Vibrations coming from my cab (Parsek 600F32)

[ale29]

I have recently purchased a used Parsek 600F32 cab.
I have noticed that when boosting A LOT my lows (I don't really play with these settings but I did that for test) and/or play at very high volumes, there's a vibration coming from the cab when playing my Low B note(kinda like a rattle).

I tried to use cable ties because I saw that some cables in the cab were just lying around: the result is that now the vibration isn't coming from my Low B note, but from the 7th fret of my 5th string (and a little bit from the 6th fret).

Every kind of vibration disappears if I do some pression with my hand/fingers on the wood panel which divides the cab internally, it's difficult to explain with words so I took a photo (in the photo i didn't use cable ties yet)
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Any idea on how to solve the problem?

 

[billfitzmaurice]

I think the brace is loose. I'd drive some 2" screws through the baffle into the brace. Be sure to pilot and countersink.

 

[guitardefector]

Are they "good vibrations"?

 

[ale29]

No, they aren't good vibrations at all

 

[ale29]

I tried to beef up the juncture with some hot melt adesive but it did nothing.
To be honest, this problem seems to appear only when boosting my lows a lot (+15 Db on 40hz and 80hz on my head EQ etc.), while in a "normal" situation I find that I shouldn't encounter any problem (didn't try yet to use the head at its max volume before clip because i'm at home and i have neighbours).

Isn't the method billfitzmaurice posted quite risky? May I encounter a different response from the cab after the modify?