brazybrew88
10+ year member
Junior Member
on the cone of a cerwin vega stroker d2 there is an alan wrench screw is that for ajusting something
Stroker PRO Coil Bias Feature
Right out of the box, the Stroker Pro is set with the voice coil in the center of the magnetic gap, giving you a high power highexcursion woofer with the lowest possible distortion and maximum fidelity. By using the tool included with the woofer you can push, or bias, the coil’s rest position forward in the gap.
This creates asymmetrical system non linearities. These non linearities create uneven magnetic force and compliance on the forward and backward stroke of the speaker. This allows the speaker to create higher amounts of even ordered distortion (2nd, 4th, etc.) which contributes to the overall output giving the dB competition users an added edge.
The even ordered distortion also enhances the psychoacoustic phenomena known as, “The Missing Fundamental” that enhances the perception of deep bass level.
From CV (the new stroker Pro uses a similar bias adjustment system):