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Aune T1 USB Tube DAC+Amp Discussion Thread ***See first post for FAQ*** - Page 393

post #5881 of 5895
Quote:
Originally Posted by hdtv00 View Post
 

From what I understood it's not missing 24 bit support , it's more of mislabeled 24 bit support. But either way could care less if it doesn't do 24 bit /192 it's an entirely worthless upgrade and pointless product.

 

Honestly, almost all of the music I play is coming from a streaming service so it's not a big deal for me either. It doesn't even say 24 bit on the front like the Mk1s do. I just want them to stand behind their product. 

 

That 24 bit support is mislabeled though is pretty much a lie. Hopefully Massdrop doesn't take their word for it. The audio endpoint enumerates abilities at handshake time with the host, and currently the T1 isn't advertising it supports 24 bit. That's the whole point of "driverless" USB class 1 audio. The USB chip and the DAC chip should, combined together, support up to 24/96 and report that. 


Edited by milan616 - 8/29/14 at 7:33am
post #5882 of 5895
I msg'd Koolpep, who also has a T1 MK2 from Massdrop, and asked him about how his unit is functioning. He's on a Mac but his unit doesn't show 24 bit support either. He says that he uses bit perfect to scale up the audio files to 32 bit and the T1 plays fine. Not sure how that's possible tho since the dac chipset itself can't handle it.

E: I wonder if Aune is going to post this announcement on their own front page...
Edited by MrEleventy - 8/29/14 at 8:47am
post #5883 of 5895

They said the announcement would be ready by end of day in China, which should have been hours ago.

 

In other news I grabbed myself a used Sylvania 7308 (in a set with a Sylvania 6922 as well) just for kicks, since Amperex's model gets all the love. Really a step up on the treble happy Gold Lion for my AD900x I think.

post #5884 of 5895

It's nice to see your player put out 24 bit, but in reality you would need some of the most expensive equipment available and the highest quality audio recordings available to hear the difference in 16 bit vs 24 bit.  Even then I doubt you could hear any change.

 

I would bet my RCA made Amperex 6992, that if you were blindfolded and had some of the highest quality audio files out there that you could not tell any difference if I could switch back and forth between 16 bit and 24 bit.

 

Of course we all want what the product advertises, but at the end of the day 8 bits more is almost inaudible.

 

 

I thought I would share this find on Ebay, a pair of 1962 Holland Amperex Bugle Boy ($55):

 

http://www.ebay.com/itm/AMPEREX-ECC88-BUGLE-BOY-MATCH-PAIR-6DJ8-LARGE-O-GETR-TEST-NOS-VINTAGE-1962-MINTY-/231319770024?pt=Vintage_Electronics_R2&hash=item35dbbb93a8

 

It's not perfectly balanced, but it is damn close and I would bet closer than most of the tubes that are in current production.  That is insanely cheap, but the test results don't lie and I got my Siemens 6992 from the same seller. 


Edited by NCSUZoSo - 8/29/14 at 7:10pm
post #5885 of 5895

A lot of CD audio has the bulk of the sound at -20dB, leaving that much headroom.  20dB is just shy of 7 bits of linear dynamic range... which means it has effectively 9 bits except when the intensity requires the headroom.  And since it's an AC signal it has effectively an 8 bit signed quantity.  24 bits let's you run 16+ bit resolution at -20dB.

 

This comes from the silliness of linear encoding, where the lowest 9dB has all of 7 values (0 being "all signals too weak to capture"), while the top 9dB has 57344 values.

post #5886 of 5895

Massdrop provided two documents, the first being Saviaudio's eeprom programming guide and the second being Aune's settings for programming the T1 Mk2. It seriously makes no sense considering the DAC chip used and couldn't possibly do anything more than 24 bit. However, they are claiming the Mk2 does 32 bit, automatically upconverts 24 bit and magically supports DSD! :blink:

post #5887 of 5895
Maybe the guy in charge of the documentations made up the things on the spot.
post #5888 of 5895

The reason they waited so long to release the statement was to have the CEO sign off on it haha! It's a wonder these things worked at all.

post #5889 of 5895
Quote:
Originally Posted by milan616 View Post
 

Massdrop provided two documents, the first being Saviaudio's eeprom programming guide and the second being Aune's settings for programming the T1 Mk2. It seriously makes no sense considering the DAC chip used and couldn't possibly do anything more than 24 bit. However, they are claiming the Mk2 does 32 bit, automatically upconverts 24 bit and magically supports DSD! :blink:

This sounds to me like perhaps they confused the T1 mk2 with the X1 pro, which supports DSD?

 

I'm very surprised that the T1 mk2 isn't able to play 24bit 96kHz, which the mk1 does just fine...

 

Either way, I am also in agreement about 16 vs 24 bit files. I personally hear differences between vinyl and cd, but the cost of having a high quality vinyl rig can be astronomical compared to just buying a decent DAC, amp and headphones. The differences are also most likely imperfections caused by vinyl which can apparently sound really damn nice. (kind of like people who enjoy listening to tube amps vs solid state amps... I really love the tube sound)

post #5890 of 5895

I know I already showed this, but can anyone figure out why these are so cheap?

 

http://www.ebay.com/itm/AMPEREX-ECC88-BUGLE-BOY-MATCH-PAIR-6DJ8-LARGE-O-GETR-TEST-NOS-VINTAGE-1962-MINTY-/231319770024?pt=Vintage_Electronics_R2&hash=item35dbbb93a8

 

You do not find Amperex ECC88 Bugle Boys in a pair for less than $60, that isn't the normal sell rate.  I won't feel bad if someone grabs them, I am just curious and I contacted the seller.

post #5891 of 5895

Haha someone just bought it literally in front of me making an offer.

post #5892 of 5895
As an experiment, I dug out the receiver that I had when I bought these hd580's years ago. Its an early 90's denon dra-835r, paid about a g for it if I remember correctly. Anyway, I remember being blown away by the sound with the senns. Long story short, I hooked it up to the t1 and holy **** man!!! No eq needed and the soundstage got huge. This is my new set up, just have to figure out where I'm gonna put it, its huge lol
post #5893 of 5895

Yeah, 7308 with a solid amp is a potent combo. ;) My setup is just a little dark now, so when I get an incoming check I'm going to try a good Telefunken next.

post #5894 of 5895

I just won this. Best tube I had prior to this is a Gold Lion....

 

http://www.ebay.com/itm/111441757619?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

post #5895 of 5895

That looks like probably a RCA made Amperex or they just used the wrong boxes.  For example my RCA Amperex came in a RCA box, but the tube says West Germany.  Show some close ups when it arrives, it looks like a white label which should be Holland if my memory serves me correct.

 

I want to know who bought those Bugle Boys I linked to, it couldn't have been a large coincidence that I posted them and then someone bought them 5 minutes later haha.  I don't care that I missed them I am just curious who grabbed them up.  I would like to hear how they sound to whoever got them.


Edited by NCSUZoSo - Today at 10:28 am
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