Sony amp 325rms bridged @ 2 ohm s pushin a 300 rms 4 ohm sub , ?

I have a sony 800 watt peak amp and i bridged it on a 4 ohm powerb 12 sub, the sub has 600 max 300 rms, sony claimes the xplode amp bridged is 325 rms at 2 ohms is that to high for the sub ?? I have an alpine hu and the sub setting is +2 and the amp is 75% up . The sub blurts al low signal ??