I managed to burn my aq hdc312(Dvc2 At 4 ohms) copper coils after about 3 months of use with the same set up i used with a 2002 dd3512 for over 2 years. After i cut soft parts out the aq I realized that the so called "vented cross drilled extended pole piece" was not at all cross drilled. The hdc3 date of manufacture is 08/2010. Question is, was i shafted by AQ after false advertisement all am i getting it all wrong? serial on the magnet is 5001. Are there different hdc3 motors or somebody just forgot to cross drill the sucker?