Okay that makes sense. Sounds like it would be a good idea to re-do the room measurements with the pre-amp included this way, even with the NT1. The other thing is I did all measurements with both the RS meter and the mic pointing directly (horizontally) towards the speakers. I have just read some other posts recommending that the mic/meter should point upwards toward the ceiling. I'm not sure what difference that would make but I'll do some measurements that way and see.
I tested one of my other monitors today and got pretty much exactly the same result for the area above 3kHz. So it looks like the problems up there are due to something to do with the mic.
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I guess the NT1 could be damaged somehow
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I hope not! I've never dropped or knocked it and I've always kept it in its hard protective case. Also, I haven't used it all that much and love the sound I get from it; I've certainly never noticed any problems with it. So unless it was damaged in the shop or was faulty to begin with.. I'm going to call Rode and run those test results by them and see what they say. Perhaps it could be a characteristic rather than a fault, or maybe that wonkiness is just too bad for that..
Do you think it would be worthwhile going out and buying a Behringer to re-do the measuring? I'm going to hang on to the NT1 unless it becomes clear it is faulty. Also, is it not the lower frequencies that are the most relevant in terms of the room treatment and I already know that the 100Hz dip is a problem there? I suppose the above 3kHz problems could bring that into question, i.e. is my mic really reliable across the rest of the spectrum?
I am conscious this has been going on a while brucek. I do really appreciate your on-going help with this and I hope you don't mind all the posts and replies. I think I'm getting there, once these anomalies can be sorted out. When I'm done, perhaps there is a way that I can show my appreciation (a donation of some kind or whatever?)
Thanks again,
Mark