I've used my Rel Stadium 3 with the P10s (just for fun, I bought the Rel for use with other speakers) but the unadulterated Piega bass is far superior. Sounds like a room/placement problem to me. I assume you've already attenuated the bass using the switch at the rear of the speaker. That pretty much did it for me in my room. But I use my P10s nearfield, so the wall doesn't reinforce the bass. Try Aurios, Stillpoints, Sistrum platform or other resonance control devices under the speakers to tighten bass and focus image (good advice for any speaker, IMO).
If these things don't work, and if you're committed to the Piega's, look into your electronics to solve the problem. Amps with high damping factor (my Belles 350 monos are a good example) can really put an iron fist on the bass.
If these things don't work, and if you're committed to the Piega's, look into your electronics to solve the problem. Amps with high damping factor (my Belles 350 monos are a good example) can really put an iron fist on the bass.