Hey @Bdp24
Well, not saying I don’t l9ike them, ribbon speakers have a reason why they are so low, and they have a pay-off that’s worth it.
Interesting that you bring up the Infinity speakers. Not sure about the IRS, but there were lesser models with crossover designs we’d now consider "naive" at best. You can buy crossover upgrades which maintain the tonal balance while raising up the minimum impedance.
I analyzed a pair of Focal 918 speakers and really had a tough time believing the crossover design was NOT deliberately meant to make it hard to drive. Some caps and resistors in the woofer section dropped the impedance to unnecessarily low values below 100 Hz which could easily have been avoided.
In the case of the Infinity speakers I’m thinking of, they were designed in an era when we lacked the simulation tools we have now, it could have been they got to the right sound and then didn’t want to also optimize to avoid the low impedance.