Not a whole lot arguing tbac is the most quiet. They just like them because they work, are “accurate”, sound good, etc.
Even tbac admits in their own testing the U7 isn’t as quiet as competitors. It doesn’t matter. Their crowd of folks have brand loyalty to the product (for good reason). They are solid. Work. Have limited issues.
They are no longer the gold standard in suppression though (even they admit it and it doesn’t matter).
EVEN IF Airlocks testing is off and the U7 (during the summit) is somehow 4db quieter than the ZG30….. the ZG is still shorter and lighter, etc. It’s still impressive for what it is (and nearly 50% cheaper btw).
I don’t think we will see that. It will be equal to if not less if I were a betting man.