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Did you try REW, it's free software but very comprehensive. The 50hz is a room node that most of us in London have. REW will provide settings for a parametric eq which levels it out while doing the least possible damage to the surrounding frequencies. I think you can create a parametric eq to sit over your computer outputs if you're on a Mac. I have a MOTU D8 which handles the output to to my convertor which has a parametric eq built in.
REW also shows a psychoacoustic smoothing of the measurements which helps to get a better idea picture of what the measurement is.
Nothing below 35hz is pretty normal/acceptable for music, there's a bit more down there in movies.
Mind you, looking at the flat response you got from the Dirac processing, you'll not get anywhere near that with a simple parametric eq. My near field system is about that flat naturally, but you would expect that from PMC.
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Airhead
yeah, nothing I listen to needs <35hz, that's for sure.
I found that a better curve for the tannoys was to reduce the hump by about 50% then follow the gradual roll off (rather than the flatter target shown above).
using a umik into the imac