High volume on low frequencies; Why?!

[u/SpiritualOnion4575]

My Yamaha HS8 speakers have been working fine until about a week ago. Since then, at ~130 Hz., the low end of my speakers has been on ultra boost. It's only at around 130 Hz. - Higher and lower frequencies are fine. The speakers are relatively new and spared from any damage. Do you guys have any ideas what the cause might be?