Equalizers: Schitt; Rockville; DBX; Chinese Branded DBX
Dual Channel (l&r separate); 31 bands (1/3 octave) give the best flexibility. 1/3 band effects adjacent frequencies less than 15 or 10 or … band units.
First: adjust l/r individually for the space if needed: then an alternate adjustment l/r individually for your hearing if needed. Nearly all have Bypass Feature (pass thru) to retain a preset EQ curve when in-line; no eq action when bypassed. Some units have Memories for several curves.
Bypass could work if you have your hearing aids in, and/or friends with ‘normal’ hearing with you. A curve for your ’hearing aids out’ could work, perhaps more precisely than your hearing aid(s).
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Schitt Lokius 6 band equalizer adjusts both L and R together, much less versatile for a space and/or your individual ears.
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Rockville Equalizers DO NOT have Center Detents letting you feel when a slider is centered. If a unit is located other than eye-level, that is a helpful feature.
If you bought one, and that makes a difference, they have free returns, they send you a prepaid label, you drop at UPS.
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DBX Dual Channel 31 Band Equalizers HAVE Center Detents. Models 231; 1231; 2231.
The models 231 and 1231 both are 2 U (U = 1-3/4” rack height) 3.5” high.
Model 2231 adds optional DBX type 3 noise reduction, (and other features) and is 3 U high 5.25”. Even if you do not need the extra features, the sliders are ‘taller’, easier to adjust than shorter ones, if you can fit the extra 1-3/4” extra height in a workable location.
DBX (made in Malaysia, i.e. assembled in Malaysia with Chinese parts) and Many Chinese Units use the same 231; 1231; 2231 designs. Most have identical features in identical locations, identical sizes and weights. Some, not dbx labeled on the front are labeled ‘harmon …’ on the back.
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One 2231unit EB831EQ ($190. Free shipping) I found on eBay is located in USA, thus shipping, 60 day return is in USA. Verify voltage/plug for your country.
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Others exist of course.