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Gieseler Audio

GIESELER Groß DAC official release

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Hi Guys

 

Wow - nice piece of work.

 

Have recently got myself a dedicated notebook to run HQ Player.   I have found its up-sampling to be - well stunning - dead music simply comes alive with it.   My Direct Stream just goes 384 but Clays DAC to 768 - cant wait to hear how it sounds with that.   Will drop my PC fully loaded with music on its internal SSD and HQ Palayer to Clay in the next few days and see how it goes - should prove interesting.

 

I have gone through my DAC buying Days but if this thing takes out my DS - anyone want a DS?  Just kidding - mu DS has the inbuilt Bridge with MQA - but then again have this thing called an Auralic Aries - interesting listening ahead,

 

Thanks

Bill

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Clay

Based on the feedback - offer a custom front plate? e.g. just Gieseler, nothing, with the name Gross,Klein etc.

The model number can be a plate/sticker or something at the back or inside. I actually like the idea of a model and date number signed by the manufacturer somewhere inside or on the back. 

At the end of the day the sound is what matters, but if bespoke or tailor made or special can sell more, why not.

 

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Hi Guys,

yes I suppose I should have used the correct German spelling in the title but I don't know how to to that funny B on my keypad. Just worked it out.

 

Steve,

Width is 300mm x 200mm deep & 50mm high. The front panel is five mm bigger all round. The design did start out as basically the Konverter less the preamp part but I ended changing quite a few parts. In the Konverter the output transformers are driven by a active stage so there is plenty of level but the Groß DAC is using a totally passive design so the smaller transformers didn't work there. With a totally passive output stage the transformer matching is more critical & the large Jensen's ended up being a perfect match. The control menu is the same as the Konverter less the analogue inputs.

 

Matth & Krappo.

Yes guys I totally agree. The front panel in the photos was cut out about six weeks ago & at time the different font for the name  was just a impulse decision to try something diffent. The acrylic  panels take ages to do so I was being lazy with this first unit & just used the panels I had. OK I will machine a new front panel with Groß in the same font ASAP & edit the lead photo.

 

Some more info which may be of interest. 

During the R&D on the Groß DAC I spent ages looking at Galvanic isolation for the I2S lines, reclocking with a nice master clock ect.

Unfortunately there are quite a few technical issues that prevented me from doing this. All AKM DAC's operate in "slave mode" so I can't just plonk a gun clock next to the AK4497EQ & run it from that. There are ways around this though  like using a sample rate converter ahead of the dac but the sonic results aren't always they best & I feel it adds unnecessary complexity. At one stage I did have success by runing the Amanero in slave mode & then added the isolation/reclocking. Unfortunately when the Amanero is in slave mode I lose the DSD & mute flag lines which I need to operate the DAC correctly.

HOWEVER there is a solution for for those who insist on isolation & better clocks.

Singxer make a nice plug in USB board called the F1 

https://www.shenzhenaudio.com/singxer-f-1-xmos-usb-digital-interface-board-xu208-chip-high-end-u8-upgraded-version.html

Apparently it has the same pinout as the Amanero so in theory it should be a drop replacement option. I will order one & do some testing shortly. If this works out ok I can offer a choice of either Amanero or Singxer USB input when ordering. The Singxer option will cost about $165 more. 

At the moment the Groß DAC (to me anyway) sounds incredibly good & it's hard to imagine it getting much better but when I have a Singxer version I will do a side by side comparison & let you know the results.

 

Edited by Gieseler Audio

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33 minutes ago, Jventer said:

Clay

Based on the feedback - offer a custom front plate? e.g. just Gieseler, nothing, with the name Gross,Klein etc.

The model number can be a plate/sticker or something at the back or inside. I actually like the idea of a model and date number signed by the manufacturer somewhere inside or on the back. 

At the end of the day the sound is what matters, but if bespoke or tailor made or special can sell more, why not.

 

 

Very good idea. Two thumbs up!

GIESELER only at front left, nothing else at the front, plate or sticker at the back.

Perfect for ALL DACs, not for custom version only!!!

 

Matt

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27 minutes ago, Gieseler Audio said:

Hi Guys,

yes I suppose I should have used the correct German spelling in the title but I don't know how to to that funny B on my keypad.

 

Steve,

Width is 300mm x 200mm deep & 50mm high. The front panel is five mm bigger all round. The design did start out as basically the Konverter less the preamp part but I ended changing quite a few parts. In the Konverter the output transformers are driven by a active stage so there is plenty of level but the GroB DAC is using a totally passive design so the smaller transformers didn't work there. With a totally passive output stage the transformer matching is more critical & the large Jensen's ended up being a perfect match. The control menu is the same as the Konverter less the analogue inputs.

 

Matth & Krappo.

Yes guys I totally agree. The front panel in the photos was cut out about six weeks ago & at time the different font for the name  was just a impulse decision to try something diffent. The acrylic  panels take ages to do so I was being lazy with this first unit & just used the panels I had. OK I will machine a new front panel with GroB in the same font ASAP & edit the lead photo.

 

Some more info which may be of interest. 

During the R&D on the GroB DAC I spent ages looking at Galvanic isolation for the I2S lines, reclocking with a nice master clock ect.

Unfortunately there are quite a few technical issues that prevented me from doing this. All AKM DAC's operate in "slave mode" so I can't just plonk a gun clock next to the AK4497EQ & run it from that. There are ways around this though  like using a sample rate converter ahead of the dac but the sonic results aren't always they best & I feel it adds unnecessary complexity. At one stage I did have success by runing the Amanero in slave mode & then added the isolation/reclocking. Unfortunately when the Amanero is in slave mode I lose the DSD & mute flag lines which I need to operate the DAC correctly.

HOWEVER there is a solution for for those who insist on isolation & better clocks.

Singxer make a nice plug in USB board called the F1 

https://www.shenzhenaudio.com/singxer-f-1-xmos-usb-digital-interface-board-xu208-chip-high-end-u8-upgraded-version.html

Apparently it has the same pinout as the Amanero so in theory it should be a drop replacement option. I will order one & do some testing shortly. If this works out ok I can offer a choice of either Amanero or Singxer USB input when ordering. The Singxer option will cost about $165 more. 

At the moment the GroB DAC (to me anyway) sounds incredibly good & it's hard to imagine it getting much better but when I have a Singxer version I will do a side by side comparison & let you know the results.

 

 

Hi Clay,

please do NOT offer a SRC, the experiences with the AK4137 in the Holo Spring DAC are not good.

Very good idea to compare different USB interfaces.

And please do not forget the USB only version to keep the price as low as possible.

Thanks

Matt

 

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3 hours ago, matth said:

 

Hi Clay,

please do NOT offer a SRC, the experiences with the AK4137 in the Holo Spring DAC are not good.

Very good idea to compare different USB interfaces.

And please do not forget the USB only version to keep the price as low as possible.

Thanks

Matt

 

 

Whats an "SRC"?

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Hi Matt - definitely no SRC (Sample rate converter) & yes a USB only version will be available.

 

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Clay, is DSD512 over USB available? Windows and Linux (eg for microRendu or Antipodes servers)?


Sent from my iPhone using Tapatalk

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Clay, is DSD512 over USB available? Windows and Linux (eg for microRendu or Antipodes servers)?


Sent from my iPhone using Tapatalk

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I have  just been listening to DSD 256 over USB using a windows based server & that plays fine.

I don't actually have any DSD 512 material so I can't test at that rate

I will have to get back to regarding Linux based servers.

 

Update - just tried some DSD using my little Celeron NUC running Daphile.

The native DSD setting was greyed out in Daphile  so I enabled DOP. 

DSD 128 played fine  but DSD 256 was garbled so too much processing for the little NUC  I think.

 

Sorry for the edit but I just realised my highest rez DSD material is DSD256 Not DSD512.

 

Edited by Gieseler Audio
update

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