Mr. abtenet
I sent a question to the amp. maker about the DF. I’m waiting for its answer.
Connecting amplifiers in mono bridge mode is not such a good idea. Even thou your https://www.audioartistry.com/products_dvorak_specs.htm do not specify a spec for impedance as a speaker, only per unit. The bottom value is 3.2 ohm min. at 2.1 kHz.
When a load is driven by a bridge configuration, you gain a 4x power but the load on the amp. is 2x harder. The 3.2 ohm becomes 1.6 ohm!
If you use multiple amplification and mono, with XLR inputs, why 8’ long? Can’t you place the amp’s next to the speakers and get them way shorter? That might save you big time.
From the klass (class) and the AUDI, I assume you are from Germany. Am I right?