Hi,
My iLoud Micro monitors will sometimes emit a really howl-like resonant noise that is not coming from the input, but from the speakers themselves. It's certain bass frequencies that cause this.
It seems as though the speaker itself is resonanating. It's a horrendous sound, and happens even at very low volumes.
Any one else experience this? Is it a fault? Or an expected limitation of such small speakers (which are super impressive in every other aspect!)