Speaker having dual-coil, dual-gap, electromagnetic transducer with outward offset voice coils

A speaker comprising:

• a magnetic assembly having a first air gap and a second air gap that are spaced apart from one another along an axis;
• and
• a voice coil assembly including a bobbin having a first voice coil and a second voice coil that are spaced apart from one another along the axis, the bobbin being movable in first and second directions along the axis relative to the magnetic assembly with at least one of the voice coils being at least partially positioned respectively within at least one of the air gaps;
• and
• wherein in an axial position of the bobbin relative to the magnetic assembly a larger length of the first voice coil extends in the first direction past the first air gap than in the second direction past the first air gap and a larger length of the second voice coil extends in the second direction past the second air gap than in the first direction past the second air gap.

A dual-coil, dual-gap, electromagnetic transducer for a speaker, comprising:

• a magnetic assembly including an annular central portion and an annular sleeve portion, the sleeve portion concentrically surrounding the central portion with an air gap spacing therebetween, the central portion and the sleeve portion having a common center axis extending in an axial direction, the central portion including a first top pole piece and a first bottom pole piece, the sleeve portion including a second top pole piece and a second bottom pole piece, and the top pole pieces being opposed to form therebetween a top air gap and the bottom pole pieces being opposed to form therebetween a bottom air gap with the top air gap and the bottom air gap being spaced apart from one another along a second axis extending in the axial direction;
• a voice coil assembly including a bobbin having a top voice coil and a bottom voice coil that are spaced apart from one another along the second axis, the bobbin being movable in upwards and downwards directions along the second axis relative to the magnetic assembly with at least one of the top and bottom voice coils being at least partially positioned within at least one of the top and bottom air gaps, respectively;
• and
• wherein the top and bottom voice coils are spaced apart from one another along the second axis with an outward offset such that in a mean axial position of the bobbin relative to the magnetic assembly a larger portion of the top voice coil extends upwards above the top air gap than downwards below the top air gap and a larger portion of the bottom voice coil extends downwards below the bottom air gap than upwards above the bottom air gap.