In reply to:

They had been out in the delivery truck on a day when it was 40 below wind chills.

Did that once with a set of bro's poly-cone 6x9s. He didn't turn down his car stereo before parking it... I got in to start it and move it on a cojone-numbing -35C morning and heard an awful crack. He was less than impressed.

Bren R.