I need help choosing an amp for two RE SE subwoofers, dvc 4 ohm, 600 w rms. Should I get a mono amp, two channel (bridged or not), or four channel (bridged for sure)? My wiring options are either 1 ohm or 4 ohms, but I will take Glass' advice on wiring to 4 ohms. Please suggest a few amps from companies with good products which will last a while. Also, can someone explain to me what thermal rating means. THANKS!