Trying to adjust for room responses would require sophisticated equalizer - it is better to fix the room.
Poor systems apply such pronounced and complicated sound equalization curve that every record played on them will require different tone adjustments to make it sound acceptable. On very good system all records sound fine without any tone control. At least it was my experience.
Tone controls won't fix poor recordings - it is just not possible. Even adding a little weight to lower piano registers is not possible without also adding weight to upright bass, making it possibly too loud.
Tone controls affect imaging unless it is done in digital domain but then you add losses on A/D and back D/A conversions.
Of course ICs and speaker cables are tone controls, to a smaller degree, but I try to minimize it using short neutral sounding cables. Using tone controls is voluntary injecting into system devices, that screw up clarity and imaging (certainly not improve it). I guess I'm one of those bad "purists".
Poor systems apply such pronounced and complicated sound equalization curve that every record played on them will require different tone adjustments to make it sound acceptable. On very good system all records sound fine without any tone control. At least it was my experience.
Tone controls won't fix poor recordings - it is just not possible. Even adding a little weight to lower piano registers is not possible without also adding weight to upright bass, making it possibly too loud.
Tone controls affect imaging unless it is done in digital domain but then you add losses on A/D and back D/A conversions.
Of course ICs and speaker cables are tone controls, to a smaller degree, but I try to minimize it using short neutral sounding cables. Using tone controls is voluntary injecting into system devices, that screw up clarity and imaging (certainly not improve it). I guess I'm one of those bad "purists".