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Old 30th October 2012, 11:32 AM   #521
Bunpei is offline Bunpei  Japan
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Dear Acko,

Quote:
Originally Posted by acko View Post
... The SQ of the setup is really good, so it goes to indicate that the NDK XOs and signal processing of the Turbo Clock are working well. I haven't done direct comparisons yet but based on memory, appears sounding better the Crystek types used previously with this DAC. So standard Async mode with low jitter XOs does sound very good. ...
I'm very glad to hear the result on NDK XOs of 90. 3168 and 98.304 MHz.

Quote:
Originally Posted by acko View Post
... Based on the above results, I am still undecided as to whether to go further and mod the EXA unit for synchronous operation. For this case, 2 slave clock outputs from the Turbo Clock goes into the Clock inputs of the EXA unit. The two on-board XOs need to come out. Then I have got to tap the embedded Fs signals of the EXA to switch the Turbo Clock accordingly. Fairly, intrusive process and may cause damage or void any warranty of this fairly expensive EXA unit, so treading carefully ...
When you are ready to integrate SDTrans to your TURBO Master Clock board in a synchronous master clocking scheme, I will support you as much as possible. As SDTRans is designed to accept external master clocks from the first time, you will find it easy to change its hardware configurations. Even if you break any part of the transport board, I am sure Chiaki will repair it without any problem.

Quote:
Originally Posted by acko View Post
... Also, the Master Clock from the Turbo unit is inverted w.r.t. the Slave Clocks to reduce noise further as indicated in one of the ESS App note, so all lined up! ...
I am very interested in this feature and result.

By the way, I tried a galvanic isolation of USB 2.0 high speed interface successfully without any complicated ways. If you are interested in the method, please read this post.
USB DSD DAC and ADC by ElectrArt

Best regards,
Bunpei
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Old 30th October 2012, 11:32 AM   #522
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The pads marked mclk are for u.fl or w.fl micro coaxial sockets. If you look at the AKD12P photo on acko's website you will see that these pads are available underneath the mounting point for the asynchronous clock on that board, this allows that board to be used with either, depending on user choice.

In multichannel situation that you propose, I would suggest the AKD18 is a better choice. Asynchronous clock onboard and multiple channels in the one DAC so no clocking issues that qusp has mentioned.
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Old 30th October 2012, 11:35 AM   #523
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Maybe I should just drop this and go for an akd18 and run that as four channel instead

Missed the last post, same idea it seems :-)

Last edited by dahlberg; 30th October 2012 at 11:38 AM.
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Old 30th October 2012, 03:08 PM   #524
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Is there a group buy for the acko ?
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Old 30th October 2012, 03:16 PM   #525
qusp is offline qusp  Australia
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no, maybe acko would offer something but no there never has been and nor would I expect much discount, despite the higher than some pricing the parts and production cost on these is large, teflon multilayer PCBs with gold plate, only top shelf parts. besides what are you talking about? acko what? there is 4 or 5 dacs and multiple different formats

Last edited by qusp; 30th October 2012 at 03:19 PM.
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Old 30th October 2012, 05:37 PM   #526
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ok, I'm looking at the 9023 DAC. Looks great.

I'd like to use the amanero I just ordered and hook it up using I2S. What bit rate / frequency does this dac support?
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Old 30th October 2012, 11:06 PM   #527
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Quote:
Originally Posted by merlin2069er View Post
ok, I'm looking at the 9023 DAC. Looks great.

I'd like to use the amanero I just ordered and hook it up using I2S. What bit rate / frequency does this dac support?
So the AKD23 then.

Acko's board is, IMO, the best design currently available to match (possibly exceed?) the specification for the DAC chip that are on the datasheet for the ES9023, for the reasons qusp has mentioned above. Connect the power, i2s signal pairs to the positions provided and the output to your chosen amp and enjoy!

The bit rate/freq are per the ES9023 datasheet. 24bit/192k max.

Last edited by hochopeper; 30th October 2012 at 11:11 PM.
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Old 31st October 2012, 01:51 AM   #528
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Thanks. What dac handles 32/384k - which I think is a bit overkill.

Oh, the filter buffer looks like a great output option.
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Old 1st November 2012, 12:12 AM   #529
acko is offline acko  Australia
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Quote:
Originally Posted by qusp View Post
just wait for your fifo for sync mode mate. only thing you lose is multichannel and DSD and you can then have it on everything
Much as I thought. Easy to interface with Turbo Clock, decouples the transport/source completely. IMO the best way forward!
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Old 1st November 2012, 03:53 AM   #530
qusp is offline qusp  Australia
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Quote:
Originally Posted by merlin2069er View Post
Thanks. What dac handles 32/384k - which I think is a bit overkill.

Oh, the filter buffer looks like a great output option.
of ackos stuff only the 9012/18 options handle 44.1->384kHz
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