dB-A / B / C filter plugins?


I’m looking for a plugin which exactly builds A/B/C filters.
(like in “dBA”).
Anything out there?
Or any Cubase 6 / Wavelab 7 presets I haven’t found yet?
Or do I have to build these with standard EQs?
Which is possible, but I would prefer some exact preset filter curve.

FYI, this is actually for evaluating audio hardware, not for sound design.