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Thanks Ludo and Goneten

Ludo it seems to me then that trying to isolate measurements from specific directions isnt really practical on a (very) modest budget.

What would be a good but cheap microphone or SPL meter to get then  for omni directional measurements?  I'm envisaging downloading the Room EQ Program and using my laptop.

I'm interested in trying to measure the effects of room treatment.  I assume that I would mount the microphone at the listening position run a pink noise CD and record the output. 

Alternatively could I feed a signal generated my the software into my amp whilst simultaneously recording the output from the mike on the same laptop, instead of using a CD?

If I understand you correctly I may not need to get a USB sound card as well?