What is your opinion of single driver speakers

I've heard only a few truly single driver speakers whose overall performance was pretty good with all types of music.  One is the Charney Companion speaker with the AER driver, the other is a Voxativ speaker.  I also recently heard a Songer single driver system that sounded very good, but, I did not hear them enough to decide whether the Songer single driver or Songer full-range with woofer model was better (amazingly, they are the same price). 

But, I've heard many truly excellent systems that used full-range drivers in multiway systems.  I recently heard a Voxativ two-way that sounded really good, I like the Cube Audio Nenuphar Basis (10" full-range plus a built in subwoofer), and I like the bid Dolce Vita system with an 8" full-range driver plus a tweeter.  I've heard a few custom-made systems that also ultize a full range driver with a tweeter or woofer, and liked them too.  

I have not heard the Sibelius but I did own a few single driver speakers, mainly using Lowther drivers. I think Bache's design of using a modified single driver to cover the range from 500 - 8,000hz, augmented by a super tweeter and woofers is a better way. The crossover is a cap for the tweeter and a coil for the woofers. The midrange has directly connected to the amps.  It's more balanced than when I was using a Rel subwoofer with a pair of Rethms.

Single driver speakers can sound amazing.  For example filed coils to me are exceptional. Matching to the right amp also helps.  845, 45, tubes amps and some 1 watt amps make such speakers sound amazing.  Uping the price the horning speakers are also a consideration if you got the scratch.

Happy Listening.

What are you thinking of driving the Pearls with?

I am not familiar with PA but have used the Audience 1+1 for years. Single driver speakers eliminate one of the most vexing problem that designers encounter when putting a system together: the crossover network. Passive network are almost impossible to get right on a budget. Without the crossover and with the right driver, the midrange purity can be addicting in a single driver system. But like everything else in life, you can’t get it all.  The bass might need help depending on your music preference. Your might need to add subs if you want it all.