hi everybody.
After mucking about with REW with the DEQ 2496, I've moved on to play in the big league, the DEQX unit.
However, I'm getting poor results when using REW for full range measurements, and I'm very sad about it...
( ha ha )
To refresh memorys and by way of fuller explanation, I'm using an ECM 8000 microphone with the generic correction files loaded, into a Xenyx 802 ( replacement unit for the UB 802) then of course into the soundcard.
I seemed to be getting 'acceptable' graphs when measuring the results of using the DEQ 2496, but the graphs now don't look that good, as you will shortly see.
here is the graph of the verification measurement done by the DEQX unit after calibrating the speaker.
verification measurement phl focal.jpg
Without moving the speaker or the microphone, here are the resulkts of using REW to measure the speaker, firstly with a 20 to 20 sweep, then by 1/12th octave auto measurement.
rew plot phl focal, sweep and 12th octave.jpg
As you can see, the plots bear no resemblance to each other, let alone the results of the DEQX verification.The rising graph is the sweep, the interesting descending one is the 1/12th octave.
I don't even know where to begin to explain it, and am really hoping that there is a simple explanation. What I really don't get is why my graphs using the DEQ 2496 at least looked in the ballpark, these look waaaaay off.
Just noticed the scales are wrong in the picture, sorry but I don't think that will prevent understanding of the problemo
lots of love
terry