Saturday, 27 February 2016

MEASUREMENTS: Google Chromecast Audio - Part II: Digital Output

Chromecast Audio with optical TosLink adaptor & cable.
Alright, here's the follow-up to the Part I evaluation of the Chromecast Audio. Time now to have a look at the digital output using the mini-TosLink adaptor and standard TosLink digital optical out. Please refer to the previous post since I will be using the same settings and also the Plex Media Server system to run the tests today.

The first thing that needs to be addressed is whether the Chromecast Audio is capable of "bitperfect" output. Now, I do not have an easy way to capture the digital output, but one thing I can do is to make sure that a DTS signal encoded as 16/44 FLAC can be streamed from Plex to my digital receiver without audible issues... Indeed, in this regard the Chromecast succeeded.

Sunday, 21 February 2016

MEASUREMENTS: Google Chromecast Audio - Part I: Analogue Output

So you've no doubt seen this device at the local electronics store like Best Buy. It's part of the second generation line of Chromecast devices, the Chromecast Audio released late 2015 (the other one being the HDMI video-enabled Chromecast itself). At a list price of US$35 (CAD$45), this is clearly the least expensive ways to stream audio off one's phone or other compatible network enabled server. Remember, this light, plastic puck-like device doesn't have much in the way of "intelligence" built-in which is why it needs to be connected to an actual streaming device that will basically "push" the audio data to it, either from a local server or link it with a cloud-based music source. Effectively, this is a basic "audio renderer".

Sunday, 14 February 2016

MEASUREMENTS / IMPRESSIONS: Meridian Explorer2 Analogue Output - 24/192 PCM vs. Decoded MQA.

Image from here.
Well folks, the new Meridian firmware has been released, allowing for MQA decoding. And thanks to a friend who has an Explorer2 with the recent update, he was able to record the analogue output of the DAC playing a standard 24/192 PCM track and the same song as a decoded MQA (24/44)! This is the obvious next step in evaluating MQA after my previous post listening to and evaluating the undecoded MQA file.

The song selected for testing/listening was from 2L (of course) - the track "Blågutten" from the Hoff Ensemble's album Quiet Winter Nights (2011, MQA downloadable here). The recording ADC device is the excellent professional quality RME Fireface 802.

Of course re-digitizing degrades the signal very slightly but the Fireface is an excellent ADC so whatever slight change is likely very minimal though arguably it'll add some "blurring" to the signal if we accept Meridian's claims.

Wednesday, 10 February 2016

MUSINGS: On High Fidelity & Audiophilia Hysterica (Herb Reichert, February 2016)

noun: hysteria; plural noun: hysterias
exaggerated or uncontrollable emotion or excitement, especially among a group of people.

"the mass hysteria that characterizes the week before Christmas"

synonyms:frenzy, feverishness, hysterics, fit of madness, derangement, mania, delirium;

"his fictional account of an alien invasion caused not-so-fictional hysteria among the radio audience"
So I was making my rounds on the websites the other day and noticed that some comments I made on AudioStream months ago got quoted in this article by Herb Reichert. I admit I find it mind-boggling how what I think are rather obvious and factual comments about audio technology can be considered so controversial or unacceptable to some people.

As an audiophile I want to be able to reproduce as best I can (ie. with highest fidelity) what's on that CD / digital file / LP / DVD / SACD / Blu-Ray / etc... As previously expressed, I hope the music I buy is in the form of a proper mastering which captured the details available in the magnetic "master tape" or digital "studio master". In this installment, let us consider a few of the comments made by Mr. Reichert and mull over the viewpoints expressed.

Friday, 5 February 2016

MEASUREMENTS: Apple iPad Air 2 - Audio Output Quality

Although for the most part, I am a Windows and Android guy, I do have a little collection of Apple devices here at home. Despite taking a look at the MacBook's CoreAudio upsampling, measured the iPhone 6 when it came out, and explored various MacBook laptops over the years, I realized that I had missed out on one of the most important "line" of products from Apple - the iPad.

Last year, I needed to run an app for work that was only available on the iPad so I got one of these Air 2's. As a reminder, the iPad Air 2 is currently (early 2016) one of the latest versions of the iPad line (there are of course the parallel Mini and new Pro models). It was announced back in October 2014 and is considered the "sixth generation" iPad tablet. The model I have here is the 64GB gold-color version, Wi-Fi only, with newest iOS 9.2.1 installed. The screen is gorgeous with the "Retina" resolution of 2048x1536, nice and bright with great contrast. CPU is the Apple A8X (1.5GHz tri-core), 2GB DDR3 RAM internally. Physically, nice and thin with the standard 9.7" screen - great for surfing and media content consumption.

Friday, 22 January 2016

MEASUREMENTS: MQA (Master Quality Authenticated) Observations and The Big Picture...

I. Preamble:

As expected, MQA articles are popping up at the usual audiophile sites. So far, what has been disseminated to the public about the technology remains rather nebulous beyond the basic core ideas. Probably the best technical descriptions come from John Atkinson's article back in Dec 2014. It focuses on the "encapsulation" process of reconstructing high-frequency content. Then there's the Robert Harley articles from May/June 2015 where there seems to be more attention paid to supposedly important time-domain factors and MQA's role (alas, the PDF link I referenced in this post got taken down!).

Since CES2016, I see that articles continue to focus on subjective experience, and there's a chorus of testimony about the greatness of MQA (see here, here, here...). Notice the vacuousness of interviews like this. Testimony is fine and is what it is. I'm sure the MQA folks are smart... And I'm sure Mr. Stuart is a great guy... Yes, clearly Mr. McGrath can show off some well recorded material... But it was perhaps surprising how there remains so little spoken further about what the algorithm is doing or even better yet, providing technical clarification on simple questions. In sum, there's little to suggest that the science makes sense in the way it's supposed to make the music sound "much" better despite vague claims like how research in neuroscience is supposed to support the benefits of this technology (Meridian/MQA, care to reveal which neuroscience papers you're talking about?!).

Saturday, 16 January 2016

MEASUREMENTS: Stealth Releases of Good Remastering in Hi-Res Audio... (Alanis Morissette!)

The other day, a reader suggested that I check out the recent 2015 HDTracks remastered Alanis Morissette albums. I must admit that I'm not a big fan of Alanis (my sister was more into her albums), but back in the day, did enjoy the 2004 album So-Called Chaos. As I revisit the album again this past week, I was reminded of how poorly the original CD was mastered as witnessed below:

Wednesday, 13 January 2016

MUSINGS: 1st Week 2016, CES 2016, and Christmas Toys!

The first week of 2016 was quite busy in terms of getting back to work and the news feed... Let's just shoot the breeze and talk about a few things this for this post...

1. It has been fun reading about CES 2016. I've been monitoring the articles on The Verge. Mainstream broad coverage is good to see the trends heading our way. Overall, it looks like the push towards 4K TV continues with HDR being the buzz (audio industry should make note and try for some higher dynamic range, please).

Among the new VR products and Internet Of Things (hmmm... Not sure if I really want a Smart Fridge), the main audio news that so far has made it to the mainstream is the re-release of the Technics SL-1200 turntable. Clearly, at the asking price of US$4000, the "Grand Class" SL-1200G(AE) is not going to be heading to your local dance club spinning DJ vinyl any time soon! Clearly this is targeted at the affluent audiophile class. As you may know, I've been spinning LP with my Technics SL-1200 M3D for the last year and a half. The machine is built like a tank and I very much expect it to last a lifetime. If indeed the new SL-1200 street price ends up being even close to $4000, I suspect it's not going to make a dent in the used market at all!

I suspect that when vinyl gets elevated to the realm of a luxury item like the Technics, plus a ridiculous association by Sony that their PS-HX500 turntable is anything deserving of  "Hi-Res" status suggests that the vinyl awakening is in full swing and in the midst of being over hyped in the eyes of the general public (articles like this showing up already). The association with vinyl and high-resolution in the mainstream is particularly disturbing and at some point will trigger a backlash against the BS. As I have said before, there is a "cool" factor to vinyl because of it's material properties (physically tangible, size of artwork - great for talk shows when the host wants to show the album cover) and psychological retro coolness triggering nostalgia. But the idea of associating sound quality in the sense of "high-resolution fidelity" is clearly wrong - and the mainstream knows it. They just have to listen to a typical turntable playing a typical LP. Please Sony, don't do this and set yourself up for more ridicule.

Perhaps not surprising is the lack of talk about "High Resolution Audio" in the mainstream (discounting the audiophile press where they are limited to this stuff). Unlike last year with awards handed to MQA and hype around the new Walkmans and Pono, I'm guessing things have gotten pretty quiet this past year in terms of actual sales. (As I noted a few weeks back, it's not surprising when the current crop of music labelled as high-resolution is nothing but the same recycled mixes/masterings not truly deserving of larger digital 'containers'.)

Monday, 4 January 2016

MEASUREMENTS: ASUS Xonar Essence One DSD Upgrade (Part II: NJR MUSES 02 "Audio Opamp Rolling")

As you may recall, a few months back, I posted on the ASUS Xonar Essence One and the DSD Upgrade Kit. That post was only Part I because the kit not only included an upgraded firmware EEPROM to allow DSD64 playback, but there were a couple of New Japan Radio MUSES 02 opamps in there to use as well. New Japan Radio seems insistent on marketing this MUSES brand of opamps for audiophile applications and certainly the price tag is consistent with the audio "high end" - we're talking US$45 per stereo "flagship" opamp (MUSES 01 and 02)! As a result, there are quite a number of fakes out there especially on eBay so make sure you get these chips from a reputable dealer if you're in the market.

On a side note, it's interesting that companies these days are using "replaceable opamps" as part of the feature set of devices like motherboards; even motherboard manufacturers like Gigabyte are in the act of selling opamp kits!

When it comes to the old ASUS Xonar Essence One, I figure why not perform a few measurements and see if replacing the LM4562NA opamps (US$2.00 a piece) I had in there with these expensive MUSES 02's made a difference; the company claims that there's a "Profound Musicality" benefit with the MUSES. As a reminder, I had put in the LM4562NA opamps a few years ago. The stock Essence One uses NE5532 (<US$1.00) so my results may not be the same as someone going from stock configuration to these MUSES 02's. Remember that "opamp rolling" is not uncommonly discussed on message forums. And there have been some excellent write-ups in the past. Like high-end cables, there are those who swear by the improvements they hear but looking around, I have not seen anyone publish objective results from a DAC despite all kinds of testimony.

Note that there are different positions I could place these MUSES in but basically settled on the Low Pass Filter (LPF) stage which potentially could benefit all audio outputs. (In diagram below: 3A - for RCA output only, 3B - XLRs, 4 - headphones only.) I really did not have any great desire to pull out and reseat various opamps to try different configurations so just plugged them into place and closed my DAC, running measurements before and after the surgical procedure.
So here they are situated on the PCB:

Sunday, 27 December 2015

MUSINGS: The Wisdom of Simplicity [RE: Hi-Res Audio]? And a Happy New Year!

Life is really simple, but we insist on making it complicated.
--- Confucius
Everything should be made as simple as possible, but not simpler.
--- Albert Einstein (apocryphal?)
Only the simplest can accommodate the most complex.
--- Juni Kimura, 47 Labs / Sakura Systems

Let us ponder a few moments on the first "As We See It" column for 2016 in Stereophile. Humorously titled "To the Simple, Everything Appears Simple".

After reading it, I was thinking, what was this article about anyway? An admonition (based on some other Facebook comment) about the perils of blind testing? Another caution to listeners that A/B testing involves the activation of analytical brain networks rather than those we use to appreciate art? Yet another attempt to impress/convince readers that music in a high-resolution container is significant for the home listener (like comments and articles about the virtues of Pono and high-res on-the-go)? A fair warning about jumping to conclusions without considering nuances or alternatively an attempt at instilling fear, uncertainty, and doubt in what should be rather obvious observations?

As we sit here at the end of 2015, I remind readers that "high-resolution" audio has been with us now for a rather long time! Many of us interested in technology and the "cutting edge" have likely been listening, perhaps testing, and evaluating >44kHz and >16-bit audio for the last 15 years. We have seen technologies like SACD and DVD-A essentially come and either gone or linger in some state of stagnation. We have witnessed the promise of a better-than-CD but CD-compatible "format" like HDCD come and go. I suspect many of us bought "music DVD's" encoded in 24/96 or 24/48, stereo, and multichannel years ago to get access to that promise of high resolution and listen for ourselves to satisfy our own curiosity - way before the Hi-Res Audio branding hype or inflated expectations from "evangelists" like Neil Young or the corporate push (eg. Sony).

Tuesday, 22 December 2015

Merry Christmas! 2015 (NYC)

Season's Greetings everyone! As part of my travels, this past week, I spent some time at the "Big Apple"...

As expected, the crowds were enormous this time of year in Manhattan but what wonderful atmosphere to take in! The museums, the shows, the people, the food... Remarkably mild weather too.

Saturday, 12 December 2015

MUSINGS / BUILD: HTPC Rebuild... Skylake / 4K (Part II)

Okay, after laying out the foundation in Part I, let's rip open the boxes and get building the new HTPC!

Right... So I'm reusing the old Antec ATX tower case from 2003(!) for this build. It used to house an old Intel Core 2 Quad Q6600 CPU/board you see on the floor there. I put that computer together back in 2007 and it had been in constant use until 2 weeks ago so I really got my money's worth after 8 years! What I'm really impressed by is that there was still one of the early-model 1TB Maxtor HDs in there in good shape. Time to retire this board in any case... Maybe I can still put it to service at some point for my kids.

And here is the new Intel i5-6500/Gigabyte Z170X-Gaming 7 assembled with the CoolerMaster Hyper 212 Evo heatsink (and Corsair DDR4 RAM) living in the old Antec case. Blue SATA connector attached to the ADATA SP600 256GB SSD: