Roon with HQplayer


Awaiting your comments…

I wonder if there is a huge difference between the -2s filters and the non -2s…

If it is worth investing in a new NUC with a good i7 processor for this matter

My i7-7700HQ can play both 2s and non-2s with the poly-sinc-short-mp filter at DSD512 and I wasn’t able to hear any difference to convince me to spend big on a more powerful PC. That’s just my ears though, my system and only with that filter. So consider my observations with a bag of salt :smile:

So you have to weigh the cost (to your pocket) of being able to play non-2s filters with the reward (to your ears).

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Okay with these settings: 44.1 x 256, CUDA off. For closed form and poly-sinc-xtr-mp these are the CPU usage.

So an i7-8700 is well able to manage them without CUDA graphics card helping.

The HQP manual says the 2s filters “lowers the overall CPU load while preserving the conversion quality. “ so whether it’s worth spending money on chasing the monkey is debatable.


Thanks for sharing that.

Seems that it works like a charm with your i7-8700

Can you spot a difference in sound between a non-2s and - 2s filter?

Are you using a NUC by any chance?

And additional info:

I can’t find the post but I did read Jussi say 2s gives 99.99999% the performance of non-2s.

I’ve not been able to hear any difference between filters and 2s variants.

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No I haven’t a NUC. Here’s the full story.

I haven’t tried testing 2s vs standard. I’d doubt I’d be a key to tell the difference.


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Thanks for that

I just tried the closed form filter and it stutters for me.

The fast closed form filter works but uses like 99.9% of my cpu

Have an idea if I am missing out?

Sounding very like I have some idea what I’m talking about -

Closed form is a non-apodizing filter which if I understand correctly can sound better (or worse) depending on the original ADC used during recording. Apodizing filters show less variability. I don’t use closed from as my regular choice, this can bounce between poly-sinc-shrt and minringFIR.

However if I think something should sound better or thought it did from my memory I might try closed form, -hb or -xtr to see what happens. If I think there is a particular filter that suits an album I tag it such in Roon.

I think for some DACs Jussi says a particular filter will sound best, whether I’m correct or not I feel with my NOS DAC this has less of an impact and choice of filter is more recording dependent.

You do seem to have a very nice DAC with a cost that dwarfs that of a new NUC that will give you all the filters to 256. If you’re going to continue with HQP (and there is no 512 Lampi module) it might be well worth the money to have all filters available.

At the moment however seeing as you have just got it working, enjoy the ride and get acquainted with the various filters. There may be just one that works and you have to do no more.



I am pretty much excited about all these new features for me.

I can upgrade my Lampi to 512 but I will wait for that. I have it only a half a year.

How can I tag Jussi here for him to recommend the best filter to work with my Lampi?

Use the @ symbol and start typi Jussi and his name should come up. Just like if I type @Ofer_Elaz your name comes up.

Whether Jussi will recommends a particular filter is debatable but God loves a trier.


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I recommend taking a look at the manual… :wink:
Filters are mostly dependent on technical aspects of the filters as filters, listener’s preferences and type of music. Modulator choice is more DAC specific, mainly depending on properties of the analog filter in the DAC. If analog filter allows, using higher order modulator is better.

Since I don’t have a Lampi and I haven’t had a possibility to measure one, I cannot say much about it since I don’t know much about it’s internal implementation either.

Do you have an opinion on what modulator suits the Holo Spring DAC?


Anything goes with Spring/Cyan, because it is kind of multi-element converter plus normal analog filter, so for example ASDM7 and ASDM5 etc are completely fine.

Folks, need a bit of direction.

Would like to upsample PCM to DSD256.
Upon choosing output to SDM at the following settings, all I get a metallic muffled sound.

I have a LampiB7 and I use a Rendu.

What should I be doing differently?

Hey @Aeby_Thomas , change your max volume from 0 to -3dB

Also change your SDM rate limit to 12288000

See if that improves things

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Thank you dabassgoesboomboom.
That worked (almost) however, a bit of white noise remains.

@Aeby_Thomas The below screenshot is an old forum post but I wonder if it is still relevant here. I just did a quick google about Lampi with native and DoP DSD support, for Linux especially.

Can you enable the DoP button for your NAA backend?

If that doesn’t work try to halve the sample rate to 6144000 (which is DSD128) and with DoP enabled still. And you can try without DoP too I guess.

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Does your DAC actually have a 48k oscillator for DSD ?

I couldn’t see it referred to on the web page. Generally speaking if a DAC has a 48k DSD oscillator then the advertising will mention it. If it only has a 44.1k DSD oscillator (like my Holo Audio Spring I) then you should leave the 48k DSD box unchecked. Otherwise HQP may send it 48k DSD which it will try to play at 44.1k DSD rates. That sounds slow and noisy.

Just in case it’s not clear what I’m talking about DSD is usually expressed as multiples of a base rate; DSD 128, DSD 256 etc.

HQ Player can output DSD in multiples of both 44.1k and 48k, but not all DACs can receive 48k based DSD. Nearly all DACs have two oscillators for PCM input, one for 44.1k and the other for 48k source material. In contrast, only a few have a 48k DSD oscillators, probably because most DSD recordings use 44.1k multiple rates.

If you tell HQP that your DAC can accept 48k based DSD then when upsampling 48k based PCM source material it will output 48k multiple DSD. If you don’t check that box then HQP will convert the 48k source material to 44.1k based DSD rates.


Thanks for the ideas Andybob and dabassgoesboomboom.
Let me try and report back.

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