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Author Topic: Q parameter settings revisited  (Read 2292 times)
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ivo
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« on: February 11, 2010, 06:09:52 pm »

Hey people,

I guess its time to refresh our experiences with Qs. So, I use Q1=14, others set to 15. If I move others down to 0, then my playback gets interrupted occasionally for 0,5 s and the same happens if I move down Q1 to 4. However if I run DPC Latency checker then I am below 100 mikro seconds on my laptop without any spikes.

Actually, I like the sound of 4/0/0/0/0 but I must pay the interruption price for this. So, wanted also to ask if 4/17/17/0/0 is still popular setting?

Also, my DAC chip is PCM1798 (BurrBrown), so anybody having BurrBrowns, post your Qs here please.

So, basically wanted also opinions on how you adapt your Qs to the latest features like DAP, QAP and KS!

Thanks,
Ivo
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Music on internal HDD in FLAC-->LatestXX in QAP + PeakExt Mode[KS,Adaptive,2048,Q1=14,xQ1=1,Sch3,Low,Realtime,15 ms, SFS 2-400, Straight, stop all, MinOS]-->Windows 7 Pro SP1 x64bit-->Intel i5 based laptop [8 GB RAM]-->JKDAC32(HiFace based USB-I2S-DAC)-->Denon PMA-1500AE-->JBL E90 3-way speakers
PeterSt
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« Reply #1 on: February 12, 2010, 10:15:00 am »

Maybe I can help you with these few things :

First off, LatencyChecker is a kind of useless here, but, it depends on what you try to observe from it. For example, if the playback thread runs on such a high priority that the LatencyChecker reports a high latency, it is because of just that (the playback) and it is a good thing.
I could post many more examples, but they all need too much inside information, and you won't be able to interpret it properly otherwise.
Maybe it helps if I tell you I will never use it during playback.
Also note that reports of people are known that the reported latency siginificantly drops at the moment playback starts. I can explain that, but with the only conclusion the LatencyChecker is useless for this.

Quote
If I move others down to 0, then my playback gets interrupted occasionally for 0,5 s

This shows how complex it actually is, but which you will observe as such only when you know what happens with those Q2/3/4/5.
Well, I guess it is sufficient for you to know that they add. Thus, because of added "processes" your interruptions can get less. How come ? task switching, idle times, interrupts, keeping things alive, etc.
Notice that those Qs were never meant to play a role at this (interruption of sound) level, but once you don't have the interrupts, they internally still play the same role but now far more on the micro level. Thus, the level that bits stay bits but sound different because of, well, ... fill that in yourself. It just does.
Watch out now : it is *not* my intention that everybody with interrupts starts moving those Q sliders in order to get rid of it interrupts. You will get crazy ... So, in this case you first incurred for the interrupts deliberately (find that Special Mode) and next try to get rid of them via a backdoor solution. No. As I told in the other topic, this is a too tedious operation for us actually wanting to listen to music. So I will try to automate it.

Peter


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For the Stealth LPS PC :
W10-14393.0 - November 13, 2017 (2.09)
XXHighEnd Mach II Stealth LPS PC -> Xeon E5 2640v4 with Hyperthreading On (20 cores) @~720MHz, 32GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = *30*/-/*1*/*1*/*1*/ Q1Factor = *40* / Dev.Buffer = 4096 / ClockRes = *15ms* / Memory = Straight Contiguous / Include Garbage Collect / SFS = *0.90*  (max 120) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / *OSD Off* / Running Time Off / Minimize OS / XTweaks : Balanced Load = 43 / Nervous Rate = 100 / Cool when Idle = n.a / Provide Stable Power = 0 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / *Custom Filtering Highest for 705600* / Always Clear Proxy before Playbck = On -> USB3 from MoBo -> Lush USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (*8ms*) -> B'ASS Current Amplifier -> Blaxius Interlink -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere (also from the PC).

For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.

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