On Tue, Jan 26, 2021 at 2:09 PM Matt Garman <matthew.garman@xxxxxxxxx> wrote:
The ma12070p is a newish digital input (I2S) class D amplifier
(essentially, a "power DAC" or a DAC and amplifier in one chip).
Between the RPI and amp is an Allo Kali I2S reclocker. I don't think
the Kali adds any meaningful latency, as I've used it extensively with
other I2S DACs, and never before noticed lag.
I've got a Kali too; it's definitely a buffer; that's its design, I believe; essentially a FIFO buffer with good outgoing clocks. You can actually see an LED on the board that indicates whether the buffer is full, and see that it lags behind audio starting and flushing out. I get that you didn't hear a latency before, but I bet that the ma12070 ALSO has a buffer, and you're just seeing buffer + buffer + network add up to "perceptible".
That setup sounds cool, though! I might ask you more about it off list; I've been interested in using I2S with the PI, but have always been a bit spooked by the details.
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