Golf club vibration dampening and sound attenuation system

A golf club head comprising:

• a front wall including a rearwardly sloped front strike side and a rear side, the rear side having an upper region and a lower region which are generally coplanar with respect to each other;
• a sole portion rearwardly extending from a lower region of the rear side, the sole portion having a lower surface that is substantially entirely continuous, the sole portion including an upwardly extending rear wall having a forwardly facing inner surface, the rear side and the sole portion defining a forwardly extending cavity, the lower region of the rear side of the front wall and the sole portion, including the rear wall, defining a recess, the recess interconnected with the cavity and downwardly extending into the sole portion, the recess being open in an upward direction and having variable rearward depth, the forwardly facing inner surface of the rear wall being substantially non-parallel, and rearwardly sloped with respect, to the lower region of the rear side of the front wall such that the rearward depth of recess is greatest at its upper open end;
• a first insert;
• and
• a second insert contacting the first insert, the first and second inserts positioned only in, and collectively substantially filling, the recess, at least one of the first and second inserts attached to at least one of the sole portion and the lower region of the rear side, the first and second inserts made of first and second elastomeric materials, respectively.

A golf club head comprising:

• a front wall including a rearwardly sloped front strike side and a rear side, the rear side having an upper region and a lower region which are generally coplanar with respect to each other, the lower region of the rear side being substantially parallel to the front strike side;
• a sole portion rearwardly extending from the lower region of the rear side, the sole portion including an upwardly extending rear wall having a forwardly facing inner surface, the rear side defining a forwardly extending cavity, the lower region of the rear side of the front wall, the forwardly facing inner surface of the rear wall of the sole portion and the sole portion defining a non-through sole portion recess, the recess interconnected with the cavity and being open only in an upward direction, the forwardly facing inner surface of the rear wall being substantially non-parallel, and rearwardly sloped with respect, to the lower region of the rear side of the front wall;
• and
• a resilient insert assembly positioned in and substantially filling the recess, the insert assembly coupled to at least one of the sole portion and the lower region of the rear side, the upper region of the rear side be generally uncovered.