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 on: March 30, 2015, 07:51:44 pm 
Started by PeterSt - Last post by michaeljeger
This is going to be a very different review of the Clairixa Cable.

So basically..... hooked it up...... let it run for 4 hours without listening to it.

Well, after the second song I listened to it.... I peed in my pants.....

What a difference to my old cable!!

Listening as I write.....

 on: March 30, 2015, 04:10:54 pm 
Started by PeterSt - Last post by vrao
Hi Peter,
I believe so ...

 on: March 30, 2015, 03:57:30 pm 
Started by PeterSt - Last post by PeterSt
I was waiting for newer filter, maybe what Peter had was better for the Clarixia?!

VJ, did you try that Custom filter with it ?
(I don't recall that we talked about this so I am not sure where your text (quote) springs from - or maybe we did talk about it)


 on: March 30, 2015, 03:42:36 pm 
Started by PeterSt - Last post by vrao

Update on my side.

I was waiting for newer filter, maybe what Peter had was better for the Clarixia?!

Clarixia is no longer playing in the system. I'm exclusively using AQvox for the last few weeks after my initial report. I A-B ed more extensively, and found AQvox to be more "natural" sounding. Better soundstage, smoother (natural) presentation. AQvox has been the best overall cable I've tried so far with the present version of the XXHE I'm using.


 on: March 30, 2015, 03:38:33 pm 
Started by PeterSt - Last post by PeterSt
Yes the ticking went away after I took out the resampling of x16; however thinking about it now I am going to try values from x1 to x16.

Alan, yes, I understood that. But while engaging that "Optimum" setting should not imply ticking (though I guess it can) when going back to the "mid" value of that, all should be back to normal. So something has to be seriously wrong in the first place (now).
So yes, please open a topic for that if you can't get back to normal any more.

Thanks !

 on: March 30, 2015, 03:28:33 pm 
Started by PeterSt - Last post by sondale

Yes the ticking went away after I took out the resampling of x16; however thinking about it now I am going to try values from x1 to x16.

I will leave the two USB cables as they are, i.e. change nothing else.

I will be opening a few more support threads so I will post findings in that section.


 on: March 30, 2015, 03:25:19 pm 
Started by PeterSt - Last post by PeterSt
Because I had to put it up soon anyway ...



 on: March 30, 2015, 03:23:41 pm 
Started by PeterSt - Last post by PeterSt
Wow Alan ...

Question first : Did you get rid of that ticking at normal upsampling rates ? You don't mention it. But it seems that from there (this Time Performance Index thing) did something and wasn't recoverd from. Am I correct ?

Let me know ... (and maybe start a new topic about it ?)

 on: March 30, 2015, 03:18:34 pm 
Started by PeterSt - Last post by PeterSt
Although this section should be top most, it never existed until today (March 30, 2015) because it was taken for granted that the Arc Prediction Filtering was engaged anyway and was left on for everybody. "No words needed".

The upcoming version of XXHighEnd will contain a new set of filters and this requires some attention.

Since the 1.186-i unofficial version a "Filter Designer" new functionality has been introduced. This is now more official and/but will be extended more in the future.
The filter as set in the Filter Designer will be active when the new "Custom" filter is activated.

Notice : The Custom Filter can not be used together with Phase Alignment.

The [ F ] button you see, brings you to the Filter Designer :

N.b.: Please disregard the Anti Image settings in the right bottom corner.
The fields in the left hand side suggest that "we" can apply all filter settings we like, but this is not so; the number of possibilities are infinite and we all will get crazy. Additionaly, you'd have no means of checking what you imply with the settings, apart from 999,999 out of 1,000,000 sounding wrong.
What was done instead is that "Pre-selections" have been provided, while we over here in the "XXHighEnd labs" can use the fields to create them *and* check with analyzers. So here's what's current in there for Pre-selections :

What you are the settings for the fields you saw in the before last screenshot plus some descriptive information (the part behind the last | character).

What the current new filters all do is actually making use of Arc Prediction which is 100% serving the time domain (no pre- and post ringing) to "shape" that into something which is more serving the frequency domain than what Arc Prediction alone can achieve. Still no visible ringing is in order while the THD (Total Harmonic Distortion) of the higher frequencies vastly improves. Now notice the "trick" here :
If we first assume that Arc Prediction is the very best sounding filter around anyway (and knowing that the number of people who do not and use the Phasure NOS1(a) D/A converter can be counted on one finger at this moment) then it can only get better as long as we can prevent the ringing.

The real thing to let his happen is to disobey the normally taken for granted 20KHz limit of hearing and "shape" more of frequency below that. This assumed that "we" can not hear above e.g. 16KHz anyway and thus we can just as well limit the output level of that. This, while Arc Prediction has a more difficult time just *above* that frequency. So notice that normal Arc Prediction folds back a little into the audio band regarding Aliasing once above 16KHz and let's assume this is audible (it officially *is* distortion, and is now in the audio band, so ...). If we now use the audio band itself for where the roll off of the filter is allowed to start, then we can have very slowly rolling off filters which actually do not ring at all that we can notice (measurement);

If we look again at the last screen shot, we see for example "Mid for 705600/768000 / 2.21% - 3.9dB". The 2.21% indicates the measured distortion at 16KHz. The -3.9dB tells that 16KHz is 3.9dB down in level compared to what it should be (at say 1KHz). Two things happened at the same time here :
1. The distortion is lower than it originally was (was in the 5%);
2. The level of the signal is down meanwhile.
So one and the same means improves from two angles. Notice though that this example assumes that "we" won't be able to hear the 16KHz anyway, so what's happening really ?

For that look at the last part of the description of the example, the 0.22% -0.1dB. This now is the measured distortion at 12KHz and how much down that is. And, we 100% assume now that everybody is able to perceive 12KHz very well (may not be so either but alas). So what we did for the net result is improving on the 12KHz again vastly (think 6-9dB of less distortion in this case) per the "means" of not wanting to hear 16KHz anyway.
Not to forget : this is all without additional ringing which otherwise is impossible.

What we also see in the description of the example is the term "Mid". This means that this is a filter which implies a "mid average" roll off. If we compare with the others then you can see it in the frequency which is set for the -3dB Roll Off point. But watch out, because this is a general term and it is not really true (but depending on the filter). See for example the "Low" of 705600/768000 where this point is set at 12220 while the roll off at 12KHz is still only 0.1dB. Still, distortion figures are lower for this filter *and* 16KHz surely is more attenuated.

For each of the upsampling rates a High, Mid and Low filter has been attempted but for 352800/384000 no Mid is "available". Available ?
Yes, available for no phase changes. So, all the filters provided are 100% Linear Phase which right away is the reason why you can not do this yourself (set randomly nice settings). Notice that it takes "days" to find the precise settings, which in the end are (and were) tuned per 10Hz of the roll off point. And/but if you look at the "High" for the 176400/192000 filter, you see the notation "Phase slightly off". Now, this filter was allowed but with this remark, because no other Linear Phase filter could be found for the "High" setting and otherwise there wouldn't be one (provided).

On a side note, from this we can also learn that the higher the upsampling rate, the more possibilities exist. For example, for the 705600/768000 upsampling, 14 Linear Phase filters were found and we just provided the best regarding the distortion and attenuation combination.

 on: March 30, 2015, 03:11:28 pm 
Started by PeterSt - Last post by sondale
 Diary of a Break-In

Please note that the following relates to using TWO USB cables to run my iFi iDAC and iDSD Micro; at the start point I had not removed services nor used MinimizeOS.

Day 1 - the cables arrive and both are put into the system replacing the iFi supplied cables. Initial thoughts were nothing much changed, slightly thicker sound in the mid, perhaps a touch more detail at the top and possibly a little more bass. I ran this for a couple of hours only.

Day 2 - Dynamics have improved, for instance on Michael Hedges 'Aerial Boundaries' when he plucks the strings or raps the guitar body the effect is visceral, it reminds me of my best vinyl setup. Bass is extended but tight, top end is nicely detailed. Played Piano, Orchestral, Jazz - all sounding better than yesterday.

Day 3 - I decided to set Time Performance Index to Optimal, rebooted, all seemed OK for a few minutes and then I noticed some low level ticking noises and distortion. I checked the connections, rebooted the pc, no change. So I reset TPI, rebooted, played the same music - the low-level ticking is still present as is the distortion. I went from x16 upsampling back down to x1, i.e. Redbook, and the ticking/distortion went away. I know that in my days running cMP2 I always ended up running without any upsampling. NOW the imaging is all over the place, front to back is reduced, central images are a little indistinct sounding almost out of phase. After a while of head scratching I took the cables out of the system and watched the TV for the rest of the evening. At midnight I relented, put the cables back in, set the pc to repeatedly play a Telarc sampler and left it to run overnight.

Day 4. What an improvement, sounding better in all ways, imaging, detail, bass. Played some choral works - groups of voices and individual voices are easier to hear and locate.

Day 5. Only manages to listen to some Arvo Part - quietly - again good imaging, detail, vocals.

Day 6. Trying to sort out a neighbour's subwoofer.

Day 7. Oh dear - back to the thick voices - just listening to Suzanne Vega - Tom's Diner - sounds a little chesty as if she is getting a cold. I have just read 'boleary's' post and I can relate to most of his findings (at least today!). OK today may be because it is a weekday when the mains is at its worst but so was day 2.

What is that Chinese curse? 'May you live in interesting times'.

The iFi dac is normally powered by the iUSB, but just for the sake of identifying any other problems I will run it battery only which removes one of the new cables.

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