Seeking Advice on NOS DAC


Looking to purchase an NOS DAC, budget is $1500.
Currently available for sale are:

- Metrum Acoustics Hex digital converter  (used)
- Metrum Acoustics Amethyst DAC       (new)
- Acoustic Plan Digimaster Tube DAC     (used)
This is a German-built NOS, 24-bit R-2R resistor ladder network, PCM1704U-K converter with 4 tube EC 86 triode outputs.
- HOLO Audio Spring DAC – LEVEL 2    (new, but over my budget of $1500)

My primary listening is via the PS Audio PWT, while music files on my Mac are steadily increasing. I’m thinking NOS due to my large collection of Redbook CD's.

So, any experience or comments on which way to proceed is appreciated.

128x128lowrider57

Showing 3 responses by audioengr

Lowrider - not a silly question at all. Jitter will be a problem unless you have a really low jitter source, like an expensive USB converter or network renderer, costing more than the DAC.

If you plan to use sources such as a transport or a Sonos etc., a reclocker like the Synchro-Mesh will bring that sound quality up to the latest technology uber-expensive DAC’s at a low cost.

You get the best of both worlds: analog sound of NOS, plus detail, dynamics and liveness of a low-jitter source.

I used to be of the opinion that resampling does some SQ damage to the datastream that cannot be recovered, but my latest Synchro-Mesh sounds almost identical to my best Ethernet renderer, which is 5X the cost of the Synchro-Mesh. My BNC cable is recommended with it because of the fast risetimes on S/PDIF.

Steve N.

Empirical Audio

@lowrider57 , Upsampling will not hurt, it will usually help, and most NOS chips support 24/96.  Simpler to filter this too.  Depends on the vintage of the D/A chip though.  If its a TDA1543 chip, maybe 44.1 would be better. 

You can also get the Synchro-Mesh in 44.1 flavor at minimal cost and select 16-bit.  Also great sounding.  I would recommend 24/96 standard version if the D/A supports it.  30-day money-back.

Steve N.

Empirical Audio

@lowrider57 , the best USB converter is the Berkeley. Find one used.

I have abandoned USB after doing 6 generations of interfaces. I even designed a XMOS galvanically isolated one like the Berkeley. Ethernet is superior for sound quality and setup. I have a DLNA Ethernet interface that works with Jriver and Audirvana and I’m working on a Roon-ready interface now.  They can use WIFI or wired.

Steve N.

Empirical Audio