My advice; hang it up with offline EQ because with a graphic EQ, you need to be able to audition while moving sliders.

There are two plugins I would recommend here for free; you should use both a graphic EQ as well as a spectrum analysis tool

For a nice linear phase graphic EQ, http://www.voxengo.com/product/marvelgeq/

From the same company, get their fft analyzer, SPAN http://www.voxengo.com/product/span/

If you put these in a chain, try an instance of span, then the eq, then span again. You should be able to hear and see the changes you are making.

You might be dealing with room effects that will be hard to fix in your room without absorption treatment of some kind. Refer to posts from several weeks ago.

-Scott

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