My Marantz SR8015 could actually drive them down to 20 Hz if I wanted to. But not sure I want to. I'll need to experiment with it once I get some acoustic panels installed.
Power Output (8 ohm, 20 Hz - 20 kHz, 0.08% 2ch Drive)
X-Statik specs:
System: Three way, five driver open baffle/sealed hybrid
Drivers: 1" treated fabric dome and 4x custom 6.5" curvilinear shaped treated paper cone woofers with polymer chassis
Crossover: 200Hz and 1800Hz
Frequency Response: 65 Hz to 20 KHz (± 3 dB)
Impedance: 8 Ohms nominal
Efficiency: 90.5dB (@ 1 watt / 1 meter)
Dimensions: 46.7" H x 8.5" W x 16.5" D