i love the RE8's but their rms is only 175, but Im running 2 off a pg xenon 400.1 ...425 watts, or 212.5watts each...they can be run with 250rms each. or so im told...they hit plenty loud....back when I had a 300 watt amp , I hit 131dbs@40hz on the dash, and 133.3 dbs@49hz on the kick....gonna enter a comp tomorrow to see what they hit with the PG