First pic. Main living room`s A/V rack: connected, but it`s EQ bypassed and used as a unbalanced to balanced converter after installing my Integra Pre/processor and now using the Integra`s internal Audssey voicing/timing program, They are (2) White Instruments model 4660 1/3rd octave Pro. HQ EQs for the living room L/R fronts.
Next above the White EQs is the IC chip upgraded by me, Peavey EQ 31 for the living room`s systems center channel also still connected but EQ bypassed as Integra took care of the center channel voicing.
Next pic. is my (2) Yamaha Q 2031 dual 1/3rd octave in my L/R side and rear surround amp/eq. rack in the living rooms HT configuration, also connected but EQ bypassed because of the Integra processor taking care of their voicing & any timing delay.
And the third pic is the active and in use in my bedroom`s stereo system another Yamaha Q 2031 dual 1/3rd octave that I very carefully adjusted with my Ivey IE 30A RTA yrs. ago, as was used above before purchasing the Integra DHC 40.2 pre/processor.
One might question why I kept the living room`s 5 EQs in that system`s signal path after installing the Integra and running it`s voicing program..
Well I`ll tell you why.. If the Integra pre/process ever fails I can remove it and install my older Lexicon DC1 with Dolby option pre/processor until I can either fix or have fixed, or replaced with a used one allowing me to just reengage the living room`s EQs..
I like to have a audio equipment backup plan.
I have been active with RTA 1/3rd octave voicing sound systems starting since late 1978, and never owned a lesser bandwidth EQ nor used any for my audio systems as less than 1/3rd band EQs tend to act more like glorified tone controls, and which wouldn`t have the tuning/voicing bandwidth resolution that I was looking for in my system`s voicing applications.
Saying that doesn`t mean that I turn my nose down at folks who own & use them, just they weren`t fit for my intended use.
Ciao