Sunday, 31 July 2022

Pacific Audio Fest 2022 (PAF 2022) - Day 2

The elevators heading up to the 13th & 14th floors of the PAF, and a view from elevator. Glorious hot 25-30°C weekend. IMO, we who live in the N.W. / Western Canada should never complain of the few days we get every year of the heat! So long as we don't hit closer to 40°C like last year's "heat dome"...

In total, I spent 2 days at Pacific Audio Fest 2022. The pictures and comments here will cover some of what I saw and general impressions for those rooms. See the Day 1 post as well.

Let's get going!

Saturday, 30 July 2022

Pacific Audio Fest 2022 (PAF 2022) - Day 1

Hey there everyone, it's Pacific Audio Fest 2022 time here in Seattle! Since it was just a 3-hour drive from home in Vancouver, I figure it would be fun to check out the inaugural PAF this year. The last time I was at an audio show was back in 2019 for what would become the last Rocky Mountain Audio Fest - who knew!

My understanding is that PAF under the direction of Lou Hinkley brings with it experience from Capital Audio Fest held in Washington DC (which will be held this year November 11-13).

I think the audio geeks here in the Pacific Northwest and Western Canada appreciates the availability of an easily-accessible show in this part of the world to check out and listen to some of the latest (and greatest) the industry has on offer.

Saturday, 23 July 2022

Summer Musings: On Stereophile's "Quackery, Gullibility, and Open-mindedness". Nature of audio devices. Truths in audio (and medicine).

Well ladies and gents, I guess it's official. Stereophile, at least in part, is not a journalistic venture based on a recent "My Back Pages" article. In the opening 3 paragraphs of "Quackery, Gullibility, and Open-mindedness", Rogier van Bakel basically discards the importance of skepticism as a journalist, and seems to set the stage for audiophiles to accept basically all manners of quackery and snake oil.

For those who have been on this blog over the years, you probably know that I'm a physician working here in Vancouver, Canada. I write these audio musings and technical review articles as part of my audio hobby/journey to go beyond enjoying the music as a consumer, towards further understanding of how the technologies work, with the hope that the results of the explorations may be helpful for other pilgrims along this path as we discuss hardware and improving sonic fidelity.

On quiet evenings when the kids are asleep and my wife is enjoying her TV dramas, examination of electrical devices and their waveforms can provide a much-needed distraction from the marvelous yet frequently incomprehensible complexity of human physical and mental states.

Saturday, 16 July 2022

REVIEW: MeLE Quieter3Q (Celeron N5105, 8GB DDR4, 256GB eMMC) MiniPC: Fanless, 4K/HDR streaming. Getting closer! (Thoughts on Apple's M1 Mini as HTPC.)

Yeah, that's an old XBOX 360 Kinect camera back there! Hey, there are cool things you can do with this as a 3D scanner...

Greetings ladies and gents. In the posts for both the MeLE Quieter2Q post as well as just last week with the Beelink SER4 Ryzen 7 4700U computer review (BTW, I added an addendum - HDR10 works on that machine), I noticed questions, comments, and E-mails about utilization of these MiniPCs in the home theater setting; specifically video and HDR features.

Recently, I saw the availability of the MeLE Quieter3Q fanless MiniPC (currently around US$250). With the various feature upgrades, I figure that this is one which might qualify as a reasonable HTPC computer given that it features HDR video capabilities and a bit more CPU processing power. As such, I decided to take it for a spin. I bought the slightly more expensive 256GB eMMC storage model; since I am targeting video playback, it might be nice to have some extra storage for local data.

Much of what I said about the Quieter2Q applies here, so let's focus on performance differences and discuss this machine as a video streamer beyond audio purposes...

Saturday, 9 July 2022

REVIEW: Beelink SER4 Ryzen 7 4700U (8C/8T) MiniPC - A small, quiet, fast, general "workhorse" PC... [Addendum: HDR works.]

These days, if we look around most homes, I think we'll see all kinds of computers used for different purposes in the rooms. I've talked about my main Workstation, the Server machine, even my Gaming rig a number of years back (much of that upgraded since). And a few months ago, we talked about the very low power fanless Celeron MeLE Quieter2Q which functions as a very stable stereo/multichannel streamer for Roon.

[BTW, there is an upgraded MeLE Quieter3Q now which is faster by ~30-40% featuring the Celeron N5105 processor for a few more dollars, but still no AVX2 if you're thinking about Windows HQPlayer as discussed here.]

Recently, I've been wanting to upgrade my 2016 Intel NUC 6i5SYH which in the last few years has been the heart of the audio measurements rig. Over time, as my measurement regimen has become more detailed, often using larger FFTs parameters, once awhile, I've started noticing that the old i5 CPU isn't keeping up with the processing needs and this shows up as glitches in the data such as when running multichannel REW "stepped sine" captures. Obviously, this will not do. ;-)

To remedy the situation, I got one of these Beelink SER4 Ryzen 7 4700U-based MiniPCs (8-core, 8-threads, currently less than US$450 for the 16GB RAM/512GB M.2 SSD model). There is also a more expensive SER4 with faster 4800U processor (8-core, 16-threads) if you need that extra speed.

This machine was purchased from standard retail channels; this review was not sponsored in any way.

Friday, 1 July 2022

Hi-Res THD(+N) vs. Output Level Measurements (ESS "HyperStream" vs. AKM vs. TI/Burr-Brown). And a bonus R-2R!

Notice last time as I ended off the post, I showed what I think is an interesting "high resolution" graph of THD(+N) vs. Output Level for the Topping D10 Balanced which uses the ESS ES9038Q2M chip. This was spurred on after some discussions on glitches and anomalies one might see due to the "HyperStream" architecture of the ESS chip.

These days, other than the occasional fully multibit or discrete R-2R DACs, the vast majority of what we're using are multibit/multilevel sigma-delta devices. This includes the brands I have listed in the upper graphic; Asahi Kasei Microdevices (AKM), ESS Technology, and Burr-Brown (which was acquired by Texas Instruments in 2000). We'll also talk about the Philips later. ;-)

Today, let's have a look at "high res" THD(+N) vs. Output graphs (XLR output where possible to keep noise as low as possible) comparing different DACs from these companies...