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Which DACs bypass digital filtering?


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I know iBasso portable music player added a selectable NOS filter through a firmware update. This almost seem like it would be a emulated filter instead of bypassing everything.

 

I remember reading Rob Watts of Chord Electronics talking about a lot of DAC's that use NOS are using a digital filter instead.

Something about the DAC needing good quality resistors to be able to do true NOS.

 

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About the list; is there a reason for not include Totaldac? AFAIK all the models are r-2r ladder (with Vishay resistors) and natively NOS by nature but one can activate a software FIR in case of...Well... Fun? 

 

At least that's how it is with my d1 mk2. 

Jussi Arvio

Contributing Editor

Hifimaailma Magazine

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On 4/29/2021 at 6:43 AM, jparvio said:

About the list; is there a reason for not include Totaldac? AFAIK all the models are r-2r ladder (with Vishay resistors) and natively NOS by nature but one can activate a software FIR in case of...Well... Fun? 

 

At least that's how it is with my d1 mk2. 

 

I had TotalDAC and a few others before (in lighter gray - here) but ended up removing them some because they wouldn't take high rates and bit depth and/or others because their technical performance is not particularly outstanding.

 

Edit:

This is not a generic list of NOS DACs. As mentioned in the original post, this is a list of high-performance* commercial DACs that allow user to bypass digital filtering (NOS), leaving that task to a software music player such as HQ Player.

 

* - no TDA1543-based DACs, and only equipment which will take 24bit and sampling rates above 176.4/192kHz and perhaps DSD.

"Science draws the wave, poetry fills it with water" Teixeira de Pascoaes

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Denafrips DACs are disqualified, they're not NOS.

 

 

Updated list:

 

- Aqua DACs

- Armature (some models): Asterion (similar to Holo Spring) and Cronos (similar to Denafrips Ares)

- Audiobyte Vox

- Bricasti M21 and M3 (DSD-only)

- Esoteric (some models?)

- Holo Audio (some models)

- iFi micro (some models)

- Musician Audio

- Metrum Acoustics

- Phasure NOS1 DAC

- Singxer SDA-x family

- RME ADI-2 DAC, ADI-2 Pro ADC/DAC

- Rockna DACs

- T+A (some models): DAC 8 DSD, SD 3100 HV, SDV 3100 HV, HA 200

- Teac UD-50x family

- Topping (some AKM models): E30, T70, T90

"Science draws the wave, poetry fills it with water" Teixeira de Pascoaes

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