An upgrade from the four-channel 300/4v2, the 450/4v2 offers increased wattage (150w per channel versus 75w) and more channel bridging options. Whereas the 300/4v2 offers only four-channel or two-channel bridging, the Audio 450/4v2 includes channel 1&2 stereo, channel 1&2 bridged, channel 3&4 stereo, and channel 3&4 bridged. The Audio 450/4v2, however, maintains the 300/4v2’s 5Hz-30kHz frequency, as well as its >200 @ 4 ohms dampening factor. The JL Audio 450/4v2 is priced at a rather expensive $849.99, although some retailers do offer it at just $529.99.