Here are the specs for the amps
Frequency response-10Hz-150 Hz (-3db)
power output-150W 8ohms 200W 4ohms
controls- level, phase, crossover
Here are the specs for the passive subs
Frequency response-15HZ-150Hz
impedance-8 ohms nominal
dimensions-w/o spikes-14.5" X 14.5" X 5.5 H (with spikes 7"High)
Hope this helps I just wrote down what is in the manual.
These are NOT your typical subs that have big drivers and lots of power, if you would,please go to the TBI website and read about this remarkable design.
Thanks, Randy