Audio

Reminder: Auphonic is still a terrific audio tool!

Auphonic on Lenovo X-1-Carbon copyIt now seems half-a-lifetime ago that I used to commit an hour or two every Friday to join Randy Resnick’s VoIP Users Conference (VUC) calls. That long-running project developed a global community of like-minded geeks, addressing a broad range of technology topics.

If you’re not familiar, VUC was a live call-in podcast that ran from 2005 to 2018. There were around 800 episodes, with numerous guests from the far corners to the communications ecosystem.

It started on a service called Talkshoe, accessible via telephone and SIP. After interviewing ZipDX founder David Frankel (VUC381) about his (then) new project it transitioned to the ZipDX wideband conference platform. Sponsor Voxbone (now part of Bandwidth) was able to provide dial-in access numbers in dozens of countries. When Google introduced Hangouts, VUC naturally transitioned to that new video platform, but always maintained integration with the telephony realm.

One of the things the project required was post-processing of the recording each week, to ensure consistent sound level for all the various participants. In a podcast, dramatic changes in level from speaker-to-speaker is very jarring to the listener.

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Unexpectedly Handy Gadget: USB A-to-C Adapter

Stella &I have been carrying Google’s Pixel phones since their introduction. Each time we bought new phones they came with some accessories. The Pixel 6a we currently use didn’t come with power supplies, but they did ship with a USB-C cable and little USB A-to-C adapters.

Google USB-A to C adapter

In earlier times we needed an A-to-C adapter to facilitate migration from the older phone to new model. Thereafter the wee widgets collected in a junk drawer. That is until recently. I’ve stumbled upon some uses for them.

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DAC32: A New Squeezebox Alternative From Germany

This week I was tipped to the availability of a new streaming music player from PolyVection in Germany. Their DAC32 is a nondescript little device that emulates the venerable Logitech Squeezebox.

The company has a nice little historical explainer about the Logitech Media Server & Squeezebox. We got our first Squeezebox back in 2004 (I think) well before Logitech acquired Slim Devices.

DAC32 is essentially an embedded host for Squeezelite, the very same player that is bundled with PiCorePlayer for use on Raspberry Pi. DAC32 includes the host platform & digital-to-analogue conversion (DAC) in a tidy, integrated package. Connectivity is provided by onboard 2.4 GHz b/g/n Wi-Fi and Bluetooth. Power is 5 vdc via a standard coaxial connector.

DAC32 streamer front

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Music on the Front Porch with HiFi-Berry Amp2

If you’ve been here before you may already know that we enjoy a multi-zone music system based upon the long-abandoned Logitech Media Server and Squeezebox network music players.

Actually, that’s only partly true. We still run LMS, but the Squeezebox hardware has gradually been replaced with a fleet of Raspberry Pi SBCs fitted with HiFi Berry DACs, paired to small, powered audio monitors. The four indoor zones all follow this pattern.

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Logitech Squeezebox 3 vs PiCorePlayer on Raspberry Pi 3B+

Long, long ago, in the earliest days of this blog, I described my DIY approach to a whole house audio system. The strategy centers around a collection of Logitech Squeezebox 3 streaming audio players, each mated to a pair of powered audio monitors. All this worked great until the aging SB3s started to fail. Drying electrolytic capacitors cause arthritis in electronics.

Squeezebox_v3

Faced with failing SB3s, and the occasional desire to grow the installation, I resorted to using a most excellent combination of the Raspberry Pi3 B+ single board computer running PiCorePlayer in combination with a HifiBerry DAC. I’ve got HiFiBerry DAC+ where –10 dbm RCA output is suitable and DAC Plus Pro XLR where +4 dbm XLR balanced output is required.

hifiberry dac in steel case

The RPi, HiFiBerry and PiCorePlayer combination work great! They outperform the original SqueezeBox 3 in every way, save the lack of an IR remote control. Also, they cost less, even with the fancy metal case.

hifiberry pro xlr in case

All the above is preface to help explain something that I discovered this past weekend. There’s a fundamental difference between the behavior of the SB3 and a RPi/HFB combination.

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