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JCALLY SP30 arrived today. It has low mic input level too. Even worse, it doesn't work with my iPhone 15 Pro unless a charger is plugged into it. Not sure if a JCALLY SP7 would be any different. AliExpress takes two weeks to ship and returns are a pain.

I'm looking for a dongle with PD passthrough to charge my iPhone 15 Pro. All of the dongles I have tested so far have mic input that's too quiet to be usable. Here is my list so far of low mic DACs with PD passthrough: UGREEN USB C to 3.5mm Audio Adapter 3 in 1 Charger and Headphone Splitter...

If I set the frequency to 20Hz and start and stop the playback I hear that clicking noise when it starts playing. This happens irrespective of whether other audio is quietly playing in the background or not, so it's not the DAC turning on and off. It almost sounds like the DAC is overloading.

All of these also cause clicking on the Apple dongle but not my other sound cards: https://www.audiocheck.net/testtones_sinebursts20-200.php

Yup! Your sample has the Apple dongle clicking away at 23% volume or above. Tested with onboard sound from my laptop and all I hear is faint whooshing. Something is definably odd about the Apple dongle.

Could it be compression artifacts aka aliasing? Sorry for the newb question, but what do you mean by DC filtering?

Umm, how would your mouse and keyboard stop working? Is the dongle hosing the USB bus?

If you play this sound through the Apple USB-C to 3.5mm adapter you will hear a static like crackle in addition to the rumble: https://www.audiocheck.net/Audio/audiocheck.net_polarity_lowrumbleOK.ogg Source: https://www.audiocheck.net/soundtests_headphones.php I thought I had a defective...