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Hm no,

with the std audioshield, and proper connections (shield soldered directly to the teensy, or with a PCB) there is no noise - never had any - even with *very* fast SPI to a display.
Don't...

soerena: i'm using this here:https://forum.pjrc.com/threads/46168-posted-Commodore-C64-Emulation-on-a-Teensy-3-6-Microcontroller
without buzzing - so, it works (with ili9341 display (spi) ), and it...

The best is, to attach the audio-shield directly to the teensy - with pins/sockets. don't use wires or breadboards..

I meant the amplifier.
The DAC can not meet any audiophile claims. It's not built for that.
Maybe it's possible to pull down the DAC with a second pin (?), or maybe it's sufficiant to switch it...

Yes, or, decrease the volume or mute when nothing is played ?

Hm, ok,
i tried your sketch.
It was the first time i connected anything to the DAC.

The good news: I can reproduce this. It is very quiet, almost not noticable with the speaker at room volume....

Hm, that really loks like a software-problem. Or a strange silicon-bug (dma..i2s..? maybe a race-condition ?)
Jerware, is there a chance that you upload your project and all the files we need to...

In the wavefile above, there is very interesting pattern:
Eactly 100 samples are ok, then exactly 28 samples with higher values. 128 byte is the size of one audiobuffer.

There is a peak at ~344 Hz. The update() freq. is ~2.9 ms so this fits perfectly.
Sometimes i noticed the same noise when i wrote my mp3 player, but this was with the audioboard.

https://forum.pjrc.com/threads/25835-BUG-FYI-16-32Bit-access-to-adress-0x1FFF_FFFF-cause-hang-%28Teensy-3-x%29?p=62281&viewfull=1#post62281

Hmm.. a guess: You're using 1.20?
if yes, can you please try 1.21test2 ?

Maybe one of the buffers crosses the ram-boundary, located exactly at the half of ram..
121 adresses this issue