Dc2, there was a previous discussion of this. I had always thought as you do that the contact with direct current should be an outward push of the driver. Now I am less certain. Consider the microphone and the initial impulse of a horn. The microphone moves backward. If this electronic impulse is a positive pulse the driver would be pushed outward, but if the impulse is negative, it would pull the diaphram backward. All would depend on the microphone being hooked up out of phase. I wonder if there is any consistency to this.