Left speaker buzzing during low bass tones

I own a set of presonus eris 4.5 monitors and the left speaker buzzes horribly from any sort of low frequency tone when I have the volume above ~33%. The same sound is not produced when I have headphones plugged in through the passthrough. Anyone know what the problem might be or a possible fix?

crappy reference video: 

I know nothing about speakers so this is a complete guess but I assume the bass is so low and high amplitude that it's creating resonant frequencies in the casing itself, maybe causing vibrations between joints or the casing and the floor.  Turn the volume down or put a really heavy book on top of it?  lol (really heavy or else it will vibrate with the book)

sounds like the driver itself is in contact with something actually.

  On 4/9/2017 at 2:46 AM, Zeffolia said:

I know nothing about speakers so this is a complete guess but I assume the bass is so low and high amplitude that it's creating resonant frequencies in the casing itself, maybe causing vibrations between joints or the casing and the floor.  Turn the volume down or put a really heavy book on top of it?  lol (really heavy or else it will vibrate with the book)

tried your book suggestion to no avail. however when i put pressure on the cone with my finger, the buzz nearly goes away. i guess the cone is fucked?

yeah sounds like broken speakers in my semi uneducated opinion. 

One of my old speakers used to do this when, somehow, a screw got into the casing through the air vent. I was able to shake it out of there at some point.

Do you see a tear in the cone, or any weird glue issues?  

nothing from what i can see

update: if i tilt the speaker back at an angle >45 degrees, the buzzing stops. im guessing that something hanging is grazing the cone? i'm afraid that if I open it up i'll void my warranty...

Have you contacted the manufacturer? It may be a frequent issue with them.

No. The only consistent problem I have seen reported about them is a slight hum when there is no sound playing, nothing about a horrible, grating buzzing sound. I've checked their forum as well and I seem to be the only one who has had this problem.

Oddly enough, the buzzing simply disappeared this morning. No idea what has changed compared to before, but I'm not going to complain.

It's probably not this because you said yours are still in warranty (so not old), but just wanted to say this in case it helps someone else; On one of mine the volume pot on the back got a bit dusty which was causing similar-ish interference. Took ages to figure that out because I was convinced it was a bad cable somewhere in the path. Active monitors have their own volume knob which you pretty much never have to touch cos you just use the mixer, so it will sit in the same position for years collecting dust