- 4" wide dispersion aluminum balance dome diaphragm. - Santoprene rubber surround. - Copper c
- 4" wide dispersion aluminum balance dome diaphragm. - Santoprene rubber surround. - Copper capped T-Pole focuses flux in gap for fast transient response. - Nickel plated machined, die-cast aluminum frame. - High energy Strontium magnets, 5-way binding post terminal.