Strom11…upgrading cables will make a difference. The delta will be based on how resolving your system is, as previously noted.
Generally, the more resolving the more the delta.
having monoblocks is an advantage when considering speaker cable upgrades. You have the great option to place the amps very close to the speakers and run short speaker cables. (1m or less). This does two things - limits opportunity for signal degradation and is cheaper than buying longer cables! But will need longer XLRs - but with noise cancellation working in your favour.
good luck!!