# Music gear

## Digital amps and mics for the prissy yet broke

With special attention paid to building sound systems for small mountain villages in Daerah Sunda.

As far as my ear canals go, after extensive experimentation I can tell you that hands down the best bang for my buck is in-canal foam-tipped headphones. My current preferred option is the Shure SE215 for jack connection or if I must use bluetooth, the Shure BT-2 bluteooth adapter. (the original Shure BT sounds like a shenzen pirate knock-off of a Shure product; avoid.) I had some higher-end Shure earbuds, and they are somewhat better, but the ROI tails off rapidly, especially for something which I will carry with me everywhere and lose at a fairly high rate.

Apparently the entire world wants entirely wireless earbuds, which I do not like as I know myself and I am clearly going to lose them and I hate how they have a special case etc etc. They have variable difficulty in changing their batteries. I wonder how the battery change will go in my Shure BT-2, if I can keep it without losing it long enough to need to change a battery. (Aspirational battery changer, me.)

IEEE has a review of various options including cheap Chinese imports such as DQSM D2 (USD168), the Tennmak Crazy Cello (USD50), and the LKER i8 (USD37),

All provide good, if not perfect, sound at low cost.

I do not always agree with IEEE but this is a compelling argument to test at least.

## Audio interfaces

For getting analog sound in an out of your digital device.

### Cheap and cheerful

• audioinjector/flatmax in Sydney make a variety of multi-channel raspberry-pi-focussed soundcards for your embedded audio needs. e.g. 8 channel monster Octo. Kickstarter price for these babies is USD44, which is impressive.

• Blokas make pisound whichi aims for high resolution audio (24bit, hi sample rate) + MIDI output. The spec claims 110db noise floor in optimal conditions, so this is actually 18 bits. Regardless, 110db is not bad for a noisy embedded device. Has neat puredata integration using the pisound app.

• CM6206

is a highly integrated single chip USB audio solution. All essential analog modules are embedded in CM6206, including 7.1CH DAC and earphone buffer, 2CH ADC, microphone gain, PLL, regulator, and USB transceiver. It is very suitable for high end USB external audio box, USB multi channel Headset or USB multi channel speaker set.

I am not convinced about the high end thing, especially for inputs (bare minimum it would need to be competently isolated). However, cheap. So cheap. Available on, e.g., ebay.

### Fancy

Sound Devices MixPre series are mixers/recorders/class compliant sound cards. Minimalist, apparently nice sounding. Expensive. A cheaper, maximalist alternative is e.g. a Zoom recording mixer, such as the Zoom Livetrack. My experience with Zooms has been a little lo-fi, but I am told they sound better these days?

#### RME Fireface

I have an RME Fireface UCX.

I constantly need to know how to put it in and out of class compliant mode. Here is the relevant manual excerpt:

Operation Activation of the Class Compliant mode: Connect the UCX to power and switch it on. Turn the encoder knob in Channel mode until SU appears in the display. Press the knob once to activate Level mode. Turn the knob until CC is shown in the display, then press and hold the encoder until the display shows on (pressing the knob again will make the display show oF, indicating CC mode is inactive). The unit will reboot, all LEDs will light up, after which it will be in Class Compliant mode.

Check if CC mode is active: CC mode is active when turning the encoder lists not only CC, but also C8 and CA in the display.

In class compliant mode it works with iOs and Linux; in normal mode it works with macOs and Windows. Other combinations lead to confusion.

## Speakers

You know, for playing audio loudly? I would like ready access to a selection of portable sound systems for musical mayhem.

• Cory Doctorow points at some lightly modded consumer class-T gear

• Glenn Zorpette does a cheapo hifi rundown

Yes — class D amps are better and cheaper than ever. This is the smallest, cheapest, and most surprisingly reliable option. Otherwise I just bought one of these and it really is almost 2 x 100W. Hypex is much more expensive, but actually proper hi-fi. These cheap \$20 boards are good enough but totally expendable if you want them to be. Also of course — the two boards I linked you to are both 12-30V (ish), which means they are 100% battery suitable. Typically the best configuration is to put two 12V batteries in series to get 24V — at higher voltages the boards are more efficient. If you want to run off mains power, then that Yuan-Jing site has power supply options.

## Cheap snakes/multicores

Copper is expensive. And multicore mixing snakes Can I turn a CAT5 cable into a multicore? CAT5 is freely available second hand and easily replaceable. Real multicore is expensive, hard to fix and hard to find in, e.g. Indonesia where I have been asked about this a lot.

TBC.

## Cheap DIs that are not terrible

sucks air through teeth

## Cheap retail hacks

• Thomann is quite cheap
• You can buy off American retailers at American prices if you get a re-shipping agent. For some stuff, such as headphones, this can be crazy cheap.

## Cheap streaming

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