XXHighEnd - The Ultra HighEnd Audio Player
August 20, 2014, 10:50:35 am *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News: Dec. 31, 2012 : XXHighEnd + Phasure NOS1 DAC receive 6moons Blue Moon Award !
** "Lonely at the very top" **
Search current board structure only !!  
   Home   Help Search Login Register  
Pages: [1] 2 3 4 5 6 7 8 9 10
 1 
 on: August 15, 2014, 02:05:03 am 
Started by Scroobius - Last post by Crom
Hi,
I made a combination of a new Silverstone card and ppa card. I replaced the Silverstone clock with the ppa clock.
No final conclusion, but as I hoped the SQ is somewere in the middle of the modified ppa and Silverstone.
The Silverstone freshness, but less Sssses. But all parts are brand new, still need some time to settle.

Remark: with loom and linear psu.
Regards, Arjan

Arjan, I'm not a huge fan of the clocks that PPA uses but I'm very interested in how you connected the PPA transformer along with the PPA clock to the Silverstone card. I'm considering doing similar and if you have any pics, I'd really appreciate them.

Also, what was your final conclusion once things had run in a bit?

Cheers,
Crom

 2 
 on: August 14, 2014, 12:16:47 am 
Started by PeterSt - Last post by CoenP
And for PCI card isolation: did anyone really tested isolation? 'Cause (my case at least) as soon as card is put in slot
or molex connector is in, there is connection PCI card (gnd plane) - PC chassis. As if card's bracket is normally fitted & bolted.

Full isolation is complex, you'll need separate supplies and adequate high voltage decoupling. The NOS1a already has that.

My take is that there is a major difference in ground path that affects the voltage differential between the PC and DaC (which has an effect on the total differential between DAC an amplifier). I presume that this will be more important now since noise is less of a issue.  With the mounting plate isolated or removed the chassis will as you say be connected to the USB ground via the PCIe motherboard connection and power supplies. When connected the USB ground will stabilize around the chassis potential rather than via the more resistive path of the PCIe...

Regards, Coen

 3 
 on: August 13, 2014, 11:50:39 pm 
Started by PeterSt - Last post by CoenP
Is that 11VAC stable ? I mean, can you notice that it changes by means of *other* apparatus being switched on/off ? Like your million phone chargers, dishwasher, lights, beer tap ...

I've pulled some chargers and lamps, no fridges, pumps or washing machines (yet). I did not notice a difference. Mind you that both amp and nos have in my case no PE connected. (both float wrt earth)

Peter and Nik, to be really specific about the word "chassis", I actually measured between the signal grounds (outsides of rca connector) of the devices. Imho this is in my case the best/only way to assess how the devices float wrt each other.

Regards, Coen

 4 
 on: August 12, 2014, 03:44:30 pm 
Started by vrao - Last post by vrao
"Imaging itself I never explicitly pay attention to. However, my mentioned "air ambience" is about how all gets more separated. You can call it more accurate. So this changes the image largely, up to the orchestra suddenly "working" while before it wouldn't (get involved etc.). The image will get wider of that, but this is not what I seek. The separation, yes."

Peter,

I might have mentioned before, but I'm not sure .....

The auditory system depends on secondary, but slightly delayed reflections to solidify imaging. The "air" as you call it. This however needs to be "carefully" tailored.

VJ

 5 
 on: August 12, 2014, 11:41:27 am 
Started by vrao - Last post by PeterSt
From you first link Joachim :

Critical bands also can be explained in another way, when two sounds of equal loudness sounded separately are close together in pitch, their combined loudness when sounded together will be only slightly louder than one of them alone.  They may be said to be in the same critical band where they are competing for the same nerve endings on the basilar membrane of the inner ear.  If the two sounds are widely separated in pitch, the perceived loudness of the combined tones will be considerably greater because they do not overlap on the basilar membrane and compete for the same hair cells.  If the tones are far apart in frequency (not within a critical band), the combined sound may be perceived as twice as loud as one alone.

I can't say that I knew that ...

Thanks,
Peter

 6 
 on: August 12, 2014, 11:05:13 am 
Started by PeterSt - Last post by PeterSt
Quote
Coen, you get 47V AC or 11V AC Neutral to PE ??

Chassis to chassis, like NOS1(a) to Amp (without interconnects).

Peter

 7 
 on: August 12, 2014, 10:29:52 am 
Started by PeterSt - Last post by nik.d
Coen, you get 47V AC or 11V AC Neutral to PE ??
 
And for PCI card isolation: did anyone really tested isolation? 'Cause (my case at least) as soon as card is put in slot
or molex connector is in, there is connection PCI card (gnd plane) - PC chassis. As if card's bracket is normally fitted & bolted.

 8 
 on: August 12, 2014, 09:58:48 am 
Started by vrao - Last post by christoffe
http://www.music.miami.edu/programs/Mue/mue2003/research/mescobar/thesis/web/Psychoacoustics.htm

The most sensitive region of our ears are from 1,000 to 5,000 Hz.
What does it tell us for music reproduction?

Joachim

Edit: Also interesting to read -
http://en.wikipedia.org/wiki/Auditory_masking

 9 
 on: August 12, 2014, 08:10:44 am 
Started by vrao - Last post by PeterSt

Thank you for sharig this VJ.

Quote
Other Orelo owners can add?

As you can see at least I (or even I) have much to contribute. I guess I work differently for approach were it about the F-M settings. So, for me as the designer of it, I take it for granted that green-green-green should be the normal position/curve, never mind it is not the curve which Mr Fletcher and Munson found out for us human beings.
Still it is so that "by nature" I worked with and the dip and the highs to say orange up to red (Dip) and red (Highs respectively. So what I do today is starting out with green-green-green (flat curve) and will soon notice that something has to change, which highly depends on the music. Often it's the dip to orange first (nore Dip) and later I might set the Highs to orange (more highs). This latter could be a "compensating" matter.

Most of the time I work with "disturbance". So, when I feel things are not right, I will change e.g. like described. This can last for days until something disturbs again, and with the Dip to orange this undoubtedly will be about a too flat sound, or to dull. I now do not set the Highs to red (even more Highs) but undo the Dip (so set to green). Next, in rare occasions I may find the highs too much (too less color in them), but when so, they get back to green (flat).

This looks to be a cyclic happening.

It is very clear though that the Dip being activated takes out the higher frequency ambience of e.g. a full orchestra. This can be a matter of life and death so to speak. Let's say how all gets full with air when the dip is set to green, back from orange. In the end such phenomenon will always be the case, but for some recordings it can be too much of it but hard to describe how (now from the top of my head). Possibly too much sibilant.

Fact is that my cyclic happening mostly last for days for one setting. Meaning : it takes days to run into an album which makes me change the settings (back).
I can also say that only in very rare occasions I change a setting but change it back within a minute. This means that most of the time I guessed right where it needed to go to. And in those rare occasions I guess wrongly, I guess I throw out the album and hunt for another (read : can't be helped).

So see ? I am not looking for the best settings; I look for settings which disturb least and this is quite tolerant (or otherwise how can any setting last for many days, no matter what direction it went).

Imaging itself I never explicitly pay attention to. However, my mentioned "air ambience" is about how all gets more separated. You can call it more accurate. So this changes the image largely, up to the orchestra suddenly "working" while before it wouldn't (get involved etc.). The image will get wider of that, but this is not what I seek. The separation, yes.

That's all. Happy
Peter

 10 
 on: August 12, 2014, 07:28:33 am 
Started by PeterSt - Last post by PeterSt
Well done Coen and great that you achieved such a difference.

Is that 11VAC stable ? I mean, can you notice that it changes by means of *other* apparatus being switched on/off ? Like your million phone chargers, dishwasher, lights, beer tap ...

Pages: [1] 2 3 4 5 6 7 8 9 10
Powered by MySQL Powered by PHP Powered by SMF 1.1 RC2 | SMF © 2001-2005, Lewis Media Valid XHTML 1.0! Valid CSS!
Page created in 0.429 seconds with 15 queries.