Treating A Floor

[jwl]

It will be tough to treat without tearing up the floorboards. Insulation between the joists will likely help some, as will adding more mass to the floorboards (please have a structural engineer check out your plans before you add mass beyond what the structure can handle).

For dimensions, you can look at room mode calculators: RealTraps - ModeCalc

In general, make the room as big as you can, and make sure no 2 dimensions are the same or even multiples of one another. If you do this, and treat the room well, you'll likely be pleased.

More on treatment here: RealTraps - Acoustic Basics

[rblythe]

Thanks for the reply. I don't own the building so I couldn't change the construction of the floor. I'll just have to look at other options.

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[DanDan]

What is your activity? Recording or Mixing or both? What instruments?

A low rumbling floor might be a useful bass trap in a CR.
If it is really very resonant it might be a problem, adding bass decay, but this is unlikely once you have equipment and yourself in there. Measure the acoustics to find out.
Such a floor would be a problem when recording large heavy musicians flailing around violently, and not if that is not what you are doing.
These compliant floors/ceiling usually have very little Transmission Loss, i.e. very little soundproofing.
DD