One channel. Sixteen speakers. No transformers.
Vyper and several other passive K-array elements let you select impedance — 16Ω or 64Ω. At 64Ω you can hang sixteen of them on a single 4Ω amplifier channel, which means a full distributed zone with no transformer anywhere in the signal path. This is the least discussed feature in the catalog and it is the one that changes a bill of materials.
70-volt distribution exists for a real reason and it solved a real problem: long runs, easy per-tap level setting, and a wiring topology any apprentice can extend. When you go 64Ω you are trading that convenience for fidelity and simplicity.
Specifically: you lose the per-speaker tap. Levels within a channel are now set by driver sensitivity and placement, not by a screwdriver on a transformer. If the client is going to want the corner banquette two dB down from the bar, that's a DSP zone and therefore an amplifier channel — so budget the Kommander by zones you'll want to trim, not by the raw speaker count.
You also need to respect cable resistance on long low-impedance runs. At 64Ω the current is low and this is far less punishing than a 4Ω run, but it isn't zero. Do the math on anything past a couple hundred feet.