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Gieseler Audio

GIESELER Groß DAC official release

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Hi Guys,

well I’m steadily building these but it is still a slow process with me doing all the work.

I lost a little time tweaking the firmware a bit but it was well worthwhile. The  menu structure has been improved a bit & also the clicks/pops with mixed DSD/PCM playback now removed. I will thoroughly test it over the weekend & if bug free will send out upgraded chips to current owners. The firmware upgrade is dead simple - just a matter of replacing the plug in chip with the new one. I’m also trying to source better custom packaging. The demo unit for Victoria is still on but I have to complete current orders first - now twelve - four finished & eight to go. As they say - no rest for the wicked!

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3 hours ago, Gieseler Audio said:

I lost a little time tweaking the firmware a bit but it was well worthwhile. The  menu structure has been improved a bit & also the clicks/pops with mixed DSD/PCM playback now removed. I will thoroughly test it over the weekend & if bug free will send out upgraded chips to current owners. The firmware upgrade is dead simple - just a matter of replacing the plug in chip with the new one.

:sorry: , my doing. Could have put up with occasional click/pop switching between pcm & dsd, but skipping to next dsd track was not good & distracted the superb dsd playback. Yes, dsd is a step up. Bad news is have to open up wallet to get more! :lol:

3 hours ago, Gieseler Audio said:

I’m also trying to source better custom packaging. 

Hope you are not taking my unboxing comment in my review to heart! :ohmy::lol:

Those waiting will never forgive me if this further delays their units.

3 hours ago, Gieseler Audio said:

 

 

..but I have to complete current orders first - now twelve - four finished & eight to go. As they say - no rest for the wicked!

Looks like a busy weekend for you and Bill (with his whip!)  :na:

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A box is a box ........... don't fret it ........ I don't think it is a heavy enough component that bubble wrap would not be sufficient packing ..... :):) ...... even Earle, whilst using a wooden crate to handle the weight, mainly uses yards of bubble wrap to pack even his largest amps.

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18 hours ago, Gieseler Audio said:

The demo unit for Victoria is still on but I have to complete current orders first - now twelve - four finished & eight to go. As they say - no rest for the wicked!

can i book the demo unit in melbourne as well? thanks

Edited by hotJ

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4 minutes ago, hotJ said:

can i book the demo unit in melbourne as well? thanks

I'm hoping I can have it after you,  if that's possible?  

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Love the look of the Groß DAC Clay.  It would be great to try it out at some point.

 

Out of interest, what influenced the decision to use output transformers?

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I am still planning on sending one to Melbourne for demo purposes but I need to fill the current orders first.

It would certainly be good to see how it compares to the Mola Mola Makua.

 

Ouput transformers;

Actually there were several reasons but the first was sound quality. Ages ago and just on a gut feeling I ordered a pair of entry level Jensen’s line out transformers from Parts Express. I jerry rigged these up to a Klein II DAC & the result was a serious step up in sound quality. This was a big surprise as the Klein II has an excellent class A output stage & I really wasn’t expecting an improvement but there certainly was. Then after some research I discovered that the PS Audio Direct Stream & Linn Klimax both used line output transformers for the audio out. Now these are seriously good sounding units so that certainly helped confirm that line output transformers was a good way to go. Also the Direct Stream was actually using Jensen transformers.

I also wanted to a try a direct out approach from the DAC chip and a transformer is an ideal way to do this.

There were some hurdles on the way though as the transformer needs to be well matched to the DAC output & you also need a reasonable drive level. Fortunately the AK4497EQ chip has some special heavy load mode options that can be implemented from the registry. Anyway to cut a long story short I had some helpful suggestions from a AKM engineer & by experimenting with a range of Jensen transformers finally got a great result. I did need to move up to the top PC mount transformer to get two volts RMS out though & this bumped the cost up a bit.

The other bonus is by using a transformer output stage I can offer balanced or standard RCA out as well as full galvanic isolation if required.

Phew! A need another coffee after that explanation!

 

Edited by Gieseler Audio

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Very interesting Clay. The PS Audio Directstream is certainly a good example of a great sounding DAC using output transformers.  I can’t wait to hear how your implementation sounds.

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It certainly looks like a interesting device.

I will do some investigation.

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