best clock with best sounding PSU option and than I will add the ReClockPi 🙂

  2. Hi Doede,

    Your comparison is similar to my subjective experience. I did not compare side to side like you but had to compare from memory.
    In my set and to my ears I can’t stand the sound of the Crystek clock anymore since I build Andrea’s V1 clock. In my set, with the very direct and dynamic sounding field coil speakers, the Crystek makes the sound much too hard, especially in the high regions.
    I advise you to run the test again with the reclockpi, this will make the differences even more apparent.

    Looking forward to your PS tests. Will you be testing batteries, ultracaps, linear and switching power supplies?



    1. Good to hear your side of things Stefan. The plan is to take whatever power supply I have at hand here, which is from crap to ultra low noise and batteries and ultracap…. My plan is to just get a good feel of the differences and how significant they are

  3. Hello Stefan,
    When i send Doede my 6 Italian circuits i will include the 61,7 F 18 volt supercap from Eaton.
    I will use that one with an LCRC supply followed by a 16,5 volt ldovr circuit. Will be precharged by a big charger combined with Arduino controlled circuit.

  4. It is not all clear to me if you use this with, or instead an external dac (I have 4 deck dddac).

    1. Hi Gaston, I did all the tests with my external DAC, which is a one deck standard DDDAC setup with transformer output. The final Clock (Andrea Clock) I use with my own 4 deck DAC

  5. Hi Foede,
    That is good to hear.
    Would it be possible to make a list what is needed on top of the dddac and RPi. The reviews are interesteng butover my head, but I do want to put together the best sounding RPi I am capable off?
    Thanks a lot!

    1. The best sounding solution is to feed the DDDAC with a RPI streamer with a FiFoPi and ReclockPi. the I2S output from this combi goes to the DDDAC input.

      on top you can select high end XO clocks for the FiFoPi

      make sure to power all these boards with clean low noise power supplies

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