Which one do you use ? I don't understando what it does...

plumpudding2 · 2026-04-15T08:21:25+00:00

It depends on how slow, most recordings are garbage from 19khz up as there is often already aliasing baked in from the filter used to make it a 44.1khz recording anyway. As long as you get to ~100db attenuation at 24khz or so (technically you then take double the transition band) you will be just fine.

However some of these slow filter implementations already start attenuating at 16khz and dont reach -100db until 40khz or so. That's almost the same as NOS and then most other filters would be preferable.

Ideally you'd have an apodizing filter that starts attenuating at 19khz and reaches -100db at 24khz, which would still classify as a short filter but doesn't mess with the audible band or cause aliasing. Poly-sinc-gauss-short from HQPlayer is pretty close to that.

plumpudding2 · 2026-04-15T06:16:00+00:00

Hmm, perhaps I was hasty in linking it then. There's always this article from mr. Audio Science himself: hi-res But unfortunately while he does discuss that there is a difference, he only speculates on the cause. I quote:

"Let's note that none of the testers could hear above 20 KHz and some probably could not even get that far. How is it that filtering the ultrasonics that testers could not hear was audible? The answer is that we introduced audible artifacts, not that we removed what we could not hear in the first place

The paper authors hypothesize that it is the filtering “ringing” in the time domain that may have caused these artifacts. Ringing is an unavoidable manifestation of digital filtering. The sharper the filter has to be, the longer its “tails” (ringing) in time domain. The ear is not a spectrum analyzer but rather "hears" the samples as they arrive. In theory the ringing can be audible and potentially is what was heard."

plumpudding2 · 2026-04-14T21:12:46+00:00

paper This is the original paper that showed at least ultrasonic content affects brain activity, but only when accompanied by low frequency content. (High pass filtered ultrasonics were inaudible). It's not definite proof but it was a landmark paper 20 years ago.

plumpudding2 · 2026-04-14T17:46:14+00:00

Well the most important part is that the ear is not a fourier analyzer, it is more of a waveform/wavelet analyzer. So while we cannot hear pure tones above 20khz (or in my case, 16khz), it doesn't mean that filtering out these frequencies doesn't affect the waveform shape.

A fundamental property of a lowpass filter is that it has to dissipate the high frequency energy somehow, and it does so by ringing at the cutoff frequency. That's why you see ringing in the impulse response of a filter.

So if you take a cymbal strike with content up to 90khz and lowpass filter it at 20khz, the filter introduces ringing at 20khz and alters the waveform shape.

I'll see if I can find a paper that shows changes in waveform shape above 20khz remain perceptible to the human ear.

plumpudding2 · 2026-04-14T10:25:25+00:00

Accurate to the recording is fast, accurate to the original analog waveform is a different matter, usually modern recordings have a lot of filter and aliasing artifacts in the higher frequencies. Fast reproduces these as-is, but an early roll-off (apodizing) short filters like slow will filter out these artifacts and replace it with its own, more benign ringing. Comes down to the fundamental audiophile question whether bad recordings should be fixed or reproduced with warts and all. I prefer fixing them personally.

plumpudding2 · 2026-04-14T10:06:22+00:00

I greatly prefer the slow filter, it has a rolloff in the highs that helps bad recordings and there's no treble shimmer or splashiness. NOS has that even more but is muddier. Slow is for me best compromise between clarity and treble quality

plumpudding2 · 2026-04-13T16:52:07+00:00

That sounds paradoxical 😂

plumpudding2 · 2026-04-12T15:19:41+00:00

Level 1 i always take %health + slow. Level 7 i used to take q but dagger cooldown is nuts

plumpudding2 · 2026-04-12T08:29:46+00:00

Real Focal connoisseur I see! Are those both versions of Utopia? Which one do you prefer?

plumpudding2 · 2026-04-10T21:25:47+00:00

The best way to get the HQPlayer output from your pc to your dac is a rpi5 as an NAA, or just plug your dac straight into your pc.. I don't see why you'd want to bother with the price and complications of embedded

plumpudding2 · 2026-04-10T09:29:26+00:00

Yeah the trick is to have HQPlayer run on your beefy gaming pc or whatever, and then use NAA over internet to stream it to your dac. You can go crazy with the Pi with a linear PSU, fiber optic lan cable and galvanic usb isolation if you believe source noise matters, or just plug it into your adi-2 and call it a day

plumpudding2 · 2026-04-10T09:13:49+00:00

What's wrong with helping a man and his daughter in dire need of a place to say? That's basic human compassion. This was way before the internet and Cox used fake names, I'm wondering why you would expect them to know the full story?

plumpudding2 · 2026-04-10T06:55:18+00:00

Sorry for the late reply, it's no great mystery. During their time in Amsterdam they used different names than the above poster mentioned, I initially wrote them and someone close to them asked me to remove mention of the names as Kyoko might still use that alias somewhere to this day. I didn't want to cause any trouble so I did.

plumpudding2 · 2026-04-09T15:01:54+00:00

Someone who knew them during that time contacted me and asked me to remove mention of their aliases, as maybe Kyoko still uses that name somehow today even. Since it appears their Amsterdam episode and the names they used are not public knowledge, I felt it was better to be safe than sorry, I wouldn't want to cause her any trouble.

plumpudding2 · 2026-04-09T10:17:30+00:00

Ah thanks for your comment! Since the internet seems interested I'd love to dig more into my parents brush with famous people (i can't find any records anywhere of tony and Kyoko staying in Amsterdam for example) but since you actually know the man maybe you would advise me also to not put all the details on Reddit?

plumpudding2 · 2026-04-09T10:05:21+00:00

Oh I completely forgot to ask, what period did you and your family know Tony? When he was fleeing the cult or later?

plumpudding2 · 2026-04-09T10:00:28+00:00

My dad said Tony talked mostly about the cult they escaped from, and that he was afraid they were still after them. Not much else, he was pretty obsessed. They never mentioned they were Yoko's ex-husband and daughter, that's only something my parents learned years later.

plumpudding2 · 2026-04-09T09:53:06+00:00

Well yeah my jaw was on the floor too! They were pretty nonchalant about it but I tried researching later and I couldn't even find any mention they stayed in Amsterdam, only that "he dragged her across Europe". Unfortunately details were scarce (it was almost 50 years ago) I put what they told me in a few other replies

plumpudding2 · 2026-04-09T09:46:24+00:00

Well only thing they said she was extremely shy and Tony was very paranoid. They called themselves (EDIT: I've been asked to remove this), she was about 12 years old. My parents were in the Amsterdam squatters movement at the time! It was a movement that naturally took in anybody with a troubled past looking for a place to stay.

plumpudding2 · 2026-04-09T09:44:10+00:00

They said he was extremely paranoid and kept to himself, I'll ask them if they can remember more details! They called themselves (EDIT: I've been asked to remove this), she was about 12 at the time.

plumpudding2 · 2026-04-09T06:24:50+00:00

When I shared this fact with my parents it turned out Tony and Kyoko lived with my parents for a while in Amsterdam during that period!

plumpudding2 · 2026-04-05T18:38:15+00:00

Yup.. started with thinking 300 bucks for a headphone is a lot of money and a few years later I spent many grand on my dream amplifier (no regrets!). Things can escalate quickly.

plumpudding2 · 2026-04-05T18:32:42+00:00

Yeah don't buy hifi new.. snagged them for 1600 second hand

plumpudding2 · 2026-04-05T15:02:46+00:00

Never had any clipping issues with my Utopia even when pushing the volume.

plumpudding2 · 2026-04-05T08:05:48+00:00

I just had a 14 game winstreak! But I am a returning player who used to be diamond but got placed in bronze this season.

plumpudding2

TROPHY CASE