the most likely issue with low cost stereo DACs is clocking.
the one cited by chris has its own PLL which it claims replaces the need for a master clock if ganging them together. somehow i doubt that the cheaper ones even bother with this, let alone pins for a master clock.
On Wed, Apr 4, 2018 at 2:24 AM, Peter <list@xxxxxxxxxxxxxxxxx> wrote:
Dear Chris,
Am 03.04.2018 um 20:34 schrieb Chris Chronopoulos:
> i'm aware of ADAT, but the motivator here is cost/scalability. most ADAT interfaces are optimized for input with preamps, etc. plus it's limited to 8 channels per link, so there's recurring overhead if you want to scale higher.
> imagine trying to do high channel count (e.g. spatial audio) on a budget. i'm not aware of any configuration that will get you >16 channels analog for <$1k.
An alternative would consist in low-cost I2S devices, like the Adafruit I2S Stereo Decoder - UDA1334A.
I don't know anything about the sound quality, but it's a stereo DAC below 10€. I'm not sure how many
I2S devices you can plug at a raspberry. But since there are ALSA driver available, this would would provide
a starting point to possibly connect several of those devices. This could be a low budget route.
Presumably there are I2S DACs with more channels.
In addition, last December there was a thread on "recommendations for output-only audio devices",
where a < https://www.minidsp.com/products/usb-audio-interface/ > was mentioned.u-dac8
Best regards,
Peter
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