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Author Topic: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)  (Read 13952 times)

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Marvey

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #20 on: September 11, 2013, 08:49:19 PM »


I'm guessing all of these DACs are sounding better with the OR5 than through their usual inputs, making comparisons more difficult.

As done as I think I am, I might have to borrow one of these magic boxes once I get my GS-X.

Yeah, I should send mine out as a loaner. Or maybe we can ask Steve for one.


This is what you get by stacking so many PCM1704 on top of each other and a good implementation. :money:


Yeah, eight total / four per channel. Kind of overkill for such an expensive chip. Looked up the spec sheet and the distortion / dynamic range for the PCM1704s is almost a magnitude greater than the current sigdelta chips. The noise floor is also about 10db+ higher. I guess stacking the chips helps to improve these aspects.

Analog Devices? Cirrus? Asahi Kasei? Just don't say - Wolfson. I'll never understand how PWD2 sounds how it sounds with these chips. Everything Wolfson has always sounded pretty meh to me.

I liked all of the AK implementations I've heard. I agree on the Wolfson's being meh, at least with the stuff I've heard. As for the secrets of the PWD2, the board uses regular ol' chip regulators, LM317 or that sort. Decent quality caps. Two chips stacked. The major difference I suspect is those goofy bright red PRP audiophile resistors. I'm wondering if the treble and also the microdetail apsects of the PWD2 have something to do with those. I've heard from one other person who has experience with these PRP resistors say that the sound on the bright side. I've been tempted to replace them with Takman carbon film types just to see what happens.

PWD2 doesn't use the builtin filter of the DAC, that's the main difference. Likely the same with HiLo and Cirrus chip.(Why else have a huge fast FPGA inside? Certainly not for the touchscreen... reclocking and SRC do not require that fast FPGA either.)


Actually, I think the PWD2 does make use of the built-in Wolfson chip filters. The PWD2's five switchable filter types seem to correspond with the five digital filters described in the WM8741 spec sheet. The PWD2 does offer a reclocker via ASRC, but that's like pressing the "MAKE MY MUSIC BORING" button.

The FPGA may be for the "digital lens" or extended FIFO data buffer between the digital receiver and the DAC chip. NativeX mode turns this on. With OR5  i2s, turning this off to "Native" works better.
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DaveBSC

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #21 on: September 11, 2013, 09:57:44 PM »

So you're saying - hide yo kids, hide yo wife, thro awee yo deltasig?

And that I need to rethink about making my "last" DAC on PCM1794 and rather switch to PCM63...

You can do much better than the 1794 while still staying with delta sigma IMO.

Analog Devices? Cirrus? Asahi Kasei? Just don't say - Wolfson. I'll never understand how PWD2 sounds how it sounds with these chips. Everything Wolfson has always sounded pretty meh to me.

AD1955 is my favorite overall, followed by AKM4399. Then WM8741/2, Sabre, and Cirrus and BB at the bottom of the list. The old TOTL Accuphase DAC used I think eight stacked 1955s, and it was *sweet*. The new Sabre based one is not.

The first Vega prototype was based on the AKM like the ARK MX, but they ultimately went with the Sabre for the DSD and DXD capabilities and upsampling they wanted. Auralic admits they had to get a lot of outside help because the 9018 spec sheet is full of holes and misinformation. I suspect that's why so many Sabre based DACs aren't very good.
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twizzleraddict

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #22 on: September 12, 2013, 06:05:37 AM »

I mean shit, it took my wife 2 seconds to identify which one she preferred, and she didn't even know which was which.

Ah ha, the truth comes out and the wife influence factor has swung the decision in favor of the M7 completely!  :)p4

All kidding aside, if the OR is required to squeeze the best performance out of both these units, for those that don't have the luxury of this component (and the needed cabling), what would be the recommendation between these 2 units standalone? I think that also bears comparing (possibly a low priority for you right now) and worth some thoughts on. It'd be great to add the Ag M7 (standalone) into this comparison list (https://docs.google.com/spreadsheet/ccc?key=0Ao9CyUbvb2nFdHZ4RlZaQ2JwX1JsZG9vQlAtTmhvM2c#gid=0) to see how the scores compare as designed, since you mentioned it compares poorly with stock USB.


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Anaxilus.

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #23 on: September 12, 2013, 06:11:48 AM »

I mean shit, it took my wife 2 seconds to identify which one she preferred, and she didn't even know which was which.

Ah ha, the truth comes out and the wife influence factor has swung the decision in favor of the M7 completely!  :)p4

All kidding aside, if the OR is required to squeeze the best performance out of both these units, for those that don't have the luxury of this component (and the needed cabling), what would be the recommendation between these 2 units standalone? I think that also bears comparing (possibly a low priority for you right now) and worth some thoughts on. It'd be great to add the Ag M7 (standalone) into this comparison list (https://docs.google.com/spreadsheet/ccc?key=0Ao9CyUbvb2nFdHZ4RlZaQ2JwX1JsZG9vQlAtTmhvM2c#gid=0) to see how the scores compare as designed, since you mentioned it compares poorly with stock USB.

I'll be doing a thorough going over via USB and coax from my transport if that'll be of any use.  The doc will eventually get filled in I'm sure.
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twizzleraddict

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #24 on: September 12, 2013, 07:10:38 AM »

Thx Anax.

It's also strange that Paul McGowan came out with this article today on the history of Ladder DACs. http://www.pstracks.com/pauls-posts/climbing-ladder/11647/?fb_source=pubv1

"These were the classic PCM based systems we all got involved in digital audio with.  They could handle the 44.1kHz/16 bit requirements of the CD with appropriate accuracy and life was good.  The sound wasn’t so good, but life was."

lol
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SoupRKnowva

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #25 on: September 13, 2013, 12:14:53 AM »

Quote from: purrin
To Soup, for lending us the AGD

Not a problem! I'm really happy you liked it so much Marv. I knew it was something special the first time I heard it. I can't wait to hear it with the OR5 in place to compare to the stock USB, which is the only way I have ever heard it. Though I guess I feel a little bad that it made you buy a new DAC.

To bad it doesn't come in silver!   :-Z

Great to see another really good DAC at a pretty reasonable price!

I want to hear a good ladder DAC ahead of the 009...

That is exactly what I will be doing with mine. Master 7 into a KGSSHV at 500v rails with 10mAs of output bias current into the 009s. That will be my endgame rig.

Though I also have a Neko D100 Mk2 in house to compare as well just for kicks. I had read alot of good things about it and Wes is a friend, so I asked him if i could borrow it for a while to compare to the M7.

Hoping to be able to snag the new Bryston BDA-2 from a local dealer to compare as well.

But alas, all the comparing of DACs will be waiting till I receive my 009s from price japan, which should be some time in mid to late ocotober

Edit: I had also wondered what happened to all the M7 impressions, the other thread kind of died...I should check more pages than just my subscriptions more often
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Marvey

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #26 on: September 14, 2013, 04:40:19 AM »


Not a problem! I'm really happy you liked it so much Marv. I knew it was something special the first time I heard it. I can't wait to hear it with the OR5 in place to compare to the stock USB, which is the only way I have ever heard it. Though I guess I feel a little bad that it made you buy a new DAC.



Don't worry about it. I was in the market for a new DAC and I was about to buy an M7 based on Amos' experience with it. I suspected the built-in USB wasn't going to be that great and already knew the AP1 didn't do much for me. So I figured even if Amos was overly exuberant about the M7, I would probably be hearing something better with the OR5. Getting a hands on evaluation of the M7 was the next step in the process, although I have to admit I was close to ordering it myself anyways. Good for you that I don't read the HF classifieds often.


BTW, I got my unit in. Two days setup time (I asked them to reconfigure the i2s so it worked with the Empirical Audio pin-out), and four feet (instead of three). Two days shipping. It was a pleasurable experience dealing with KingWa directly.


I've since changed a few ratings in the comparison. Nothing significant though.












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SoupRKnowva

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #27 on: September 14, 2013, 11:48:51 PM »

Well good, Im happy to have helped you make up your mind. The Master 7 never ended up on the classifieds though, Darryl knew I wanted it, Id told him to message me if he ever felt like selling it.

Damn, got it already? That is pretty quick, does it sound as good right out the gate as mine did?
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Marvey

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #28 on: September 15, 2013, 06:53:35 AM »

Yeah, just left it on overnight. It sounds the same. I'm think KingWa burns the things in for two days before shipping.
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Marvey

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Re: Audio-GD Master 7 vs PWD2 Showdown (OR5 i2s)
« Reply #29 on: September 15, 2013, 06:54:40 AM »

So are you buying a M7 now, Marv?


Heh yeah. This is the DAC you think your X-Sabre sounds like.  :)p13
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