Pure Audio Project open baffle speakers

I agree with Ozzy regarding the quality of bass from the Spatial X series.  I have the X5 which has the powered 12 inch woofer rather than the 15 inch powered woofer of the X3.  My room is a difficult room for bass as it is only 11 feet wide by 24 feet long and has 7 foot ceilings.  I have several bass traps which helped my previous two rel subs but still the bass was never as tight as I would have liked.
The bass quality is much much better with the Spatial X5s and my intention prior to purchasing the X5s was to still use the two rel subs but just cross them lower.

I have mine 50 inches from the front wall and almost 8 feet apart and toed in to almost point at my ears and I sit about 10 feet apart.  I prefer 10 feet away than 8 feet away, the drivers seem to integrate better but I only have about 40 hours on them so I know they will improve with break in.

However I was shocked at the bass quantity and quality and have removed the rels as they do not benefit the bass and actually subtract from the bass quality compared to the X5s alone.

If I had a larger room I would have gone with the X3 but Clayton recommended the X5 for my room and I also thought I would still use the subs but they are now in storage.  
The reproduction of the bass guitar on these speakers is outstanding with very good pitch definition and the speakers go down into the upper 20s according to my test cd.

Yes Ozzy that's what I've heard from many owners which is hard to believe as the bass is already quite good and much better than what I had previously.  It's difficult for me to play them continuously since my family doesn't like it unfortunately.  Anyway I'll try to get more hours on them and look forward to the improvements as well.
I've heard the 100 hour point is significant and that they continually improve as you've mentioned beyond that as well.