SKN: SSD1800 ... The Renkus Heinz SSD1800 High Frequency Driver & Replacement Diaphragm are both no longer available. We suggest to replace these drivers with the Eminence PSD2002 bolt-on drivers. EM101 if you need 8 ohm, or EM101-16 if you need 16 ohm. Please contact us if you have any questions.