SW1X Audio Design DAC II Absolute Top Tier Ref NOS DAC


 

It has been over 4 years since I have ventured back into the DAC arena, a cautious adventure being that I was never satisfied with the sound quality of the Lampizator Level 4, Berkeley Alpha and an Eastern Electric DAC. All of them had their strong suits in one area or another but they were not at the level of my modified Modwright Sony 5400ES or Marantz SA8005 Tube CD Player.

I had been following the DAC threads for some time and was optimistic and hopeful that technology had improved or at least the deign implementation, so I private messaged a few knowledgeable members to get an idea on what they have heard and seen at shows and in their systems. After several suggestions and myself doing some reading and research on the different technologies, I decided that the Border Patrol with SPDIF would be my first entry back into the digital age.

The moment this DAC was installed into my system, I began to understand from my listening experiences that R2R was the DAC chip that provided an unmistakable level of musicality and toe-tapping emersion into the music. Now, I knew the direction that was set before me to find my reference DAC with R2R DAC Chips, Non-Over-sampling or filtering. I began to notice a trend in different approaches in the implementation/design of technologies and have heard through-out the Audiophile Community that Audio Note was the “Standard” in producing “Analogue Sounding” Digital to Analogue Conversion. The BP DAC solidified this in my mind, whose roots are also from Great Britain.

After discovering the similarities of these DACs, I decided to contact an Audiophile friend in Great Britain to determine if there were any DACS in the spot-light that was knocking on the doors or even beating the legendary Audio Note sound quality? He steered me to a small company that is taking Europe by storm and after a week of reading their philosophy and design implementation, I decided to contact the Founder, Managing Director & Chief Audio Engineer on which DAC would suit my system and yield the best sonics without spending an absorbent amount of money…

After making contact with Dr. Slawa, Roschkow, I took his recommendation on the SW1X Audio Design Dac II STD ($3,200) and I am in agreement with his Philosophy on design, implementation and many aspects I have never heard of but his knowledge is quite impressive to say the least and has been very responsive to all of my questions. Here are some aspects of my DAC listed from:

http://sw1xad.co.uk/product/sw1x-dac-2/:


SW1X Audio Design™ DAC II Features:

-Specially selected and harmonically matched component & material quality based on performance level 2 standard:

- AN Kaisei, Philips BC, Siemens capacitors, Allen Bradley resistors, complementary silver and copper wiring technique everywhere

- NOS (Non-oversampling –zero digital domain filtering) design

- Based on 2 x PCM56 K – the most refined and highest resolving sounding 16 bit DAC chips ever produced (yes, even cleaner and more refined than most 24/32bit Delta Sigma chips) directly connected to CS8414 S/PDIF receiver

- Active I/V conversion via a special transistor (with less than 10 Ohm input impedance) with the shortest signal path directly connected to the tube grid

- Single ended, anode follower, zero feedback, 6N6P/ECC88 double triode valve output stage

- Output stage signal decoupling capacitor options a) Bosch PIO or b) Audio Note Copper Foil Mylar in Oil capacitor

- 6X5GT double diode valve rectified CLC (choke filtered) HV power supply

2 separate mains transformers for the DAC and the valve output stage circuits

Custom Germanium transistor based shunt voltage regulated power supplies around PCM56K circuit

Supports 24Bit/96kHz digital coaxial S/PDIF signal input

110/115/230/240V AC mains transformers

 

As a reference, I have been listening to my new CDs that I got as a gift for the past 4 months which includes The Touré’-Raichel Collective (The Tel Aviv Session), Audio Note Ambassador, Vincent Be’langer CD titled Pure Cello, Three Wishes For a Rose, Ma Xinhua (Cello), Feng, Dan (Piano) and The Spirit of Gambo, The Galaxy Recordings (Direct Cut Super Audio CD) which I am a big fan of string type instruments and in fact is what I primarily listen to and have a good grasp on any changes that could be discerned by implementing new equipment within my system.

My DAC II STD (13.5” W x 16” D x 5 ½” H) safely arrived from Great Britain, unit was packed very well and received in pristine condition. Digital inputs include AES/EBU and SPDIF and the Output RCA has 2 sets of RCAs which I imagine one set are Silver or Rhodium-Plated Copper and the other Copper, so you will have a choice in fine tuning the sound you prefer and not to mention the possibilities of tube rolling to ones’ desires… I also believe USB inputs are also available upon request.

I delayed my initial impressions after install since I was waiting to accomplish our daily nightly routines with the kids before settling down in front of my system, knowing that it is going to take hundreds of hours before the capacitors starts to form and settle in and another 50+ hours to hear the tubes at their best; 96 total hours on DAC II. I cued up the first track on The Tel Aviv Session, Acoustic Guitar followed by Pure Cello was blown AWAY! I was hearing things that were never hinted at on my previous playback and quite frankly, didn’t hear this wearing Audiophile head-phones. I was struck by the uncanny realism of musicians occupying a physical space within my listening environment, I am talking about spooky and very a satisfying experience. Details WAY in the background comes through in spades and imaging/sound-staging is Off-the-Charts! I am hearing the air between the bow and the Cello as it begins to swell and every note played from top to bottom is distinctly transparent, fingers between the fret of the Acoustic Guitar that captures re-verb, spatial cues, ambiance, tonality, speed, timbre, PRAT and the illusion of the very presence of these instruments occupying a three-dimensional space along with the musician.

This DAC has it all and Percussion Instruments as well as voices has the same attributes of sounding Life-Like, Natural, Organic or whatever term you use to describe, you have the feeling of being transported to the recording venue… 

You really begin to get a special appreciation for recorded music when you hear how a DAC like this SW1X Audio Design DAC II STD unravels the essence of the recording without altering the signal with up-sampling/over-sampling or applying filters. Implementing the DAC II STD into my system has been a revelation! I personally have never heard an Audio Note DAC and can only rely on those who have and the reviewer who has compared the DAC II side-by-side to the AN 2.1X and beat it, in fact, the DAC II held its own to the Uber expensive AN 4.1X and that says a lot about Dr. Slawa, Roschkow knowledge of circuit design, component matching and implementation, because the end result is all about the music…

www.hifi-advice.com/blog/review/digital-reviews/spdif-dac-reviews/sw1x-dac-ii-special/

 

Being that I was going to receive a Reference DAC, I wanted a cable that would not restrict but compliment the performance of the DAC II STD and decided to go with SW1X Audio Design Aero 10 which utilizes 100 % Silver in its SPDIF Cables; most claim 100 % Silver in their advertising but to discover it is silver-plated or the ground or return conductor is copper or plated and in my estimation is not 100%. My supposedly 100 % Silver SPDIF Oyaide DR 510 knocked off a more expensive and customized Silver Cable in the areas of sound-staging, imaging, detail retrieval and just a better sounding cable across the board and retails for $350+.

I was always under the impression that silver cables were bright, forward and analytical in their presentation but boy was I wrong. The Aero 10 is the best sounding Silver Cable I have ever heard and is in another stratosphere over the Oyaide. A very noticeable increase in spatial information, reverb, ambiance and detail retrieval is quite startling and at the same time sounds smooth, transparent, very organic and natural and this cable is not even close to being fully burned-in. From my cabling burn-in experience using a Audiodharma Cable cooker, it is at the 72-hour mark after removing the cable from the cooker when cable hits their sweet spot and I am needing another 48 hours to reach that point but will note more changes as the cable settles. Three days has passed since installing the Aero 10 and it is sounding beautiful, images are rock-solid and locked in place with a wide and deep sound-stage.

SW1X Audio Design has something special with their design and I believe that this is one of those DACS that will stay in your system for many years and the thought of chasing the latest chip will be quickly resolved upon powering up your SW1X DAC. This DAC and AERO 10 SPDIF Cable are “Highly Recommended”.

 

System Components:

 

Acoustic Zen Crescendo’s Loudspeakers

Don Sach’s DS2 6SN7 Tube Pre-Amplifier

Don Sach’s Kootenay 120 KT88 65 Watts Tube Amplifier

PS Audio Perfect Wave Transport

ModWright Marantz SA 8005 Tube CD Player (Current & Previous)

SW1X Audio Design DAC STD II

Equi-Core 1200 Balanced Power Plant

 

Cabling:

 

CH Acoustic X20 Power Cord

CH Acoustics X20 Anniversary Edition Interconnect

Teo Audio Ultra’s Liquid Metal Interconnect

Oyaide Black Mamba V2 Power Cords

Oyaide Tunami V2 Power Cord

Oyaide DR 510 Silver Digital SPDIF

Oyaide Tunami Nigor V2 Speaker Cables

Audio Design Aero 10 100 % Silver SPDIF

Gutwire Perfect Ground Cable

Audio Magic Blue Dot Premier Ground Disrupter

 


wig
@wig Great review. Good things aren't necessarily big or expensive. Even so, oh for the money to upgrade mine....
wig congrats on your new DAC! I read about that on HFA also, love that site, one of my comments is at the bottom of the review page.  It looks like a great DAC and he obviously, and I an not saying this negatively, ripped quite a few idea off AN. He even has levels 1-3 and Special and Signature versions like AN. The DACs look like AN DACs and even have some AN parts. It's a recipe that worked for AN obviously glad you like it so much I was very intrigued myself! Happy listening!
Superbly written review, wig. Congrats on owning what I am sure is a top-notch DAC. Enjoy!

Dave
Wig,
Congratulation, very well written review of the SW1X Audio Design DAC STD II DAC I
Asghar
Great write up. Was the price not mentioned or I missed it? 

Thanks Guys!

It is a great sounding DAC and will only get better with more time, which is amazingly good at this point...

Wig :)

One thing to realize with this DAC, unlike the Border Patrol, is that you will hear the jitter of the transport. If you change cables, transports or treat the disk, you will probably hear differences. This is why you are liking the silver coax cable.

This is a good reason to consider a good reclocker like the Synchro-Mesh to reduce the jitter coming from your transport. Transport jitter is usually quite high:

http://www.audiocircle.com/index.php?topic=154408.0

Other advantages of the Synchro-Mesh:

1) Provides galvanic isolation of ground between transport and DAC. Eliminates ground-loops.

2) Upsamples 16/44.1 to 24/96, allowing the filters in the DAC to be more effective and providing a more analog signal.

3) Creates a perfectly matched impedance to a good 75 ohm cable. Surprisingly, most transports don’t get this right.

Even very expensive transports, many times the cost of your DAC will have high jitter compared to the 20psec of the Synchro-Mesh. For a minimal $699 investment, you can get much better imaging, slam, improved soundstage and less edge on vocals. 30-day money-back guarantee, less shipping. Some customer feedbacks:

http://www.audiocircle.com/index.php?topic=154039.0

Also, I though you already had my reference silver cable for $499. My customers have yet to find anything that beats it, at any price. I only designed this cable because they were spending $2K+ and not getting great results. These cables should ALWAYS be more than 1m in length. Mine are 4 feet. See my white-paper explaining why:

https://positive-feedback.com/Issue14/spdif.htm

Steve N.

Empirical Audio

The jitter experts

Steve N,

This is an enthustiastic review for the SW1X DAC, please refrain from your insessant plugging of your own gear, it does nothing to add to the thread.
Steve N. has been booted-off another well-known audiophile forum for peddling his equipment. Don’t know how he gets away with it here,being Agon has a place to specifically advertise and sell audio equipment. He keeps referring to his sponsored forum as though it is impartial, to boot.
This forum doesn’t necessarily subscribe to the rules of other web sites. 
Wig,

Congrats on your new DAC! Which one of your power cords are you using with it?
@xrayz

- X20 PC on Balanced Power
- Oyaide Tunami GPX V2 on Tube Amp
- Oyaide Black Mamba V2 on Tube Pre, PS Audio PWT and DAC II; all fitted with Furutech FI-50 Connectors ( 2 OEM & 2 non OEM).
Hi Wig
Congratulations! No doubt this DAC is just fabulous sounding and I’m very happy for you. Based on your description of the sound, it doesn’t seem you need to reclock anything 😊.
Charles
Your balanced power will be dealing with jitter quite happily btw.. Congrats Wig..
ps68
Your balanced power will be dealing with jitter quite happily
Will you please explain how balanced power has an affect on jitter?

My SW1X DAC STD II has been running constantly for over two weeks now and is sounding more refined and front-to-back and sided-to-side layering is extraordinary. I can hear distinctly, 5 different performers on stage within their own space with no crowding, blurring or congestion.

I know further improvements can be had with better tubes and waiting on some 1960 Foton Factory Square Getters 6N6P to arrive and will roll the rectifier with a Tung-Sol 6X5GT. This should be a magical combination...

Wig 
cleeds,

Apologies, I only just saw your post re jitter and balanced power.

It is understood that by accurately balancing mains power any residual digital hash / reactive current will sum to zero ie common mode noise rejection. Equitech suggest a reduction in jitter of 30-50% in many cases just by using a good transformer which I can completely believe having been through this over the last few years. The sound from my own digital (Ayon CD-T & Concert Fidelity DAC040B/D) is far closer to my analogue front end via it's own dedicated 300va symetrical output transformer to the extent that I would say that digital really needs this to work optimally.

Some info from Equitech's Martin Glasband on the subject:
http://www.equitech.com/articles/bpng.html

KR,
Paul