I use a calibrated Apex 220, with preamp, connected to my Powerbook. On my powerbook I use Chris Liscio's great Fuzzmeasure software. current version is 2.0.11.

I usually measure at the listening position rather than 1 meter from the speakers. Line arrays are kind of aways anyhow.

And, of course, while its not currently in my "loop", I have a DOD 2/3 octave constant Q equalizer. Altho, modifying the crossover position and volume can serve as a kind of tone control modification.

Tweaking in this way can be lots of fun and takes lots of time. I'm not currently set up for this, as I'm remodeling the room that my system is in.

Marlboro