Feeding the 10Mhz clock as Hapi wordclock input

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robertopisa
Posts: 27
Joined: Tue Feb 24, 2015 20:38

Feeding the 10Mhz clock as Hapi wordclock input

Postby robertopisa » Wed Apr 28, 2021 17:30

Did anyone tried to connect a 10Mhz clock directly on the Hapi wordclock input?

I know that Hapi accepts from 44.1Khz to 394Khz as input on the BNC.
What if reference 10Mhz clock is given? Anyone did it give a try?

Thank you
-R

vinodkumar
Posts: 13
Joined: Fri Jul 19, 2013 22:13

Re: Feeding the 10Mhz clock as Hapi wordclock input

Postby vinodkumar » Tue May 18, 2021 06:30

Hi robertopisa,

I am using an Mutec MC3+USB and Ref-10 SE clock with Hapi MK1. There is a noticeable difference between the internal and external clocks. At the moment, I'm using 44.1khz clock source.

-Vinod

robertopisa
Posts: 27
Joined: Tue Feb 24, 2015 20:38

Re: Feeding the 10Mhz clock as Hapi wordclock input

Postby robertopisa » Thu Sep 16, 2021 10:20

Hello Vinod,

this forum is not very active, so I forgot to check the messages after a while and I did not see your reply.
I first apologize and then thank you for replying :)

I was not very clear with my question: what if I directly feed the Hapi with 10Mhz as external World Clock?
Does it accept it anyway?

Kids regards
-Roberto

Perfect Record
Posts: 646
Joined: Thu Apr 24, 2008 06:09
Location: St Paul, Minnesota USA
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Re: Feeding the 10Mhz clock as Hapi wordclock input

Postby Perfect Record » Mon Sep 27, 2021 23:13

10mHz in won't work, and is pointless. Also, 10mHz is not an integer multiple of any common audio sampling frequency.

If you have a clock with an internal 10mHz master clock, and conventional outputs at audio sampling rates, you might hear a difference, but it may not be an improvement. You are adding 3 PLL's to the process when you use rubidium clocks. You might be better off with a crystal clock. Maybe Black Lion Audio, provided that their clock is a real crystal and not a frequency synthesizer.

robertopisa
Posts: 27
Joined: Tue Feb 24, 2015 20:38

Re: Feeding the 10Mhz clock as Hapi wordclock input

Postby robertopisa » Tue May 10, 2022 04:47

At the end, I employed a Grimm CC2 master clock, which can work with Merging Hapi for all sample rates as follows. I use just the two base FS = 44.1k and 48k from Grimm (Setup->I/O->Sync->WCK), and multiplies them by 1x, 2x, 4x, 8x internally in Hapi as follows: just go to Setup->Formats->Auto and disable auto sampling mode. At this point, change manually Setup->Formats->SampleRate as your prefer. FS = 44.1k in Grimm is useful for 44.1, 88.2, 176.4, 352.8, and DXD/DSD in Hapi, while FS = 48k for the remaining ones.

Cheers
-R