So I'm wondering what type of impedance and configuration would be the most efficient in the following setup. I have (2) 4 ohm 10" svc (single voice coil) subwoofers with 300w rms. The amplifier can either set these up bridged @ 4 ohms 250w each or @ 2 ohms 250w each. My question is which setup would be most efficient, and if you could post a link to the configuration (picture) that would be awesome. Thanks.