Rotel RSS-900 Speaker Switch.

For this post, let's spend some time looking and listening to the above device. It's the Rotel RSS-900 "speaker selector", MSRP around $200. This has been on the market for awhile now, I think released back around 2004. Here's the manual for it. I was graciously lent this box by a friend to check out as this is not a kind of product I've published on in this blog.

As you know, these days, loudspeakers tends to have quite low impedances with 4Ω ratings common and often when we look at impedance curves, it's not unusual to see values down to even below 2Ω for some frequencies (EPDR's typically even further down). Coupled with the fact that if one were to run multiple speakers to the same amplifier output, as per Ohm's law of parallel circuits, we risk extremely low impedance/resistance to the point of basically shorting out the amplifier. We obviously would not want to do this!

So it is then that we should protect the amplifier with devices like this Rotel switch if we need to run multiple speakers or for A/B listening with instantaneous switching between outputs.

We can see from the manual that this device is passive, and provides switching for one "Direct" speaker output and five switched, what I'll call "Indirect" speaker outputs. It is these 5 Indirect outputs that have "impedance compensation" and based on the manual, excess capacitance should also not be an issue.

Sony SS-CS5(M1) and Sony SS-CS5M2 bookshelf speakers - measurements, comparisons, and review.

Hey guys and gals, as shown above, I have pairs of both the Sony SS-CS5 (Mark 1) and the updated Sony SS-CS5M2 (Mark 2) bookshelf speakers here at home purchased through the usual retail outlets. As you might know from discussions online and videos on YouTube, opinions can be quite polarizing regarding these speakers. I think it's a combination of the low price (with associated biases as discussed recently) and the unusual "super-tweeter", 3-driver design. In this post, let's have a look, discuss, and go over a few measurements based on what I see and hear with these transducers.

For convenience, throughout this article, I'll often use "M1" and "M2" shorthand to refer to these Sony SS-CS5 variants.

As if higher prices always correlate to fidelity: Stereophile's Defense of Luxury Audio & the false Binding Statement of High-End Audio.

Hublot Big Bang Unico, ~US$20k+ depending on model.

Hey everyone, I just got back from the wonderful trip to Central Europe and figured I'd extend some thoughts expressed in the previous article: The Luxury of Sound and Time: Audiophile products, the Rolex and Timex Analogy.

That article went online October 12th and I was surprised to see Stereophile posted their article “In Defense of Sticker Shock” on October 17th written by Rogier van Bakel featuring a fancy looking, but inexpensive quartz wristwatch as the title image; what synchronicity! I assume his article must have been published in print/e-magazine earlier than when it showed up online.

I see the article pretty much opens with this statement:

Say “$10,000 DAC” and watch audio-forum commenters descend like pigeons on a dropped hot dog, flapping and furious.

Yeah, that's probably a fair observation! However, I think the first question we must ask ourselves is: “What’s wrong with that?”

The Luxury of Sound and Time: Audiophile products, the Rolex and Timex Analogy.

Left: This certified authentic Used Rolex Cosmograph Daytona Watch, with the Model Number: 126598TRU, has a Yellow Gold/Diamonds 40 mm Round Case with Screw Down Crown and a Gem Set. This Men's Rolex Cosmograph Daytona has an attractive Diamond Pave Dial with Gems Dial Markers. The certified Swiss tested Rolex Automatic Movement will keep perfect time for you. The elegantly designed Rolex Yellow Gold with will look great on your wrist.

Right: Timex Men's Waterbury Classic Chrono 40mm Stainless Steel Quartz Dress Watch with Leather Strap. Reviewed to be one of the best well-priced mecha-quartz watches.

If we plug in the phrase "Rolex vs. Timex" into Google, we'll see that there have been a number of articles written about this topic aimed at wristwatch hobbyists that compare and contrast things like history, the products, features, and prices (like this). For the purpose of our discussion here, the actual brands are of could not too important; these are mere archetypes - Rolex the Swiss brand that caters to the prestige luxury market, while Timex is an American company (originally started as the Waterbury Clock Company in 1854, these days American-Dutch) known to produce mass-market time pieces for the "common man"; to satisfy the needs of kids, the athlete, and yes, even dipping its toes into the luxury market though nothing like the Rolex brand price-wise. As per their classic slogan suggesting the device is meant for the conditions of daily life, the Timex - "It takes a licking, and keeps on ticking."

Over the years on this blog, I've touched on the ideas behind luxury products - here and here for example. We've also discussed the wine-tasting pursuit compared to audiophilia, but I think there is an even better analogy we can make when we look at something like the wristwatch collector (horophile) hobby. Since both audio products and watches are products of technological evolution, I believe there are similarities when it comes to the trajectory of these products, the industries behind their production, the consumers who buy them, the way they are portrayed in advertising (including in reviews) and social sentiment.

So grab a comfortable seat, maybe get a nice beverage, let's take some time to think and discuss...

Stereo Crosstalk Cancellation (XTC) / Ambiophonics: Introducing CTXMatrixBeta, a Free VST3 Plugin with XTC Calibration. [Guest post, STC.]

Greetings audiophiles!

As you may recall, Archimago and I (STC) wrote the previous article from October 2023 on stereo crosstalk cancellation (XTC). If you're not familiar with the topic, I recommend a look at that to familiarize yourself with the principles behind the technique.

I now want to introduce CTXMatrixBeta, a free 64-bit VST3 plugin that brings Ralph Glasgal's vision with freely accessible Ambiophonics for all to try. (In the near future, I'm planning to work on adding support with surround channels for the "Domestic Concert Hall" [DCH]. The ideas and logic are ready to implement.)

Regarding CTXMatrixBeta, by harnessing intuitive ear-based calibration, this plugin aims to deliver precise XTC, empowering enthusiasts to experience the immersive, lifelike sound of their 2-channel recordings with unmatched clarity.

Auro-3D "Auro-Matic": Preset and Strength settings and effects. (Brief look at Dolby Surround Upmixer and DTS Neural:X.)

A number of months back, I talked about the nVidia Shield TV Pro box and explored Auro-3D which is another technology for reproduction of immersive sound with height layers. As noted in that post, I've seen comments over time about the use of Auro-3D's "Auro-Matic" surround upmixing algorithm for music playback as being the preferred setting compared to Dolby Surround Upmixer [DSU], and DTS Neural:X being the other two common options in modern AV receivers. As a reminder, while Auro-3D could use object-oriented tools in production, it is delivered as channel-based playback rather than the hybrid channel/object systems like Dolby Atmos and DTS:X.

Having now owned my Integra DRX-8.4 for about a year and listening for myself, I concur that for 2.0 and 5.1 upmixing, I tend to prefer using Auro-Matic to expand the 3D image into the height and surround channels. For most music material, Auro's method is noticeably "fuller" in presentation without sounding harsh. It also has more options as we can see in the settings menu for Onkyo and Integra receivers that have this feature:

QUICKIES: Black aluminum alloy footers. Equipment racks. Center channel in music. Underwhelming Spotify Lossless. More Paul McGowan/PS Audio USB cable & jitter foolishness.

Hey guys and gals, not much time this week to test stuff but to start I thought I'd show some pictures of the black version of the inexpensive aluminum footers that were discussed last week.

I got these black-colored ones for my center channel, the Paradigm Signature C3 v.3 which is a 3-way, 4 speaker design that sits on my wood/glass component rack. (You can see other pictures of that component stand in my room article, or earlier when setting up the room.)

I picked the black ones since the center channel is sitting straight in front of me when watching movies, keeping it black will not add any color contrast to potentially distract from the show.

Do loudspeaker footers make a difference? Inexpensive aluminum alloy "isolation" footers.

As you can see through my posts, I'm obviously not averse to trying out "cheap audio guy/gal" products. 😏 I trust that this is completely consistent with my perspective on audio hardware for the most part being mature technologies, refined over decades already. For the high-fidelity audio reproduction pursuit, we can achieve excellent quality at very reasonable prices. Many (not all of course) of the "high-end" stuff that go for very high prices are clearly targeting a luxury crowd without necessarily achieving better fidelity. And some products, like what we'll be talking about in this post, I believe only demand "low-tech" solutions anyway.

China is the de facto consumer manufacturing powerhouse of the world in the 21st Century and we'll often find interesting and inexpensive products by mail order from places like AliExpress or Temu. Possibly worth trying some of this stuff if tariffs or shipping charges aren't too high for your country (eg. the de minimis suspension in the USA could take a big tax bite out of easy access to inexpensive goods). Technologically mature products made of standard materials at reasonable quality do not need huge price tags. For example, in early 2024, I grabbed this Nordost-like cable which worked out quite well and I believe performs equivalently in the ways that matter.

Similarly, for this post, let's look at this set of aluminum "isolation" footers which we can easily source from places like Amazon, AliExpress, and Temu:

Price: only about US$25 for a set of four as shown above - available in matte silver, black and gold. I bought two sets of the silver color for my pair of Paradigm Reference Signature S8 v.3 speakers for less than $50 total from Temu among other trinkets in that shipment. 😆

Linn's SPACE Optimisation DSP feature for their DS/DSM digital audio streamers. Does it even work?

Linn Klimax DS/2 streamer getting tested.

A couple months back while evaluating the Linn Klimax DS/DSM streamers, I mentioned that the products have the capability to implement what Linn calls "SPACE Optimisation" (Speaker Placement And Custom Environment, we'll call it SO for short); available since 2015. Because the products are network-connected, they're always online and through the Linn Account webpage, you can check the settings for your streamer and activate the SO function.

I remember being intrigued by this function and the claims of significant room-correction capability. For this post, let's take some time to explore what Linn SO features. To start, here is what their literature says about the intent of the system:

Space Optimisation is a toolset available to all Linn DS/DSM system owners which uses highly sophisticated acoustic modelling to build up a complete picture of how your speakers, their placement, and the unique characteristics of your room interact to affect the sound you hear. Space Optimisation takes account of the characteristics of your speakers, such as the position of each drive unit and the response of bass reflex ports, and of the characteristics of your room, such as room dimensions, construction materials, and features like doors and windows, to accurately model these interactions. It then precisely identifies frequencies that are artificially distorted by your environment, and reduces their energy and decay time, to reveal the music that would otherwise be hidden. It also applies a delay to each speaker to ensure the content from each speaker reaches your ears at the same time.

SUMMER MUSINGS: What could possibly be wrong with the High-End Audiophile Industry?! 🤔 (The supplier side of audiophoolery.)

Alas all good things end including summer, so this will be the last instalment to my "Summer Musings" series for the year. For completeness, since we talked about the "audiophool" consumer hobbyist last time, let's make sure to address the other side of the coin when it comes to audiophile silliness - the supplier - manufacturers, and the media that sell us stuff.

As a pre-emptive comment against sounding like a grumpy old man who doesn't want audiophiles to have fun, let me just say that this commentary is not against "having fun". If fun means enjoying your music, trying out different hardware, exploring the various sounds you can achieve at all kinds of price points, I'm totally on board with that!

However, freedom to do all kinds of things obviously doesn't imply that we shut down our brains and accept that "anything goes!". Many things can be a lot of fun at the time but not good for us, the hangover could be nasty, and regrets more common than we might want to admit. So if there's foolishness when it comes to the Industry itself, let's make sure to think about that and come to terms with it for ourselves.

In the recent post about audiophoolery, Solderdude and Mikhail wrote the following comments:

Solderdude 18 August 2025 at 23:13

I have often wondered how many snake-oil sellers actually believe in what they are selling and are equally 'misguided' by their hearing (they are human after all). Examples could be Paul McClown and Danny.

Some, for sure, are just unscrupulous money grabbers (think Machina Dynamica and absurdly priced cable sellers).

And, oh boy, most audiophools as well as audiophiles usually have plenty of money to spend on their hobby and being human and lacking actual knowledge are very easy to 'hear' things that aren't there just as they are equally fooled by optical illusions.

Some might simply have fallen for the same 'perception effects' and fully believe in what they are selling. Are these sellers also unscrupulous ?

Perhaps only the ones that sell their wares at way too high margins for what it costs to manufacture ?

Mikhail 19 August 2025 at 07:18

Should we start calling this sector of the audio industry "alternative engineering"? If there was Federal Audio Administration they would require putting labels like "Claims not verified by double blind testing" and "This product is not intended to actually improve the sound of your audio system" on their products.

Interesting points. Let's talk about this.

SUMMER MUSINGS: Who/What is an "Audiophool"? (And old quad album mixes.)

Hey guys and gals. This week, I thought it'd be fun to just talk about something that was brought up over at the Audiophile Style forums in this thread "Who or What Is An Audiophool?". Seeing that there were a number of comments already, I figured why not jump in over the past week and engage?

Doing this brought back memories of the early 2010's when I would spend more time on the forums to chat with fellow audiophiles. As you can imagine, over time with work, family life, having fewer questions to ask as I progressed through the hobby, and turning to writing articles here, my time on the forums have significantly been reduced. I'll still pop in once awhile but not like in the early 2010's to read and participate.

So this past week, as you can see from Page 6 of the thread onwards, it was fun to get back into the weeds a bit and liberally engage. Over many pages, we got into quite a few topics including ideas around blind testing, importance (or not depending on whose opinion) of objective measurements, anecdotes, human behaviors, the role reviewers play in the Industry, examples of bizarre pseudo-science, why we enjoy audio as a hobby, JG Holt's interview from 2007, personal values, anti-vaxxers, agreeing to disagree, ASR, website traffic numbers, quotes from Richard Feynman, what is knowledge, etc.

A look at the music library: How much DAC intersample overhead is enough? True Peak analysis of genres in an eclectic digital collection.

In a recent article about Linn DS streamers, I touched again on intersample peaks ("True Peaks") as I measured the DAC hardware. In the comments section, there was further talk about this topic so this got me thinking over the last few weeks to spend some more time on this but from a different angle.

For those who are not aware of what "intersample peaks" are, recall that DACs implement filters to ensure accurate reconstruction of the waveforms (unlike the jagged-looking NOS DACs which some audiophiles still subjectively appear to prefer). Typically this is done through oversampling whereby 44.1kHz (ie. CD samplerate) might be increased by something like 8x (352.8kHz) while applying a low-pass filter that cuts off content beyond the 22.05kHz Nyquist frequency. The DAC will interpolate to create those extra upsampled datapoints. In this DSP process, some of the reconstructed "intersample" points might have >0dBFS values. If these "True Peak" values are too high beyond the limits of the digital filter or output level of our DACs, the samples will "clip", resulting in extra distortion in the playback.

For this post, instead of considering from a hardware measurement viewpoint what kind of overhead a DAC can handle, let's consider from the music content side by using a relatively large music library - my library of thousands of albums - and consider just how much overhead peak we might find and "need" based on the commonly-owned music genres in an audiophile's collection.

Another Digital Volume Control Article 🙂 (Guest post by Bennet Ng)

Back in 2019 I wrote the article "Why We Should Use Software Volume Control / Management" which not only addressed about intersample overs, but also floating point induced clipping which cannot be solved by having intersample headroom in the DAC. (For a quick listening test, try the files in this thread on ASR). However it seems that some people are still not happy with the proposed solutions (e.g. ReplayGain) and resort to some other methods. For example in some of the recent blog comments someone mentioned about BitShiftGain.

Here is a snippet from the BitShiftGain website:

Digital audio is like some crystalline structure: it’s fragile, brittle, and suffers tiny fractures at the tiniest alterations. There’s almost nothing you can do in digital audio that’s not going to cause some damage. But as long as you stick to 6 dB steps and rigidly control the implementation (BitShiftGain doesn’t even store the audio in a temporary variable!), you can chip away at that least significant bit, and the whole minutes-or-hours-long crystalline structure of digital bits can remain perfectly intact above it.

Dolby Atmos Visualization: Elton John's "Rocket Man (I Think It's Going To Be A Long, Long Time)". [And Deadmau5 & The Neptunes' "Pomegranate".]

Still image from the official "Rocket Man" video.

For those who have attended multichannel demos over the years, you've probably come across Elton John's "Rocket Man" as a good track to listen to especially if it's the first time experiencing Atmos. 

[Other multichannel demo tracks you'll run into may include Pink Floyd material from Dark Side, Miles Davis' Kind Of Blue, Roger Waters' Amused To Death, Beatles Abbey Road, even Madonna's Immaculate Collection all are pretty cool.]

You might be surprised to learn that this track was remixed by Greg Penny in 2013. Recall that Atmos was first shown in theaters in 2012 with the Disney-Pixar movie Brave. So even though we typically associate multichannel audio and Atmos with movies, realize that music mixing in this format should not be seen as an after-thought that came many years later! Of course, we've had many multichannel music releases since the early 2000's on SACD and DVD-A but without the height dimension, potentially with audio objects, available now in Atmos, DTS-X, Sony 360 RealityAudio (MPEG-H 3D Audio) and Auro-3D content.

SUMMER MUSINGS: Multichannel and the audiophile - recent articles and thoughts, 2025 update.

Preamble: In this article, I'll clearly be supportive of multichannel/Atmos music playback for audiophiles. This in no way should be seen as disparaging to those who feel that 2-channel stereo is completely adequate if not optimal for their listening! Simplicity, space considerations, availability of content, budgetary factors, perceived artistic intent, subjective preferences always play into the personal choices we make.

After 25 years of collecting multichannel content since the early days of DVD(-A) and SACD, currently about 15% of the albums on my music server are 3.0+ multichannel. With hopes that this continues to grow, of course!

Every once awhile I'll look over some of the posts I've made over the years to see if there's anything substantial I might revise or provide an addendum for. Most of the time, it's just for historical review to consider my thoughts back then, but sometimes, I'm encouraged to see how nicely things have changed over the ensuing years. Such has been the case for multichannel audio, so I thought I'd make this post as a review and pointer to the topic of multichannel music as an audiophile.

The first time I wrote a post titled "multichannel and the audiophile" was back in 2019, also during the summer - "SUMMER MUSINGS: Multichannel and the audiophile. MCh streaming with a TV Box. And Thoughts on the Future..."

As you know, things have changed since then with the advent of "Spatial" streaming thanks initially to Apple Music's push into the territory, the "chicken or egg" concern I discussed around not having enough multichannel music content has been addressed very nicely. As expected in that 2019 post, streaming came in the form of lossy EAC3 compressed audio. While we didn't quite get the 1+Mbps 7.1 data rate I was thinking about, EAC3-JOC Atmos with 5.1 bed channels at 768kbps is still high bitrate for audio and an excellent-sounding standard that's hard to fault. In my own testing, this bitrate has generally been "perceptually transparent" compared to an equivalent lossless TrueHD-Atmos encode using Dolby's reference Media Encoder (recent version 3.7). I'm sure there are some edge-case killer samples where TrueHD would audibly beat EAC3 (similar to killer samples like jangling keys with higher frequency details or detailed hand claps used in lossy compression testing), but I believe differences would be hard to spot even in volume-controlled blind listening side-by-side with actual music!

Of course, if you have access to the lossless TrueHD-Atmos Blu-ray or download, go grab that over the EAC3 version as a more accurate representation of the intended Atmos presentation potentially with higher number of bed channels like 7.1. I just don't think we need to get neurotic over the high bitrate lossy vs. lossless divide.