Can the sony xplod 1000watt amp be bridged for more power to just one sub? also what problem would cause a subwoofer to make a slight burp noise whenever the car is shut off or into the non accessory position with the car key in the ignition?

That burping noise may in fact be down to the sound leads from the head unit to the amp being slightly (about 0.5 mm) loose on the connection. Try cleaning the connections and push them on good. They sometimes come loose over time or when your fiddling with the wires sliding the head unit in! If that doesn't solve it check the earth lead as if it's not in direct contact with metal or loosely fitted, it will cause feedback to some form. My subs moved when I closed the doors for example!

Hello,
This amplifier can only be bridged for a single subwoofer with an output rating of 380 watts bridged. The amp is not rated for 1000 watts.
The burping noise you here is the electronic switch discharging power off on the large capacitor that are used in high performance amplifiers. Regards, rcampsr