Superchunks are broadband. they absorb all kind of low frecuencies (if a filter if placed on them of course), if not, they'll absorb everything.
If you only issue is the 120 peak, and your RT60 in low frecs is just fine. then you just need to attack that frecuency, and a tuned resonator is the way to go.
You could place it behind your desk, below the studio window :D
Big bass issues in control room
Originally posted at johnlsayers.com, topic 11921.