To design a speaker system as complicated as Bob it helps to have a decent measuring system. I use TrueRTA and a Behringer ECM 8000 microphone. This page shows some of the measurements. All measurements were done in-room at the sitting position. The room obviously plays a huge part in the speaker's sound, and also the measurements. As the diagram shows, my room is very big, with 4m ceilings. However, due to beams and practicality, the speakers aren't in ideal spots, especially the right hand one. The wall comes in too much behind the speaker resulting in some bass cancellation. I would also prefer more room behind the sitting position.
This first graph is without any EQ, just the crossovers. The peak at 500Hz is a dipole effect and nees to be EQed out. Below that is the dipole rolloff for the mids, and the dipole rolloff for the bass is very evident. The speakers are slightly toed in, so this is actually an off-xis measurement, hence the treble rolloff which is to be expected in-room anyway.
This is an earlier attempt, when I was using the Driverack's Auto-EQ feature. It isn't the most precise tool however, and consistently understates the amount of bass. Hence the roll-off.
After much measurement and tweaking this is the latest graph. After doing it, I took out the slight peak around 5kHz. It has parametric filters applied in the bass for room effects.
I've been asked about my exact EQ settings, and would hate to disappoint, so here they are:
Treble is set at -7dB, Mids at -11dB, Bass at -7dB.
The mids have a 12dB low shelf of 6dB octave at 100 Hz, plus a parametric 6dB boost at 20Hz with a Q of 1. There is a - 4dB notch at 450Hz with a Q of 2.63.
The bass has a boost of 12dB at 77 Hz using a 6dB low shelf plus another 12 dB boost at 20Hz with a Q of .71.
There is also a - 6dB low shelf at 155Hz to cut the bass for the difference in radiation between the bass and mid drivers.
The dip at 40Hz is a room mode.