Which HQP Filter are you using? [2023]

DAC is Holo May KTE

7th order modulators are good for Holo DACs, such as ASDM7EC-super, ASDM7EC-light or ADSM7ECv3.

2 Likes

That’s what I’m using on the modulator side. I was just wondering if there would be a certain filter to use with a vinyl rip. For my other listening I’m using poly sinc gauss long and hires lp on nx

That is a good choice for vinyl rips too.

2 Likes

No, on Audio Core (macOS) you have max limit to DSD256. No more.

1 Like


Can do also poly-sinc-ext2 with same Modulator ASDM5EC-light on ifiNEO iDSD
DSD512x48

4 Likes

Anyone with an M1 Max Studio, can you confirm if it will do DSD512 (Sinc-MGa / ASDM7ECv3) or do you need an Ultra for that?

I don’t think any current Apple silicon Mac will do that.

2 Likes

Thanks for clarifying. I must have misread something the other day. Guess there is really no reason to give up my trusty MMM1

After getting HQP 5 going, I switched my Holo May SDM DSD256 modulator from ASDM5ECv2 to ASDM7EC-super. Comparable server load, but improved rendering of jazz piano especially, leaving behind a slight ā€œstickinessā€ between overtones, making each note on the piano (and double bass) more layered, less smeared. Not huge effects, but consistent and beneficial. Both with tube DNA Stellaris > ZMF VeritĆ© blackood and solid-state Ferrum Oor > ZMF Caldera kingwood.

7 Likes

I’d recommend trying v3. You might like it even more than super. :smiley:

1 Like

I tried ASDM7ECv3 and ASDM7EC-super and definitely prefer super!

3 Likes

Agree!

ASDM7EC-super
1x poly-sinc-gauss-xla
Nx Sinc-Ls
DSD 512 x48
Holo Spring 3 KTE

2 Likes

You should also try ASDM7EC-v3 before committing to ASDM7EC-super. There seems to be a real split in preference between the two, all else being equal. I personally prefer -v3 over -super.

5 Likes

I’ll be on vacation next week and I’ll have plenty of time for a -v3 vs -super bakeoff, thanks all for the suggestions :grinning:

1 Like

I’ve just installed a new DAC (Mola Mola Tambaqui), which I can use over the LAN (Roon Ready) or via USB if i want to pre-process with HQP. Given that the DAC upsamples incoming PCM to 32-bit/2.8MHz, I’m not sure if HQP will actually provide any significant advantage (the DAC sounds jaw-droppingly good anyway, but very happy to try the experiment. Any suggestions then as to a starting point for HQP filters?

3 Likes

You have a lovely DAC. I was using a Chord DAC which also upsampled and I had issues with feeding HQP signals, so I decided to go NOS which is the best decision I ever made regarding DAC and signal feed with HQP​:musical_note::musical_note::musical_note:

2 Likes

Your DAC is restricting HQPlayer capabilities, since it doesn’t have bit-perfect conversion. But you can still benefit from HQPlayer’s filters, by feeding the DAC at maximum possible PCM rate it can accept over USB.

1 Like

For clarity, it accepts DSD (native or DoP) up to DSD256. I’m not entirely clear what its processing chain is for DSD after that, but if it’s remapping to 32-bit3.125MHz (not 2.8) vs 1-bit11.2896, where does the ā€˜not bit perfect’ part come in?

There is PCM rate down-conversion for DSD inputs, which then get oversampled and run through the 1-bit modulator again for the conversion stage. There’s no direct pass through of DSD data straight to the 1-bit D/A conversion stage.

DSD get’s converted to 176.4 or 352.8k PCM:

5 Likes