[Doug Plumb]

You should take an average over the listening area of 6 measurements if you are going to measure room response for a single experiment.

Measuring a single curve to optimize response below a few hundred Hz and the upper modal range of likely around 100 Hz will yield essentially random results highly dependent on mic position.

Try taking two sets of measurements with the mic in displaced figure 8 patterns for each of two sets of measurements. Make the mic placements slightly different for each of the two experiments and see what kind of consistency you get in the measurements before EQing.

This is often why EQing is misused - people essentially perform experiments that are not repeatable below a certain frequency limit. EQ applied doesn't sound right.

Each experiment should be done with only one speaker playing - so do it with the left or right to get an idea of your ability to predict a response below X frequency and above the upper modal limit.

The conclusion will be that you cannot measure effectively between two frequencies - the upper modal limit and the frequency slightly above this. This frequency is determined as a wavelength = 4 times mic spacing. = about 1 hundred Hz to 2-3 hundred Hz in most rooms.

You can apply EQ above a few hundred Hz if you measure the speaker as I outline in my manual in ch4.




Properly applied EQ can do lots of good.