you can't import it directly, you need to make it into a filter which you then load into speclab. I described how to do it in http://data-bass.ipbhost.com/index.php?/topic/290-using-speclab-for-measuring-in-room/?p=4124
that looks quite noisy though, IIRC my setup had that sort of noise when I had it set to 24bit/sample in the audio i/o rather than 16bit. I would double check that, and the other fft/soundcard settings, to make sure it agrees all the way down the chain, before going further.