Who does make excellent EQUALIZERS???

I am using the Accuphase DG-28 equalizer. It works in the digital domain - no signal degradation.Control is 1/6 octave.Can be adjusted manually, or using their algorhythms.
You can measure your room reponse with a supplied microphone.
It puts out a signal through your speakers that is then measured and corrected. It really works, especially in the bass.

Hi Herv,
it largely depends from the level of your front-end; a good choice was the old Technics, parametric, slim line series SH 9010 or similar...
If you have a good front end, the only one is CELLO Audio Palette; but is it strictly neccessary?
ATB, form Italy, Diver

Z-Systems RDQ-1 or RDP-1.

Other than above Accuphase made a two channel EQ awhile back with 31 bands per channel - it had a great look - I think there is one for sale on Ebay.

You need to qualify excellent... a Cello Pallette is going to cost you well more than $10K... the Manley, Accuphase, Z-Sys, GML are all going to cost north of $5K. The Z-Sys won't work for you because it operates strictly in the digital domain and doesn't have A/Ds - D/As. There is also the TACT room correction devices. Anything less than these eq's is a compromise and should probably be avoided. You are better off with room treatments than introducing an eq.