How are the four Celestion G12M-25 (25W, 16Ω) speakers wired ― series or parallel ― inside the 1960AX and 1960BX extension speaker cabinets?

How are the four custom speakers (8Ω, 50W) wired ― series or parallel ― inside the CODE™ CODE412 extension speaker cabinet?

How are the two custom speakers (4Ω, 50W) wired ― series or parallel ― inside the CODE™ CODE212 extension speaker cabinet?