balanced/xlr vs. unbalanced/ single ended


would a true balanced pre/processor to amplifer (Meridian) sound measurably better than single ended/ unbalanced. all the interconnect cables are 1 meter. the speaker cables are 14 ft. for the fronts and 42 ft. to the rears. all high end/expensive cables.
Does anyone have a fully/true balanced Meridian processor/amp combo into passive speakers?
128x128jwt
Depends on the manufacturer. Meridian believes in balanced, so they put more research into balanced systems, so their system will sound better balanaced. Musical Fidelity, however, does not believe in balanaced, and don't even offer anything besides single ended.
I just went from a SE ARC preamp to a balanced ARC preamp
to utilize the balanced inputs on my JC-1 monoblocks.

The difference is night and day-go balanced.
My friend has a Meridian 565, 508.24 and yes running fully balanced was a huge difference into the ARC D400 MkII amp to power passive speakers. If the manufactures actually designs a fully balanced piece of equipment (most are not, but the Meridian is) use it!