Bill,
I have both, the roofing filter and the audio mods in my Omni IV+ and am very
pleased with them.
I have the 600hz roofing filter for CW work which is switchable. I have no
way to measure the differences, but to my ear it makes a vast improvement.
I didn't like the audio quality on SSB, and though not much of an SSB
operator anyway, I went ahead with the audio mod. It's cheap, but only fixes
part of
the problem. I ended up adding the INRAD 755 SSB filter as well. That
eliminates the ripple in the bandpass, fixing the rest of the problem.
Bottom line: Money well spent.
Good luck.
73,
Chuck K4QS
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