Jeff,
> can i buy a spectrum analyzer like say the phonic PAA2 <
As Tiny said, that's not going to help in the small rooms typically used these days for mixing. Though it would have been useful if you mentioned the size of your room.
Besides needing to assess the response to 1/10th octave (or finer), that's only half the problem. The other half is modal ringing and early reflections, and an RTA can't show you that. Even more to the point, it doesn't matter what you measure anyway, because the solution is always the same: broadband absorption that works well to as low a frequency as possible.
--Ethan
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