Tony, I have no doubt that the sound jumped in quality dramatically by utilizing cables over jumpers. Many manufacturers use shortcuts at shows due to logistics and constraints of shows; some don't feel jumpers are so detrimental to the sound, while others feel pressure to get the rig set up in time. There are also arrangements regarding cables possibly with other manufacturers, etc. Some feel the speaker should be heard "stock" and not enhanced.
A person cannot be assured that any manufacturer has established the rig/speaker demo as optimally as may be expected.
Yes, Mono Biamp Mode is nice; the Cambridge Audio Azur 840W amps I had also benefitted from the Mono Biamp mode; comes in handy. :)