What is your opinion of single driver speakers

I had the exact question.  I would love to hear them.  Have you seen "Real World Audio" youtube?  Check out Janos who talks a lot about Voight Pipe speakers which are single driver.  Pearl offers a 30 day in house trial but you have to pay for the return trip shipping.  If you are close to Indiana I would split that cost to hear them!

Best 
JH

I’ve had Pearl speakers for over 6 months and was surprised by the clarity and amazing soundstage detail of these "point source" speakers. I find the "realism" and detailed soundstage quite amazing compared to any of the many speakers (most far more expensive) that I have had over the years... The terrific base quality is also noteworthy. I highly recommend them. But not for very large rooms or front row rock concert sound levels. I'm in the San Jose area if anyone wants to hear them just PM me.

One sided

Single driver speakers can be quite nice in the right conditions.  Think small monitor speakers.  Can't expect room shuddering bass or loud listening.  But they typically have GREAT TIMING and IMAGING.  Good dynamics.  BEST in nearfield / small room or nearfield far from room boundaries.  Cone breakup can be problematic in some drivers.

I have tried several systems using Mark Audio drivers in Pensil enclosures and CSS drivers in other arrangements.