How would you describe the sound of the Spendors compared to the PSB?
To me, I preferred the Spendors over the PSB's - they sounded more full bodied yet the slight upper bass coloration I did hear did not affect their accuracy. Very resolving speaker. I also was at a dealer where I had more control over the music played and they were driven with electronics more to my liking. The PSB's were heard in a suite at Axpona with NAD gear that I also think was digital.
About the Olympicas, I have read a number of threads that stated they do not go a deep. For the price that one pays for these loudspeakers, I would hope they would go much deeper. They are rated as 40Hz and that is what my current speakers rated. I am sure the quality of Sonus 40Hz is much better than my loudspeaker 40Hz. I will try to audition them.
Another more controlled audition at a dealer, with my own music and ss electronics. I found no faults with the bass and I thought the Olympica III's were rated to 35 Hz? Sure sounded like they were to me. And yes being a true 3 way, even 40 Hz bass from these would sound quite different crossed over to a dedicated midrange driver. They impressed me the most but unfortunately out of my price range
But this is a classic case of why one must hear all speakers on their short list if possible. We all hear and perceive what we hear differently. And preferably we can hear these speakers in our own home with our own electronics. There are simply too many variables when heard at a dealer or a show. But even these types of auditions are better than none at all. Good luck to you in your search.