soundcheck's Purifi amplifier

Let's talk a bit about amplifiers. I owned numerous devices. Commercial and DIY. Jeff Rowland, Anaview Abletec, Hypex,  T-amps, SMSL and the list goes on and on. I tried many of those ebay Class-D modules. I tried all kind of power supplies (connex/hypex/linears, ...), I tried several full digital amps. and I compared these to even more amps owned by audiophile friends of mine. 

Oh dear. What a career. I swapped Class-D output transformers with Mundorf coils, replaced rectifiers, cabling, fuses connectors, power cables and the tweak list goes on and on.

And finally I got hooked up to a  Purifi Audio Eigentakt 1ET400A Stereo Eval1 amp integrated into a Ghent Audio case.

I am running this amp for more than a year by now. Puh. What a journey.

Gustard V18 vs. Allo Katana - a 2022 assessment

For almost a year or so I am running an IMO excellent Gustard A18 DAC.  The Gustard builds around the top of the line AKM AK4499 and Accusilicon clocks.  The DAC received quite some nice reviews confirming my experience with it.  Most reviewers saw that DAC challenging much pricier rivals. Until now I was never in doubt about the overall DAC performance...

audio@advise passes 1.000.000 site visits


...just figured that the site visit counter of blogger passed the 1.000.000 for audio@vise!!!

I thought it'd be worth mentioning. 

sKit and pCP81 - regression test successful

On December 5th  pCP 8.1 was released.

I just did a sKit regression test on my RPi4. I used the 64 bit version.

And I did a maiden installation.

It all went OK. Not a single hiccup! Great.

Releasing 1.4 for test

I just uploaded a seriously modified version 1.4 of

(UPDATE Nov-12-21 - I uploaded 1.4.2-beta. It comes with a few minor corrections, slightly enhanced stability and traceability)

squeezelite - update - flac processing improvement

 Hi there.

Just recently a small - potentially interesting - performance enhancement for flac processing had been introduced.
Those of you who run sKit and a (my) custom squeezelite binary should update the binary.

I did update my own squeezelite branch on github accordingly.

I havn't tested what the update does - performance and soundwise - though.

If you run the update and experience some improvement - please let me/us know.


The audiophile power of Youtube

Did you ever realize that you can easily discern sound quality differences on most of these numerous audiophile a/b device comparisons over @

introducing sKit 1.5

Hi there.

I uploaded a new version (1.5.) of sKit.

Full Digital Amp News

In 2012 I wrote an article about Full Digital Amps. I just updated it a little.  That's one part of the news.

During those days I was trying and tweaking several of these FDAs. I really liked the technology and the idea behind it. And they sounded extremely clean and dynamic already back then. IMO cleaner and more dynamic then most DAC-amp combos I had listened to. In the article I describe what I didn't like and why I left that idea alone. Just to mention it: It was mainly due to the mediocre digital pre-stages of these amps. These amps also need top notch USB receivers, filters, clocks, DSP/SRC, power supplies, regulation, layouts, isolation etc. During those days that's IMO been a major weak spot. 

I still kept watching for developments. Not much was happening over the years.

Everything that matters...

"Not everything that matters, can be measured. Not everything that can be measured, matters"

That's a slightly adopted quote of Albert Einstein. ;)

introducing sKit 1.4 (beta)

Hi folks.

I worked a little on sKit to make it more convenient and stable.

* most of the tweaks get automatically installed now
   no real need to dig into the Audio Streaming series anymore. 

* sKit-manager remove function - removes everything from now on
   there shouldn't be any sKit trace left anymore once that is done.

What's basically left for to you do is

  1. you install a fresh pCP image,
  2. increase it to at least 200MB, 
  3. configure your audio interface via WEB-UI and
  4. install sKit

 At that point you should have a well tuned system up'n running.

On 1.4 I added some changes to the affinity tweak. I now assign squeezelite to
CPU 1 and 2 without isolating these CPUs anymore.

The documentation also got updated. And of course this or that error got corrected.

sKit 1.4 needs a fresh pCP install as base. Using sKit-manager update won't work. Sorry for that.

sKit 1.4 is still beta. I'll wait for 2 weeks for feedback before officially releasing sKit 1.4. I count on your feedback.


introducing sKit 1.1

 I've added some interesting new features to sKit (1.1).

introducing soundcheck's tuning kit - pCP (sKit) 1.0

 I'd like to introduce the first release of soundcheck's tuning kit - pCP (sKit) .

sKit provides a small and potentially growing number of little tools that'll help to setup piCorePlayer 7.0+ and Rpi4  and 3 in line with the advanced tuning recommendations outlined in my Audio Streaming Series.

The underlying idea is to take quite a basic operating system like piCorePlayer and tune it that way that it'll provide you with the best possible performance -- challenging most other (audiophile) OSes and streaming solutions out there.

This is not just another of these meanwhile numerous "audiophile" operating system out there though. In principle these do nothing else then applying this or that tweak you'll also find on this blog for years. The idea is to provide you with a tuning kit instead. You take it and apply it to that standard operating system installation yourself. And sKit supports you on that. 

You'll put yourself in the driver seat. And you control the pace.

sKit already goes slightly beyond the earlier outlined Audio Streaming Series scope. You should still go through the Audio Streaming Series step-by-step though. sKit doesn't cover all settings yet. At the relevant spots inside the Audio Streaming Series I refer to sKit.

sKit 1.0

I hope you'll enjoy the results.


volume control - linear - pro-audio style

Ever thought about volume controls (VC)? they work? volume controls in particular?

or... you simply slide your VCs up'n down enjoying the sound level getting up'n down !?!? 

Audio meets IoT (DIY)

I am running RPis and (HAT) DACs for years by now. One thing's been bothering me all the time. 

The powering scheme. The handling of it to be exact. I've still been pulling plugs all the time for that very purpose. Pulling plugs in a lab is one thing, doing that in a living room is simply not acceptable on the long run. How do you tell your wife or kids how to turn on that DIY monster-stereo !?!? Push that plug, next this one and finally that one. Simply not possible.

I finally thought to get some Wifi controlled mains plugs in place. Neither Dect, infrared nor bluetooth controlled devices made it on my wishlist.

Let see what IoT (Internet of Things) projects are offering...

RPI - All lights off

I just thought it would be nice to share with you
how to get a lighthouse tower like the RPI to pretend being dead.

Unfortunately even the most current RPI operating systems 
doesn't offer such a trivial and nice tweak via user interface. 

That leaves us only one option: Commandline intervention!


(Latest Update: Oct-2020)

Anybody out there still ripping CDs? Or is it just me. ;)

Recently I figured that some tracks were missing. No idea when and why this happened. OK. Quick decision taken. Re-Rip the affected CDs. Yep - I still keep my CDs in the attic.

Gee Wiz... Re-Ripping a track "quickly" turned out into a major exercise (nightmare).

This article gives some background info and directions related to CD ripping and CD tagging.

networking - RPI dongle your net

I'd like to share an - IMO - nice alternative network setup solution for the RPI3 (It'll also work on the Pi Zero).

The solution will nicely add to, or you might also call it  - enhance -, earlier described networking solution.