Do HDMI cables make a difference for IIS/I2S/I²S-HDMI audiophile DACs?

It's taking a bit longer for my testing of the inexpensive I²S/IIS/I2S-HDMI DDC boxes due to some unexpected results which I'm chasing down currently; hopefully that gets resolved or understood soon.

In the meantime, let me address something that folks might be curious about related to this topic of the I2S-HDMI interface... Does the HDMI cable make a difference to the sound quality?

As with much of audiophilia wherein some members of the culture have the belief that "everything makes a difference", obviously this is not the case and I do not recommend this kind of mindset. There are many things that don't make much, if any difference (as discussed here and here) based on experience and understanding principles of the technology.

Since I have not seen measurements examining the effect of HDMI cables on I²S performance from a DAC, let's do some testing here.

Visit to a "more subjective" leaning friend. And something like Synergistic Research "Transducers" (HFT, GCT, ECT...) to try.

Hey everyone. I'm still waiting to finish the measurements and write-up of the USB DDC boxes discussed last time (a few things I need to double check on!). In the meantime, I thought I'd share some thoughts and pictures with you of a visit I made to a friend, Paul's, place. You'll see that he is much more of a "subjectivist" than I am.

Above, we see his listening room which is capable of multichannel playback as well for music and movies. He's a multichannel enthusiast who values the immersive experience and has a large library of surround content in PCM and DSD - great to see!

Clearly, Paul is a Linn fan with almost an all-Linn system. He has front Linn Akubarik Exakt (Katalyst) active speakers, an Akurate 225 center channel, and a pair of Akudoriks as rear/side channels. Over the years, he has been experimenting with Linn Space Optimisation and wrote an article about his experiences (he contacted me after he saw my tests with Linn SO last year).

Inexpensive USB2.0 Digital-to-Digital Converters (DDC) Pt.1: Douk Audio U2 PRO (Upgrade Version) and SMSL PO100 PRO - initial look, about I²S-HDMI. In praise of unofficial Atmos mixes!

This SMSL unit also does MQA decoding for those who want the feature. Unlike the Douk, this box only has an LED to indicate MQA decoding status but does not tell us the PCM or DSD samplerate.

While I've tested some inexpensive devices (like the Topping D10s DAC) which have the ability to convert USB 2.0 input into S/PDIF output, I have not specifically looked into these Digital-to-Digital Converter boxes which some audiophile reviewers (like this fellow, and this) seem to rave about.

For me, there just hasn't been any reason to be particularly interested since other than conversion from one interface type to another, the other promise of such devices - the reclocking capability - just hasn't been of great interest to me. As far as I can tell from listening, it's not like jitter has ever really been much of an issue unless severely bad for any decent modern device I've ever come across even at low price points (nor was jitter really an issue even with old CD players)!

However, since I have not tested I²S/I2S/IIS, I figure I'd buy both the Douk Audio U2 PRO 2025 upgrade version (US$63; Amazon Canada) and SMSL PO100 PRO (US$74; Amazon Canada) boxes to try out; have a listen and run some measurements. Unfortunately due to time limits, I'm not quite ready to show the measurements yet, so keep an eye out for those results, perhaps next week! For now let's just introduce you to these devices and talk about the I²S-HDMI connection.

As typical of the majority of my reviews/critiques, I bought these through retail channels.

Images from San Francisco: Audio Vision SF, B&O Flagship Store, Amoeba Music. Question of greater importance: music or gear?

It's an interesting experience I think to pop into local "brick and mortar" audiophile stores when traveling (like this, this, this over the years). This past week, I've been in San Francisco visiting family. We happened to stay within walking distance from what I think is the most well-stocked audiophile gear store in the city - Audio Vision San Francisco - located in the Nob Hill neighborhood. They're opened on weekends, closed on Tuesday, and by appointment on Mondays.

Chatting with the salesperson, I was told the store opened about 26 years ago. I suspect most audiophiles will be impressed when you walk into the store and see their selection of gear sitting in the hallway!

More Audio Potpourri: What's the best sample rate converter? The other father of MP3 (James D. Johnston "JJ"). Are measurements important? And TAS' "objective" confusion.

For this post, let's discuss a few other audiophile items that have come my way in recent weeks.

First, let's talk about something I haven't brought up for awhile now: sample rate conversion (SRC).

A few weeks ago, Spoon (a.k.a. Steven Elkins of Illustrate) sent me an E-mail about his new src.hydrogenaudio.org page evaluating and ranking the qualities of various software sample rate converters. I believe the page has been online since late 2025. Check out the forum discussion about the project as well.

Audiophile Potpourri: December 2025 web traffic among audio sites, price of cables poll, and flashback 2014 while looking ahead.

Let's have some fun this week on miscellaneous topics.

Occasionally, I'll highlight items I've either written or found on audio discussion forums I think would be good to share. One reason I decided to start doing a blog beyond just contributing to forum discussions was precisely because while the public forums are great for interactions with community members, meaningful posts often become obscured behind pages and pages of chit chat, irrelevant responses, and sometimes unpleasant arguments.

[I've unfortunately witnessed situations where very meaningful threads are closed off prematurely based on the bias of moderators. Even worse, threads with useful discussions might be erased entirely from existence which I feel is an slap in the face of well-meaning participants who put their time and efforts into thoughtful reflections. This is nothing new in the audiophile world; for example last year Stereophile scrubbed their website of all public comments accumulated over decades!

While I acknowledge the right of a website's owner to do such things, that doesn't make it any more palatable. I certainly understand the need for moderation in removing nonsensical, trollish, unethical, or crude statements that add nothing to promote thoughtful discussions.]

Speaking of forums and websites, I thought here in early 2026 it would be fun to explore website traffic numbers of some of the most common audiophile/audio sites using a common metric. One can get monthly visit numbers from Similarweb for free, a well-known website traffic tracker.

miniDSP UMIK-2 USB Microphone: analog gain & optimizing self-noise. Plus audiophile gear pictures from "No Other Choice".

Last week, I discussed the miniDSP UMIK-2 USB measurement microphone and as I mentioned then, it's not often that we see much discussion about these devices among audiophiles even though they are important in helping us chase down sonic problems and of course to calibrate the sound system. To me, that calibration process is an essential part of achieving a truly "accurate" sound system once we sort out basic room set-up; assuming high-fidelity accuracy is what you're after of course!

So, before heading off to other topics, I thought I'd explore a little more about this device.

miniDSP UMIK-2 USB measurement microphone (also ambient noise floor, measurements of my system using Dirac Live with Paradigm + SVS subs)

Well, as mentioned previously, it was a great holiday season and here's another gift from Audio-Santa 🙂 - the miniDSP UMIK-2 measurement microphone. I bought this through Solen.ca here in Canada and they did a great job with the order and quick shipment. Amazon Canada often has limited stock of miniDSP products.

I'm sure the miniDSP company is well known to many audiophiles at this point. I bet many of you, like myself, already have one of their UMIK-1 microphones which I've used in a number of the acoustic measurements on this blog since 2019.

As you can imagine, the UMIK-2, initially released in late 2020, is an evolution of the UMIK-1 with upgrades which we'll talk about. First, let's have a peek at the physical device itself.

More Bass: The SVS SB-2000 Pro subwoofer (sealed, 12", 550W, DSP, Bluetooth)

Over the holidays, Santa brought me a new SVS SB-2000 Pro subwoofer (currently US$900 black ash, US$1000 piano black, Canada: black ash, piano black) for the system in the sound room. As you can see, I got the slightly more expensive shiny piano black version. As usual, I bought this from typical consumer channels.

On this blog, we've talked about full-range sound, including the importance of subwoofer(s) in order to experience "fully" all there is in our recordings. As a pop, rock, electronica, orchestral, movie-lover, the ability to experience down to 20Hz (even a little lower into "infrasound") with adequate power, and low distortion is all part of what it means to achieve "high-fidelity" audio that is transparent to the source recording. As usual, it doesn't mean I can't enjoy my music without these sub-bass frequencies! It's just nice to know that I'm not neglecting content present in those lower registers as provided by artists and audio engineers.

During the pandemic, in the spring of 2020, I bought myself an inexpensive 8" Polk PSW111 to use as an "accessory" subwoofer to help fill-in the bass response in concert with the mighty Paradigm SUB1 (1700Wrms, 6 x 8" drivers), my main subwoofer that achieves frequency response down below 20Hz. For these last 5+ years, the little Polk has done its job reasonably well but it clearly has limits. For example, when pushed up in level, I can hear the "chuffing" from the small ~4" diameter down-facing port. Also, a ported 8" sub like this can really only be expected to reproduce down to the mid-30Hz at best.

And so, moving ahead, let's spend some money to retire that little Polk sub to my main floor living room, making space for this SVS! 😁

Happy New Year! And a thank you to the Lyrion Music Server folks for renewing the life of my Squeezebox Radio. ☺️

Hope you're all having a wonderful Christmas-New Year Holiday season!

On Christmas morn 2025, as I relaxed in the sitting room waiting for the rest of the family to get ready for some holiday festivities, listening to holiday music, I could not help but marvel at the fact that my little Logitech Squeezebox Radio sitting over the fireplace, released back in 2009 continues to go strong all these years later. The Squeezebox products including the Radio were some of the first devices I posted about with measurements in the early days of this blog.

I think it's an obvious reminder that even though time flies, music preferences and artists change, hardware gets upgraded and new technologies show up at our homes, the ability to enjoy music need not be tied into the hardware obsessionality that can consume audiophiles. We can derive much joy out of even a simple mono "radio" device like this.

Although Logitech got out of Squeezebox hardware production way back in 2012, they continued the official MySqueezebox.com servers until March 2024. I actually didn't even notice this change as I've been using my own Logitech Music Server (LMS) home system since something like 2008.

While LMS development has stopped, it's great to see that the good folks have continued to work on this venerable music streaming system as Lyrion Music Server.

On the Danny Richie / GR-Research's UberBUSS hypocritical video against Amir / Audio Science Review.

After writing the article recently about New Record Day's "AI assisted research" on the P.I. Audio / GR-Research UberBUSS, I thought it was disturbing seeing this recent, rather juvenile, video from Danny:

As we can see, there is this ongoing conflict between Danny and Amir/Audio Science Review (ASR) over the years. Obviously, ASR has been highly critical of some GR-Research products like their power cable and speaker designs. I think that's to be expected; since when did objective-leaning audiophiles care for US$400+ power cables? Objective reviews naturally compare metrics and seek out good value so high-priced items that cannot show improvements in the measurements (nor with controlled listening) simply cannot be recommended.

Given that Danny made this video voluntarily, released publicly, I assume he wanted to foster discussion, so let's get into this for a bit.

First, consider the title - "Measurements vs Listening — and the History of a Site with an Agenda". Sure, Audio Science Review has an agenda and it's different from Danny's. There's nothing wrong with that and in fact is to be expected for anyone trying to publicly make a point to influence others! I'd be dishonest if I claim to have no agenda either given the kinds of articles I write in these pages. Here are some of the items on my agenda list:

A. To discuss audiophile topics through a "more objective", rational lens.

B. When I review stuff, to aim to show demonstrable effects (measurements, graphs, etc.).

C. To speak clearly when products appear to be Snake Oil.

I trust that none of those 3 points above would be a surprise to anyone who has read an article or two around here.

Douk Audio VU3 Pro Analog VU Meter - more bling! (Make sure to try some harder music at audio shows! 😉)

Hey there guys and gals, since I've been in the mood for bling this end-of-year season (as per recent discussion of the Fosi Audio LC30), let's grab another one of these VU meter boxes - as you can see above, it's the Douk Audio VU30 Pro (typically around US$150, Canada link, AliExpress), a 2024 upgraded version of the Douk Audio VU3 (non-Pro) which came out back in 2021.

Similar to the Fosi LC30, this is also an analog meter with 2-in/2-out switcher which will allow you to select one of two amplifiers and two speakers. As a "Pro" model however, this box has been upgraded with a few funky features over the first version which we'll talk about.

As usual, I bought this from standard retail channels; no contact with the manufacturer.

On using AI/ChatGPT analysis to convince consumers about audio snake oil? GR-Research UberBUSS anyone?!

These days we have AI making hit music, and AI actors coming soon. The AI industry is "hot" and impressive, seemingly the answer to all kinds of queries we may have right at our keyboards! I think it's absolutely true that with the advent of LLM's and multi-modal deep learning models, we have even more ability now to learn, analyze, and summarize all kinds of information unheard of just a few years back. Like all things, there's always a catch which is that we have to use the tools responsibly and we need to make sure not to be overly reliant on these things because the results can also easily be wrong, like the "hallucinations" (more like "confabulations") that happen still all too often during AI chats.

We're seeing the advent of AI-driven intersubjective delusions in some people. Over reliance of these information tools can lead to all kinds of unforeseen negative outcomes across different domains (like in the legal space).

So I guess it's natural then that audiophiles might want to apply the technology to answer some of audiophilia's deepest never-ending debates - the stuff at the heart of numerous snake oil products.

The other day, I ran into an interesting New Record Day / Ron Brenay video where he uses ChatGPT to assess room audio recordings either from components using stock power cables, or through a new fancy GR-Research power conditioner called the "UberBUSS Power Filtration System" starting at US$1,600 that Danny Richie obviously is getting all excited about (my goodness, everything is "another level" with this guy - how many levels are there with mature technology?). This UberBUSS is further paired with his poorly reviewed US$380-$480 B24 power cable for the test.

[I see the UberBUSS isn't a totally new power filter, non-surge suppression product. Apparently it has been out since before 2021, earliest mention 2018, made by P.I. Audio Group which I guess is now defunct? If at first you don't succeed... Keep trying?]

Let's have a look at this video and what's being done...

Fosi Audio LC30 Analog VU Meter (Black Version) - bling!

A couple of weeks back, I evaluated the Rotel RSS-900 speaker switch and in that article, I mentioned this device, the Fosi Audio LC30 VU Meter and Amp/Speaker Switcher (less than US$150 street price). Notice that I have the "Black" version (Amazon Canada link, AliExpress) which doesn't look like it's as easily available as the typical "Yellow" meter version and it also has a slightly higher MSRP at least here in Canada. I bought this one from the usual consumer channels on sale.

Let's be honest, unless we're working in the studio on a project, for playback, dancing meters are mostly about adding "bling" to the sound system and I'm totally about having fun with this! 😀 This darker "Black" color scheme in my sound room is not as bright and won't distract from watching movies. At lower brightness levels, is easy to not draw attention to itself when lights are off.

Let's talk about this box, the features, and a little about the performance.

MUSINGS: On various characters in the audiophile hobby, debates, opinions and the Hearing Test.

Hey everyone, once awhile I'll take a look at stuff YouTube offers me in the feed that might be interesting. I see that in the last few months, there has been this channel called "The HiFi Five" and in Episode 6 (November 19, 2025) they invited Dennis Burger of SoundStage! for a discussion. I found this video actually quite interesting as an illustration of objective/subjective mindsets, biases, and the personality styles that come through in communicating such ideas.

Check this out if you have time for a deeper dive with discussion to follow, related to the contents and characters: