Category Archives: Audio

Vidar Invades Camp Dismal

Vidar photo is a stock image kindly provided by Schiit Audio.

FedEx beat its delivery promise to bring Vidar to Camp Dismal 2 days early. So we had an unboxing and installation, both fairly trivial and got to have a first listen playing the Thile-Mehldau eponymous duet record and Judy Collins In My Life record. The Judy Collins record features her beautiful voice singing Leonard Cohen, Bob Dylan, and other songs with an electric backing. Vidar pairs nicely with my Dhalquist DQ-10s and has been a perfect gentleman since arrival.

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Ampzilla’s Passing

Last week my beloved Great American Sound Ampzilla amplifier overheated. The lounge began to smell of hot linen. At first, I thought my sense of smell had gone wonky again. My sinus allergies can cause strange smells from time to time. So I took some antihistamine and started the air-con fan to filter out any particulate that might be about. A half hour later, the smell was still about unabated so I started checking for overheated electrical things in the lounge. I found Ampzilla with a high case temperature and no air flow up the chimney. Very odd since the fan is a Rotron Boxer powered off the line. What to do, have Ampzilla refurbished or purchase a modern replacement? More after the break.

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I started this piece in response to an inquiry from younger friend Matt who is considering purchase of a nice audio system. Said friend is a professional software engineer currently at FaceBook, moves with some frequency, who has varied musical interests having played trumpet in high school bands, and guitar and bass off and on, and has fairly eclectic musical interests.

I don’t know if he will trade equipment as frequently as he trades jobs. I’m guessing simplicity is important, durability to withstand moves, durability to withstand loud playback, and non-fatiguing reproduction of the various metal genres. This may mean rolling off the high end in playback processing to loose some of the distortion harmonics.

My financial advisor is also interested, initially as a headphones listener but maybe as a speaker listener. He has a largish home and could probably find a room to use as a listening space. He’s currently an iPhone streaming user who has outgrown ear buds and would like to move up to headphones. He’s married with children so spousal acceptance and resistance to acts of children are factors. The children are at an age where they can be introduced to music listening.

Read on to learn more about building a high performance audio system able to play a broad spectrum of musical genre and styles. The material after the break reflects my experience from 50 years in the hobby, my evolving taste as a music fan, and directions in the modern component audio system industry.

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Schiit Pi?

Those of you who saw the John Darko interview of Jason Stoddard and Mike Moffat filmed at the 2018 RMAF know that both have a passion for Schitty puns. During this interview, Mike teased a “Schiit Pi” concept. Mike’s idea was to embed an ARM processor in products to pick up additional digital signal processing tasks beyond the abilities of the Burr-Brown parts he had been using.

Jason is adamant that Schiit will not become a “software company”, that is offer IOS and Android apps or make devices having a significant user interface say like Roon Controller or Volumio remote. The ongoing maintenance of these products is simply too costly for the Schiit minimalist value first design esthetic.

A Minimalist Streaming Player

So can we make a minimalist streamer using a hatless Raspberry Pi? If we did, how would it sound? This product is as basic as a Roon Player can get. It turns out to be a very good one. Will Jason put it in the catalog? Probably not. Volumio got there first with more software integrated.

Those not wanting to tinker with hardware and software will find Volumio Primo a good alternative that provides a SBC and DAC supporting AirPlay, Rune, Roon, Spotify, and others but excludes the headphone amplifier. John Darko’s review is excellent and he likes the sound of Primo and the value offered. Primo is comparable, maybe not quite as sweet as the Allo Digi+ Signature. However, the ALLO devices requires you to bring your own DAC.

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More Schiit — Modi and Magni

The Moocher had been mixing church service recordings using the DAC and amplifier built into his 2017 5k Retina display iMac. This sound is not bad but not the best. After a year of fatiguing sound and an inflating checking account, it was time to purchase something better for the desk. Having Gumby aboard for 9 months, what better choice than Schiit’s Modi and Magni. These two $99 products account for 1/2 the company’s revenue.

So, $200 gets you a complete personal audio system less speakers or headphones. How does Jason perform this magical feat? (The Moocher is pretty sure Jason has been to the Highway 51 Crossroads.) First, the design is minimalist, just the bits needed for brilliant musical reproduction are present, no less and no more in this music first design. Point of sale graphics, fancy cases, auto input selection logic, etc are all left out in favor of a sophisticated circuit topology, carefully selected components, and quality construction and testing. Second, they sell direct. No distributors or retailers adding vigorish. Third, they have low failure rates resulting from careful design, design testing, quality builds, and build testing. Everything runs for a day on the burn in rack to catch weak parts or assembly flaws.

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Digital Recording of House of Worship Services

This is the first of a series of articles about contemporary digital recording practice in a volunteer church service recording context. The advent of digital mixers and digital audio workstations has completely changed this game allowing a patient amateur to make a clean pleasing service recording for distribution to shut-in and traveling members.

Those wishing to learn more about copyright in house of worship program production are advised to see reference 1 for a complete discussion. Copyright law specifically exempts houses of worship from royalty payments for material performed or presented as part of a worship service proper. Houses of worship are required to pay royalties for non-worship use of copyrighted material not in the public domain. For this reason, we distribute service recordings to members on physical media and include only material copyright by the church or our speaker in our weekly sermon podcast that is publicly available.

After the break, we’ll talk about track capture off of a digital mixer. Although not hard, each mixer has its quirks and limitations so our intent here is to alert you to typical challenges and limitations rather than to provide switchology for a specific mixer or mixer family.

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Music Discovery in the 21st Century

Are streaming services evil? For some. For others, they are the gateway to new artists, concerts, and record purchases. Audiophiles that have made the leap are in this latter camp. There’s more to life than the next Beatles reissue. Read on to learn how Roon, Qobuz, and Tidal combine synergisticly to promote artists and music. Roon 1.6 Radio is the secret.

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Allo Digione gets a Face

John Darko of Darko.Audio fame asked what you hide your Raspberry Pi based audio player behind. That got me thinking. Give it a face like a Bryston Audio BDP-Pi player. Could that be done?

John was a fan of the RoPieee Linux plus Roon Bridge distribution so I gave RoPieee a try. In reading the RoPieee installation notes, I noticed that it supported the Raspberry Pi 7 inch touchscreen display. Having one lying around, I decided to add it to the basic Signature One player.

As always with DIY, some assembly is required and it is not all in the fine manual. I was using my display with an Allo DigiOne Signature HAT assembly. This HAT blocks access to the GPIO power pins. Oops — what’s the work around. Keep reading after the break.

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MacOS Software Defined Radio with GQRX and RTL-SDR

Radio, like most else, has gone digital. In the early days of digital signal processing, pioneers realized that many modulation and demodulation techniques could be performed by digital computation.

As computers became cheaper and faster and integrated circuits became cheaper and faster, it was inevitable that the guts of radio receivers and transmitters would be mostly digital and that computers would do much of what went on inside new radios.

This post will describe the initial exploration of GQRX and RTL-SDR here at Dismal Manor. Most of what is already written on the Internet neglects to mention a couple of details the Moocher learned the hard way. Find out what these are after the break.

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