Saturday, 19 October 2019

Gone Building... Linear Audio Autoranger MK II.

Linear Audio Autoranger Mk II "quarter kit". Attenuator board (yellow-gold), Control/Display board (green-blue), SilentSwitcher power supply board, metal case, USB-A connector, and programmed microcontroller in the anti-static bag.
Hey guys, during the summer, I got the above kit from Jan Didden at Linear Audio. As you can see on the front, this is the Linear Audio "Autoranging Attenuator" - also known as the "Autoranger", standard 10kΩ version.

Saturday, 12 October 2019

2019 Update: Basic Acourate DSP Room Correction (using Dayton Audio EMM-6 mic, and other related bits...)


As I mentioned last time, I changed the tweeter in one of my speakers resulting in a significant adjustment to the frequency response in the 2-5kHz range. This means it's time to update my AudioVero ((acourate)) (current version 1.9.12, 286€) room correction filters for late 2019. Looking back, I haven't posted on this since 2016! My, how time flies.

Given that it has been awhile, picking up Acourate again for some measurements required that I dig out my old notes and review the previous procedures again. As such I figured that it was time to write an update for a reasonably "quick and dirty" measurement which basically took me an afternoon to perform with excellent results. If you've tried Acourate, you'll know that this program is very powerful but can take a bit of time to figure out the interface and get comfortable with the process.

Okay then, let's get going with a quick but detailed summary while it's fresh in my mind and provide some pointers the next time I might have to do this again maybe in a few years :-). We'll then end this post with a few other related subtopics that came out during the measurements...

Monday, 7 October 2019

Paradigm Signature S8 v.3 Tweeter Replacement. A word about importance of speakers (+ rooms). (And a link to a HDMI cable blind test.)

Paradigm Reference Signature S8 v.3 tweeters.
I mentioned in late August with my "Speaker Impedance - Part 2" post that I noticed a variance between the right and left speaker impedance from my Paradigm Signature S8 v.3 that I was going to track down.


While an ohm here and there might look innocuous on the impedance curves, sometimes this could be indicative of a significant imbalance between speakers. Since I'm a bit obsessive about these things, let's get down to the "nuts and bolts" of the speaker and have a closer listen and look at the frequency response in that frequency region...

Saturday, 28 September 2019

MUSINGS: "Democratization", "Doublethink", MQA, and the Audiophile. Becoming "Post Hi-Res Audio". And some issues with vinyl...

“Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them.” 
“Freedom is the freedom to say that two plus two make four. If that is granted, all else follows." 
“For, after all, how do we know that two and two make four? Or that the force of gravity works? Or that the past is unchangeable? If both the past and the external world exist only in the mind, and if the mind itself is controllable – what then?” 
"In the end the Party would announce that two and two made five, and you would have to believe it. It was inevitable that they should make that claim sooner or later: the logic of their position demanded it. Not merely the validity of experience, but the very existence of external reality was tacitly denied by their philosophy."
--- George Orwell, selections from 1984 (1949)
It's sad sometimes reading how some (many?) in the audiophile press present products to consumers. Apparently, they'll stop at nothing to push a product even to the point of destroying their own credibility. It was bad enough a few years ago in 2017 when Robert Harley called for a "revolution" and that MQA represented a "paradigm shift"; making a mockery of the idea of paradigm shifts. And now recently he's "doubling down" to bring disservice to the idea of "democratization", linking it with the likes of MQA, in the article "From The Editor: Hi-Res Democratization" (The Absolute Sound, online September 6, 2019). Specifically, he seems to believe that those who oppose MQA is somehow fighting against the democratization of high-resolution audio for audiophiles! Really?

Saturday, 21 September 2019

Upgrade to AMD Ryzen 9 3900X Workstation Computer. (And Amazon Music HD/UHD opens to lossless and "hi-res".)

Being post-RMAF 2019 with all that talk in the last week or two with "high end" audio stuff, I figure I'll switch gears a little and take a look at computer tech instead.

One of the least enjoyable things I do every few years is to update the machines I use for work and the various ones I have here at home. While I don't enjoy the basic IT stuff and all the software installations that typically come with new computer builds, it's a good way to get updated on the machines out there, practice reasonable parts selection, and appreciate the price of the technology. Back in 2017, I updated my workstation here at home to an AMD Ryzen 7 1700 CPU which still is a very impressive processor for general use. But time marches on and my office workstation is really itching for an upgrade which hasn't happened since around 2014 and feels even slower than my laptop.

The idea then is to transition the Ryzen 7 over to the office and let's build an even more powerful workstation here at home where I do most of my writings and media encoding. Furthermore, let's try out one of the newer generation M.2 SSD drives that promise even higher transfer speed...

So, the result of a bit of online shopping:


Parts:
AMD Ryzen 9 3900X 12-core CPU (MSRP US$500, current scarcity higher price)
MSI X570-A Pro motherboard  (~US$150)
EVGA Supernova 750 G3 80+ Gold 750W power supply  (~US$130)
Corsair LPX 32GB (2x16GB) 3200MHz DDR4 RAM (~US$160)
ADATA XPG SX8200 Pro 1TB M.2 Solid State Drive (~US$150)
Corsair Carbide 100R Silent mid-tower case (~US$70)

Saturday, 14 September 2019

MUSINGS: Rocky Mountain Audio Fest 2019 - Reflections...

Assorted RMAF 2019 items... Dr. AIX book, demo disks. Collectable MQA brochure and the beautiful 135-page Wilson Audio catalogue! :-) In retrospect, should have also grabbed a T-shirt.
Beyond memories and photos - many of which already shared on Day 1, 2, and 3, the picture above are a few items I've kept from RMAF 2019 now that I'm back home in Vancouver. Each room that one goes into, one can pick up all kinds of interesting pamphlets, specifications sheets, colorful brochures. Most of these I have discarded as these days almost everything can be readily found online and in updated form.

Tuesday, 10 September 2019

RMAF 2019 Day 3...


As it has been said, Day 3 of audio shows tend to be a quieter day. It was no exception this year at RMAF. The picture above is from the "Headspace" ballroom down one of the lines of booths where headphone-related vendors display products and demo for the visitors. This picture was taken around 10:30 in the morning shortly after opening at 10:00. While number ebbed and flowed through the day, it wasn't difficult to find plenty of headphones to try and devices to play with as I wandered in and out through the day.

Since I did indeed start my day in the "Headspace" exhibits, let's start there and listen to a few interesting products...

Sunday, 8 September 2019

RMAF 2019 Day 2...

Alright guys and gals, let's continue with the sights and sonic impressions from Day 2 of RMAF 2019!

Here's a picture of Colorado Ballroom C where the seminars are presented. Bob Hodas was presenting on room acoustics this afternoon and I suspect this is one of the best attended sessions:


I was able to catch most of the presentation. There were a few useful tidbits I suppose, and I imagine it will be up on YouTube for all to see at some point. Hope he would have been a bit more concrete with the equipment he uses and provided more basic discussion on what he's looking for from the measurements he does.

Saturday, 7 September 2019

RMAF 2019 Day 1...

I must say that Colorado has some really pretty skies and lovely interplay of clouds and rays of sunlight...
Well, Day 1 of RMAF 2019 is done. Time to take a few moments to think about and review some of what was heard and seen.

The show started I believe around 10:00AM. It'll be interesting to see how the attendance numbers turns out but when I arrived around 9:30 to register, the line-up was rather long already - a good sign I hope for the organizers and exhibitors.

Thursday, 5 September 2019

Greetings from Rocky Mountain Audio Fest (RMAF) 2019...


It has been awhile since I've been at an audio show! Until now I've never really bothered to leave the comforts of home to attend any of these events unless they showed up locally... And a few years ago, VAS 2015 and then VAS 2016 happened which allowed me to get a taste of what these shows had to offer.

Saturday, 31 August 2019

MEASUREMENTS: Speaker Impedance - Part 2; sealed, ported, and a few of my speakers...


A couple weeks back, I started discussing speaker impedance curves and how one as an audiophile hobbyist might want to measure these ourselves. There are thousands of speaker models out there and while some in the audiophile press do a good job with providing objective results (like Stereophile), sadly, most magazines do not publish the information, and most manufacturers do not openly provide detailed specifications either. What else then can one do but measure it ourselves?!

Today, let's continue to explore the speaker impedance measurement graphs and see what else they can tell us using some of the speakers I use at home regularly...

Saturday, 17 August 2019

MUSINGS / DEMO: Why "Bits Are Bits". Let's not add unnecessary fear, uncertainty, and doubt.


Something I have noticed over the years commenting on the audiophile hobby has been how incessant and persistent various themes tend to be. Just like the apparently never-ending arguments of "digital vs. analogue/vinyl", or "CD vs. hi-res", or "subjective vs. objective", there has been this mostly friendly banter between those who feel that essentially "bits are bits" vs. those who think there is significantly more to digital transmission than bit-accuracy.

Seeing recently this article "Why the 'Bits is Bits' Argument Utterly Misses the Point" from Upscale Audio published compelled me to write this post to explore the topic further with a review of measurements and some demo tracks for readers to listen to themselves. I don't know how long the Upscale article has been on the site since there's no date or author listed, and was only made aware of it through the Darko.Audio Facebook page (it seems Mr. Darko felt the article was accurate, really?).

While the article claims that some people have "missed the point", let us examine their points and see if perhaps it might be the author(s) that are a bit too aggressive in making these arguments. After all, it is 2019 with decades of development in digital technology that impact our lives in more sophisticated ways than just audio reproduction. It's hard to imagine there are huge lacunae in our knowledge of digital communications and digital-to-analogue conversion of audio frequencies.