I did not explain myself well, I referred to Bass-Reflex vs Line Transmission, subwoofers ..
About high-pass filters, in my cheap second system, computer and usually nearfield, with my
modified KEF Q100 5.25" coaxials I have the front bass-reflex closed (bad design by KEF) and this in my JRiver MC 64 bits. Sounds better.
PEQ only to make a bass boost.
Soft touch -ups at higher frequencies via
rePhase -> Convolution filter -> JRMC.