Great thread. I’ve enjoyed reading the responses of experienced audio heads on this topic.
My second system uses a 40 year old Yamaha receiver with the loudness control that Erik mentioned. The Yamaha receiver powers a pair of Klipsch Heresy speakers. I make a modest adjustment using the tone controls, down on the treble and up on the bass, to compensation for the room.
My primary system has an old Classe’ Audio preamp/amp with no tone controls. It drives a pair of Sonus Faber Auditor M speakers. One audio magazine’s (
www.i-fidelity.net) measurements show the speakers have a modest bass bump and a slightly turned down treble by design. REW measurements taken in my listening room agrees with i-fidelity.
Before I read Toole’s articles about room curves, I bought a DSP and flattened the bass bump on the SF Auditors. REW measurements showed it worked well (at that one listening spot). The trouble is I didn’t like the sound - too anemic. So now, I listen with no DSP/ no adjustments which somewhat aligns with the room curve of my Yamaha system (although the speakers are significantly different).