Is a higher bitrate possible?

[tfry-git]

Nice project! I was wondering whether an ESP8266 would be up to this job, and came across your work. Personally, I'd like to get some higher quality. For this, I'm thinking to use a PT8211 DAC, which should give much better quality, while it is still really cheap.

However, I note that you set bitrate to 33kps, specifically, and I can only guess that you hit some limit at this point. Is that correct? Do you have any insights on where the bottleneck is at? Is it:

1. the I2S bus itself
2. the CPU load for PWM coding
3. the networking?

For 1) and 2), using an external DAC should allow me to get around the limit, easily. For 3) it would be a different story.

Thanks!