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Audiophilleo 1 and 2 USB to S/PDIF transport - Page 50

post #736 of 1170

My transport is based on the original Hiface 1, but still would be interesting to see if the new hiface uses a hardware buffer.

post #737 of 1170
I sent my audiophilio 1 for the pure power mod, I will let u know what I hear.
post #738 of 1170
I also just ordered the PurePower upgrade package. I'll send my AP2 back in the mail tomorrow, which will probably take two or three weeks to get back most likely. It will be interesting trying to get by without in the meantime.

I have been using the Aqvox for six months or so. I'll leave impressions of the PurePower when I get it.
post #739 of 1170
Quote:
Originally Posted by drez View Post

^ Very interesting, I think I have seen a couple of DAC's that use internal hardware buffer, but this seems to be more common in the very expensive models.  Audiophilleo certainly seems to be ahead in terms of hardware and measured performance - I would certainly like to compare one to my modified Hiface with ultra short USB cable.  Only problem is I feel compelled to save for the full-blown purepower package rather than buying the standard AP2 and upgrading later.  Still would be interesting to compare a stock AP2 purely for a perspective of price/performance between the units.

 

You may be right in that the HiFace uses software buffer rather than hardware.  If one has a look at the PCB one may be able to notice the presence or absence of memory - or I could email HiFace to ask - but either way I'm sure the hardware is not nearly as powerful as the Audiophilleo and is several years old.

 

I have never quite understood why more DACs don't use an internal buffer.

 

There are only two drawbacks to having a buffer in the DAC:

 

1) The buffer will necessarily introduce delay. Since the data is arriving at the DAC at a fixed rate controlled by something else (with all except asynch USB), the buffer has to be big enough that it can store enough data that it won't run out if the source clock is running a tiny bit slower than the DAC's clock. (With asynch USB, or the buffer inside a CD player, the buffer can "call for" more data is it runs low...) Since you have to fill the buffer before you start playing, there will have to be a delay before you start playing equal to the size of the buffer - but we're only talking about a few seconds delay on each track.

2) Obviously, if you have a buffer in the DAC, then the DAC has to have its own clock; and, if the DAC supports multiple sample rates, it will have to be able to recognize which clock to use, and then have a clock available at each sample rate it needs.

 

The benefits, however, are huge. Quite simply, if you have a buffer, and your own clock, then you are TOTALLY immune to jitter. Since you're entirely discarding the original clock, the only jitter you're going to have is the jitter that your own clock has - which is under your control and will be source-independent.

 

The first issue (delay) would be a big deal for a recording studio, where you need to time-match things, but shouldn't matter at all to an audiophile.

post #740 of 1170
My AP2 should have arrived at Audiophilleo today. Lucky for me, the turnaround is now much quicker than it has been in the past. Philip quoted me a turnaround time of only three business days.

I tried listening to my setup for the first time without my AP2 ( still used Aqvox alone) in a very long time. Holy cow, what a difference. The music was still very clear, but totally lacking in musicality and engagement. It felt dull and lifeless compared to what I am used to with my AP2. The difference is easily more noticeable than I remember observing when the AP2 was new. The fact that my musical experience is so much worse despite still using my excellent $2,000 Woo Audio WA22 amp with premium tubes is surprising.
post #741 of 1170

ok, I'm an idiot.  I've long been ignoring these products but I just decided to try them out.  I almost ordered the ap2 with pure power until I realized I was looking for a COAX reclocker but the AP doesn't take a COAX input.

 

I use my OPPO as my media controller so I guess this is out.
 

post #742 of 1170
Quote:
Originally Posted by tme110 View Post

ok, I'm an idiot.  I've long been ignoring these products but I just decided to try them out.  I almost ordered the ap2 with pure power until I realized I was looking for a COAX reclocker but the AP doesn't take a COAX input.

 

I use my OPPO as my media controller so I guess this is out.
 

Empirical's Synchro Mesh will do that for $599. No need for a battery supply either.

 

http://www.6moons.com/audioreviews/empirical4/1.html

post #743 of 1170

Any updates from AP owners who have gotten the Pure Power modification?

post #744 of 1170
Mine is on the mail , I will have Saturday when I get home .
I will let u guys know what differences I hear.
post #745 of 1170
Quote:
Originally Posted by DaveBSC View Post

Empirical's Synchro Mesh will do that for $599. No need for a battery supply either.

 

http://www.6moons.com/audioreviews/empirical4/1.html


yea, there's a couple 'converters' that will do it but that's a new one so I'll check it out.

post #746 of 1170

My PurePower just came in today. It might take me a day or two to be able to get a good listening session in, but here is a picture of it installed. It's the blue box next to my DAC. You can see it connecting to the AP2 directly.

 

photo(2).JPG

post #747 of 1170
The PurePower is an awesome little unit. It feels really substantial and durable with a great chassis and nice fit and finish. As others have reported here, it's a notable step up from the AQVOX (which was in itself a nice improvement over AP2 stock). Coming straight from the AP1/2 to the PurePower would seem like an awesome improvement without having had the Aqvox in between.

The additional improvements are similar to those the AQVOX brought, only better. I am getting a very black background, effortless low level detail, and an organic/musical touch that adds much more of an immersive experience to my ears. Compared to my setup sounding awful while the AP2 was away getting modded, it sounds glorious right now.

I'll have to post my AQVOX in the for sale forums tomorrow and save some lucky chap an arm and a leg in shipping from Germany. It cost me $75 to ship the dumb thing from Germany this last Christmas :0.
post #748 of 1170
Thread Starter 

My wallet didn't want to hear this. Just purchased a long Firewire cable so I can use my ULN-2 as a transport in the mean time while I wait for the upgrade.

post #749 of 1170
Quote:
Originally Posted by Sid-Fi View Post

The PurePower is an awesome little unit. It feels really substantial and durable with a great chassis and nice fit and finish. As others have reported here, it's a notable step up from the AQVOX (which was in itself a nice improvement over AP2 stock). Coming straight from the AP1/2 to the PurePower would seem like an awesome improvement without having had the Aqvox in between.
The additional improvements are similar to those the AQVOX brought, only better. I am getting a very black background, effortless low level detail, and an organic/musical touch that adds much more of an immersive experience to my ears. Compared to my setup sounding awful while the AP2 was away getting modded, it sounds glorious right now.
I'll have to post my AQVOX in the for sale forums tomorrow and save some lucky chap an arm and a leg in shipping from Germany. It cost me $75 to ship the dumb thing from Germany this last Christmas :0.

 

Have you tried the purepower with and without the aqvox?  I am interested if there is a difference as from my understanding purepower powers the clocks and SPDIF output but not the USB receiver, probably for a good reason but still would be interesting to see if there is a difference.

 

I think I will buy Purepower and AP2 once I sell my NFB-10 SE - transients in my system are still not quite clean enough as it is.  Empirical Audio will soon have an interesting device that sorts out computer ground related issues, might be a good alternative to galvanic isolation.

post #750 of 1170
Quote:
Originally Posted by drez View Post

Have you tried the purepower with and without the aqvox?  I am interested if there is a difference as from my understanding purepower powers the clocks and SPDIF output but not the USB receiver, probably for a good reason but still would be interesting to see if there is a difference.

Aqvox will do nothing as PurePower powers the lot. And if not charging the battery in idle time the USB power line is electrically disconnected by relays. It's all on the PurePower web page.
Edited by HumanMedia - 7/1/12 at 5:36am
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