Fosgate Audionics SD 90 Dual-Drive Home Thx Dipole Surround Speaker - manual or diagram??

[T Gunderson]

Hi, I am interested in knowing how Jim intended these speakers to be used... they have 2 inputs and appears when the switch is on THX it combines 1 & 2 and when switch is on "Dual Drive" the left or right bank of speakers are driven. Anybody explain this or have documents?