These are great speakers. Don’t take my word for it though – read some reviews.
I removed the crossovers and I am bi-amping them. You can read about bi-amping here.
They are powered by two modified Charlize II class-t amps. The amps have their own AMB Sigma11 regulator and 200VA transformer each. Each amp is fed from its own active 18dB/octave 3rd order LR crossover @2250Hz which uses Mundorf silver/oil and Relcap RTE capacitors, and are powered by Sigma22 regulators and 80VA transformers. I use Neotech speaker cable, available here.