Saturday 2 March 2024

Home Audio Fidelity's (HAF) X-talk Shaper DSP. And is crosstalk correction/cancellation (XTC) just an "effect"?

See video and plug-in info at Home Audio Fidelity site.

Let's spend some time talking about X-talk Shaper in this post, a new DSP plug-in that will allow speaker system listeners enjoy crosstalk cancellation.

For those who have not read much about this, perhaps review the post from last year written with STC on crosstalk cancellation (XTC) and Ambiophonics. There's also the reposted article written by Ralph Glasgal that discusses some of the rationale for Ambiophonics you might find interesting and I hope provides good background for the 'hows' and 'whys' of this technique.

Saturday 24 February 2024

REVIEW: AGPTEK A30X Music Player - inexpensive 32GB utility DAP/MP3 Player. And a few words on EQ and some sample curves.

Open box: music player, quite comprehensive manual, USB-C to A cable, inexpensive earbuds, strap, and lanyard (can be a little tough to snake this through the hole on the bottom right, use a needle or paperclip to push/pull it through the slot!). 

I love my music, which is why I became an "audiophile". I definitely do not believe that audiophiles need to buy expensive or exotic stuff. These days, reasonable sounding products can be very inexpensive and in the service of just having music available on a bus, subway ride, maybe even in a car on a road trip, all we need I believe are "utility"-grade devices to serve that purpose! Lossless is likely unnecessary and hi-res audio would be a waste of storage space on devices like these (let's be honest, hi-res files often are just a waste of space already regardless of device quality!).

With a need for an inexpensive Digital Audio Player (DAP) a few months back, I came across the AGPTEK A30X Music Player as seen in the open box above. With a cost of only about US$30 (bought retail), this little guy features 32GB of microSD storage (expandable to 128GB), has a 2.4" touchscreen, both 3.5mm headphone out plus Bluetooth 5 wireless capability. Furthermore, this supposedly can play video, has an FM radio, can record audio, has a pedometer function, and apparently e-Book reader capability; admittedly I haven't tried all this stuff out nor would see myself using this other than the radio function. This is a self-contained device and does not have WiFi capability.

It supports a range of audio codecs including MP3, WMA, FLAC, APE, and WAV. Up to 24/48 from my testing (like Apple products as far as I'm aware).

Here at the Musings, I think it's just as important running measurements to see how well the "low-end" performs as much as "hi-res" devices! The lowest tier device tested over the years remains the sub $5 CheapDAC'22 ðŸ˜Ŋ. As usual on this blog, unless specified, this write-up is in no way sponsored by the manufacturer.

Saturday 17 February 2024

HUNSN [CWWK] RJ36 Fanless MiniPC: Intel i3-N305. Power-limiting, setup, Roon outputs - multichannel, crosstalk cancellation DSP, direct USB.

Okay, let's continue with our exploration of the fanless HUNSN/CWWK i3-N305 computer discussed last week. This time, we'll focus on what I did here to get it running as my music end-point (for Roon), in particular creating multiple output options for multichannel, stereo crosstalk cancellation (XTC) DSP, and also for those times when I want the highest 2-channel resolution playback to the USB DAC.

Most of the time this computer will be running "headless" although it is connected to my TV and I will on occasion watch movies using Kodi. And since the machine is quite powerful (>100GFLOPS on Linpack stock), I turned down the power utilization for my purposes which in turn will keep the fanless solution cooler.

Let's get going!

Saturday 10 February 2024

REVIEW: HUNSN [CWWK] RJ36 Fanless MiniPC - Intel i3-N305 (12th Gen "Alder Lake-N", 8C/8T, 32EU iGPU). And comparison with the Raspberry Pi 5.

Another year, another upgrade to the sound room MiniPC! 😁 Honestly, for audio streaming purposes, I could easily just use the very low power MeLE Quieter2Q as a Roon endpoint with multichannel capability discussed in 2022. As usual, "Bits Are Bits" so this upgrade is not about sound quality, just fanlessness, and higher processing speed on tap.

Recently, I saw this interesting article for an Intel i3-N305 MiniPC and thought it might be fun to try a fanless low-power but reasonably fast machine. The i3-N305 CPU consists of 8 Intel 10nm 12th Generation Efficient-cores (E-cores) with a 32 Execution Units (EU) iGPU; significantly faster than the last miniPC I reviewed which was the Beelink EQ12 with Intel N100 CPU - 4-core, 24EU.

So to give this a try, I bought the HUNSN RJ36 off Amazon, standard retail "barebones" unit since I figure I could buy the DDR5 RAM and M.2 SSD drive myself. Current price about US$375 before RAM and SSD.

The OEM company who makes these computers is CWWK. Similar computers can be found with the Topton brand name. There's no logo or name on the box itself which to me is fine - brand names are not important to me for many tech products so long as performance, build quality and reliability (which can only be determined over time) are adequate.

Sunday 4 February 2024

Computer Parts: Marvell AQC113C 10GbE network card (QFly NIC-10G), PCIe x4 riser, and 7-port USB3 PCIe x1 Card.

Over the years, I've written about transitioning to faster ethernet here at home with standard copper 10GBASE-T (10GbE) cabling, beginning back in 2018. This works fine even with Cat-5e in the walls of my home (although some renovations use Cat-6). More recently, my home network was upgraded to 2.5GbE for any device that can benefit, with standard 1 gigabit/s fallback.

Last month, I needed another 10GbE network interface card (NIC) and noticed that we're now seeing inexpensive Marvell mGig AQC113C NICs available, upgrades from the AQC107 cards I have been using. So I grabbed a QFly NIC-10G (~US$75) to try out. There are other similar products like the NICGIGA (very unfortunate name).

The card offers 10G/5G/2.5/1GbE speeds and below (100/10Mbps) for compatibility. The new chip operates at only 4W running 10G speed (I believe the AQC107 is estimated at ~6W) making it even cooler-running for heavy loads.

Saturday 27 January 2024

Cautionary Tale: Audiophile's dream's end... Make sure to find balance, audiophiles.

 I remember a couple of years ago, I saw this YouTube documentary on Ken Fritz:

That is certainly an impressive demonstration of dedication and passion poured into the sound room and audio system! Few would have such tenacity, disposable financial resources, or apparent family support. Admittedly, I wondered while watching that video just how well those massive DIY speakers integrated into the room and what measurements would have told us about frequency response and time-domain performance. There's a low resolution frequency response graph here. Yeah, I'm sure the system could play loud with 35,000W* of amplification.

And 2 years later, sadly, the final chapter of the life story was published a few weeks back:

I guess we'll never know exactly how that system sounded like now that everything has been taken apart. What looks like 27 years of labor and $1M original price was dismantled and sold off for $157k total in a comparatively short time. Clearly, neither the family nor the new home buyers had need for the extravagant system in the large room. The dead might at best influence, but cannot declare the will of the living.

Here's a detailed description and list of components. Obviously, audio/music items are generally not investment vehicles unless it's attached to someone very special (like maybe say Hendrix's guitar amp). These things we talk about are for the consumption of music primarily. The non-investable nature of these products is especially true of DIY items given that the quality of such items are unknown even if the bits and pieces like speaker drivers could be from a reputable brand. Over time as components degrade, it could be difficult performing repairs on non-standard builds.

Saturday 20 January 2024

On Stereophile's "Dolby Atmos: A Bleak Shadow?" - really? ðŸĪ”

I saw Stereophile's "Dolby Atmos: a Bleak Shadow?" article the other day. Honestly, I found it a bit irritating. The ideas seemed poorly contextualized with little background or meaning for what I imagine would be the average audiophile reader. It basically consisted of hearsay-level cherry-picked concerns as if these are significant (including that title).

Let's be clear about this. It's not like any of us must or even should love Atmos or multichannel. We can easily get through a lifetime of music enjoyment with 2-channels. Even though I like and even prefer multichannel/Atmos for many of my albums, it's just an option for those like myself who want to explore the surround-sound music experience as a superset of modern audio reproduction technology. Some artists and audio engineers these days are also exploring the extensive flexibility and ways to best create the mix. So if a traditional audiophile magazine believes that staying at 2-channels is all that's needed, well that's fine. But one doesn't have to write articles that seem to be trying to induce some kind of emotional response, stirring intrigue or concern even in just that title. (These days, sound bites and headline titles might be all that many pay attention to.)

So what do you mean by "bleak shadow", Mr. Lindberg (as reported by Jim Austin)? Are we talking just about numbers like bitrate going down when a lossy stream is delivered to the consumer, or are we implying that sound quality changed significantly in a negative, "bleak", way? If it's only bitrate reduction, that's totally fine, isn't it? Since the consumer isn't keeping the data, there's no point wasting network bandwidth! Streaming services like Netflix or Disney+ all stream lossy video and audio. Many customers, I'm sure including discerning ones, will not complain if they understand the nature of the technology and the quality limits depending on how it's consumed.

Saturday 13 January 2024

MUSINGS: On YouTube listening tests and the sound of "high-end" vinyl vs. streamed digital playback.

The Internet is wonderful, isn't it?!

In the span of a few decades, we can all make our presence known to the far corners of the world and express (almost) anything we want whether it's sharing what we had for lunch, whether we're "available", our political/moral/ethical affiliations, or even esoteric blog topics. ðŸĪŠ

Even better, we can project sounds and videos on YouTube and the like, opening up the opportunity to reach others though a modern "boob tube" where instead of the TV station programmer telling us what to watch next, good-ol' YouTube algorithms choose what we might desire from tracked search preferences. Amazing, if not also creepy...

Of course, if we have an entrepreneurial spirit, one could receive great rewards. Monetization potential can be impressive as witnessed by some of the elaborate content on YouTube channels! That's great so long as we're seeing knowledgeable, verifiable content presented in fair ways that can help teach and promote understanding. Not so great when information is perpetuating falsehoods, potentially destructive conspiracies and propaganda.

For this post, let's talk about something we've seen presented over the years on a number of audio channels. There is at least an implied idea out there, thanks to YouTube, we can now "hear" the sound quality of an audiophile system. Furthermore, that we can make comparisons of the sound quality. Is this true?

Saturday 6 January 2024

MUSINGS: Fidelity, Immersion, and Realism (FIR) - Levels of Audiophile Attainment

As we start 2024, let's think about a "big picture" topic. Like with most things in life, I find it useful to think about the overarching philosophy - the "forest" if you will - alongside the details - the "trees" - which is when we get down to measurements and tests of specific products. Hopefully by doing this we can develop a more comprehensive understanding of whatever it might be we're engaged in.

As discussed years ago, I don't think the audiophile hobby is a monolithic entity based on only one core pursuit. In reality, it's a multitude of hobbyist pursuits ranging from the "music lover", to the "hardware audiophile", to subgroups like the "gear hoarder", "LP collector", even "high end (luxury) enthusiast", each of us at varying levels of emotional intensity; even resulting in more "fetishistic" extremes! ðŸ™„

We're not a particularly large group of hobbyists. Sure, there are billions of music lovers out there, but when it comes to guys (mostly) wanting to talk about audiophile hardware, geeky high-fidelity (transparency) reproduction, and things that appear extravagant to the general public, there really are not many of us. It's also hard to know if this hobby is growing, stagnant or diminishing in numbers.

As I look around at magazine reviews and YouTube videos, that idea of stagnation has entered my mind many times over the last few years. Not just wondering about the numbers of audiophiles and whether the hobby is growing, but rather, in what directions are we as hobbyists going forward, if even at all!

Approaching the mid-2020's, are we still in search of "High Fidelity" after all these decades and the multitudes of products? Maybe, maybe not... Let's talk about some ideas which I believe are the goals that audiophiles can aspire to which I've acronymized as FIR - Fidelity, Immersion, and Realism.

Sunday 31 December 2023

Archimago's Musings: Terms & Conditions, Privacy Policy

Sites need to comply with General Data Protection and Regulation (GPDR) policies if there are visitors from the EU, so for transparency, here are some broad Terms and Conditions as well as Privacy Policy statements for this blog as we enter 2024.

Basically this: I trust we're here to learn, enjoy the hobby, debate sometimes, as generally anonymous participants, acting like decent persons online. The purpose here is not to sell stuff or make money even though I don't mind getting a little "tip" if folks buy stuff for example off Amazon links or if the ads work out for you. I have no interest in soliciting funding from anyone such as with Patreon and the like; my day job pays just fine.

Be mindful that public comments are public so don't say anything private unless you want it known broadly. No doubt in the days ahead there will be all kinds of bots and increasingly sophisticated autonomous agents reviewing the information and scraping the data. Consider how this might have an impact on you and the comments made.

Cookies and IP addresses are sent to browsers routinely so feel free to decline sharing cookies, use "incognito" browser mode, perhaps connect through a VPN if you don't want to be tracked especially on a public network (here's one I use). Google Analytics, AdSense, maybe a widget on the blog might use some of the cookie or IP info.

If you're responding to one of my surveys, blind tests, or contacting me by E-mail, unless you choose to do so, I will not have any need for your private information unless we get to know each other or plan to meet up, etc.

Otherwise, Happy 2024! May your life be free from scammers, spammers, identity hackers, snake-oil salesmen, and general crooks in the coming years! Peace.😌

Thursday 21 December 2023

Merry Christmas & Happy 2024! A year in review, final MQA sales, and have a very Spatial Christmas. 🎅

Hey everyone, I want to post a holiday greeting and retrospective as we end off 2023 and as I wander off for some R&R down south. This has been an interesting year I think in the world of audio. In my journeys through audiophilia, it's the year I'll remember as one of continued evolution in the fidelity of various components and further maturation of technologies available to consumers at very reasonable prices - specifically amplifiers.

2023 also marks the point of crossing 10M hits to this blog according to Google's analytics which is I think a significant numerical milestone. Not bad I think given my pace of sub-weekly posts, dealing primarily with topics that attract a relatively small group of hobbyists. While some of these technically-oriented articles probably are a bit beyond the interest of many audiophiles, I do hope that in time, the "average" hobbyist will see them as presenting some foundational knowledge that we should all know about the technologies we buy, and expressing a worldview that those who assess the audiophile hobby more objectively would tend to focus on.

Let's have a little recap of some articles and ideas shared over the last 12 months...

Saturday 9 December 2023

MUSINGS: On the duplicity of hi-fi audio anti-measurers? The John DeVore example.

The Hall of Measurement Devices.
"When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind: it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be." --- Lord Kelvin, Popular Lectures and Addresses vol. 1 (1889) ‘Electrical Units of Measurement’, delivered 3 May 1883

"What is measured, improves." --- Peter Drucker (from The Effective Executive) 
"When performance is measured, performance improves. When performance is measured and reported back, the rate of improvement accelerates." --- Karl Pearson

A longstanding debate over the years in the audiophile pursuit sadly is that of whether measurements are important in audio. Obviously, to me, and I think the vast majority of the world, the answer is "Of course it does!". One does not need to be a scientist of Lord Kelvin's stature or a statistician like Pearson, or a management consultant like Drucker to see the wisdom of such a basic idea which probably is one of the founding principles giving rise to our modern technologically sophisticated world.

Can you think of a single technological pursuit where the use of measurement instruments of some sort isn't beneficial to help gauge the effectiveness, efficiency, or value of a device which has been invented, produced, or manufactured? Is this not doubly important if that devices is supposedly built to a high "standard", reportedly made with quality and care? Typically at a higher cost like the things of "high end" audio?

Well, apparently, there are supposedly respected people in the audiophile world, designers even, who seem to think otherwise about the importance of measurements...

Saturday 2 December 2023

Do bit-perfect digital sources affect a USB DAC's sound quality? [2023 Edition - phone, Raspberry Pi, MiniPC, laptop]

In the image above, we see embedded some pictures of contemporary, expensive (>US$10k) digital audio devices. Each one of these are just streaming or server boxes that can take data over your network or internal storage and pass them along to a DAC with no actual conversion. Typically, these "high end" audiophile products (for example some featured here) are not asked to perform DSP, thus passing the data in a "bit-perfect" fashion. Furthermore, these expensive devices do not include an internal CD/DVD/SACD/BluRay mechanical reader. They're basically computers with hard drives or SSD storage and software to index and manage your music library. You'll typically be connecting them to your favourite external DAC most popularly through USB although proprietary interfaces (eg. Wadax's optical), ethernet, S/PDIF coax/optical, and i2S could be other options.

The other day, a family member was in need of a replacement phone so I gave them my Huawei P30 Pro which I've been using since 2019 and got a Google Pixel 8 Pro. After transferring the apps and data over, I figured I'd try to see if USB Audio Player PRO on the Pixel 8 Pro would work with the very high resolution Sabaj A20d 2022 DAC (ES9038PRO converter) which the Huawei phone previously did not. It worked, reminding me that Android USB hardware and drivers can result in different levels of USB DAC compatibility.

With the phone connected to the DAC, and given that it has been awhile since I've put together a "shootout", let's see if there's any evidence now in the 2020's of potentially audible differences between source devices playing to a very high-resolution USB DAC. Not that I have a $10k streamer lying around here, but a $1000 phone could be different from a sub-$100 Raspberry Pi, right? ðŸ˜‰

Let's look at some data.

Saturday 25 November 2023

MUSINGS: Beyond "High Resolution" recordings. Into "Immersive" and "High Reality" content.

The other day, I was reading this interesting article about someone upgrading his computer gaming gear to the latest and greatest, only to find that it ultimately made no meaningful difference for today's games that he's playing. No surprise? (As discussed a couple months back, I upgraded to the nVidia RTX 4090 but not for gaming.)

As tech hobbyists, it's important not just to be aware of what we could buy, but more importantly, what is it that buying the hardware would achieve.

Human sensory systems are not infinite - whether it's the angular resolution of vision, or how many frames per second we need for gaming before it's no longer noticeable (upper limit I've seen maybe 75fps?). So too, there's only so much audio frequency bandwidth or dBs of dynamic range we need to more than saturate our auditory limits.

To me, it's not good enough to just be fed information from the usual magazines or advertisers or reviewers, it's more important to understand what it is that the technology is able to do and by doing so, we understand what we really need, and have a chance to anticipate what we might be looking for ahead instead of being unduly externally influenced.

In this spirit, let's take some time to consider the road ahead. After all these years, where is progress to come from? Let's think about this...

Saturday 18 November 2023

How-To: Resurrecting bad BIOS update with CH341 USB EEPROM Programmer (AMD AM4 motherboard, 1.8V flash example).

Let's do a quickie post this week.

As per the discussions last time, I've been doing some computer upgrades here at home and at one point a few weeks back, I was updating the BIOS on my AM4 MSI X370 SLI Plus motherboard but accidentally disrupted the power in the middle of the flash!

This basically "bricked" the machine because this particular board only has one BIOS bank and there are no facilities to reflash. Since my AMD Ryzen 7 1700 CPU is still a very reasonable 8-core processor that can still be used for many applications these days, I looked for an inexpensive way to fix this BIOS mistake. The solution is the package shown above - a CH341 24 and 25-Series EEPROM Flash Programmer (less than US$15, this item on Amazon Canada).