you just cannot generalize.
to me dsp would be an alternative to room treatments for 2 channel, not cables. consider maybe a product such as GIK treatments as an alternative to dsp for 2 channel.
https://www.gikacoustics.com/?gclid=EAIaIQobChMIhuDZoNCP-wIVdR19Ch2Pcg5rEAAYASAAEgKWD_D_BwE
the question would mostly be whether your issue is more in the bass or slap echo. dsp will not fix slap echo very much, it can smooth the bass. dsp is the poor step child to the proper room set-up. dsp will dumb down your 2 channel signal and take away life from the music to some degree.
some cables might reduce brightness from slap echo, but then it would also be costing you musical information and top end extension.
maybe if we saw pictures of your room then we could be more helpful.
personally i have a very extensively treated purpose built 2 channel room with a pure analog signal path, then a totally separate home theater with 9.3.6 speakers and a Trinnov Dolby Atmos dsp processer. my Home Theater has no room treatments as it’s in my house and my wife is against them. my 2 channel room is is in my barn and i can and do do anything i like. cables for my Home Theater room are quite basic, my 2 channel room has more exotic cables for the signal path..