Need suggestions on efficient book shelf speakers for a Pass Labs XA3.5

@audphile1 I actually have those benchmark-made cables where one end is rca and the other is balanced.  Do you think those would work at all?  Otherwise I might get some balanced cables and see.  

I am going to look into some of these.  Thanks for the suggestions. I think a small Rel sub would solve most of my problem but it would need to go where my hamper is lol.  It’s a small room with lots of absorption- curtains & carpeting & bed etc. That could be why it appears less loud at full-ish volume.  I just remember when I had a wadia 315 Amp (which is 150 watts) hooked up before and felt it was much louder. The pass labs sounds more heavenly of course.   

I had a 150 watt class d amp previously and remember it being much louder at an 8/10 volume (using same speakers) .  The amp is at a pleasant volume as it stands but it seems capped to my ears -volume wise. I have a Benchmark 2 Pre/Dac and a Bluesound streamer using rca interconnects.  

Thanks for those suggestions.  

What kind of sensitivity should I be targeting for this amp? What is the minimum? It’s class A - but only 30 watts.