Why are the Infinity IRS, Reference 1b, Beta ect speakers passive on the mids and highs?

Why are the Infinity IRS, Reference 1b, Beta ect speakers passive on the mids and highs?

I think they found as I did. (with both ways bi-amped)
I found good passive 18db xovers on the upper bass/ mids and highs of my Martin Logan ESL Monoliths III sounds more natural than any active crossover I tried, they all had a sterility to sound.
But on the 12" bass 150hz down I use and my own 24db active.

Cheers George

My favorite speakers of all time....I remember them fondly.

I don't think adding another amp would be too much in cost or space but it might be that the sound is actually better passive. Has anyone compared both ways all other factors being equal?
Marc

partroysound

I don't think adding another amp would be too much in cost or space ...

Well then, why not give it a try and report back to us?

Actually I am tri amped . what I don't have is the passive crossover. I wish I did and I would be able to tell.
Marc