Solid disagreement with most comments here. It's the amps. Did not read this closely at first. You have 2 12-inch woofers in each speaker. You need power and a lot. Pass amp seems well low. Better with the AudioResearch and the Luxman, but stilll clearly low. I have single 12-inch in each speaker and have over 500 W/ch available for peaks. Years ago I was at a live outdoor concert in Madison, WI and I asked about all the amps. He said usually not running that much power but need power for the peaks. Mine are not full range like yours so did add a sub which also eases the workload on the speakers. But yours are full range, subs are not needed. While could be the room, more likely you need power. Perhaps a Parasound or Bryston would work or if you could biamp, putting a sweet amp like Pass on top and a class AB or ClassD (ICE) on the bottom. Maybe buy where can get a trial period. But to me, this is clear, you need power, likely minimum 200W/ch, more likely 300W/ch. Again, this has to do with peak requirements, not likely hitting this most of the time. Highly likely these speakers can handle this much power but should always check the specs. Mine can handle like a 200W/ch continuous. Again, usually not doing this much power, though. If your speakers cannot handle this which is unlikely, then would have to get powered subs to get the bass you want. But again, yours are full range speakers, so I think you need lot of power to drive the 4 large woofers.
One last note: amp not just reserves for peaks, but need high damping factor and slew rate, so amp can respond fast. Mine speakers are acoustic suspension; ported is easier to drive.