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Swapped out base audio underset woofers for Harman Kardon version .
Orginal plans for 8 inch replacements was for a newish driver but unfortunately too close to seat rail. Really after a good 50- 60 hz to 175 / 200 hz midbass driver with lowish QTS of around .5 - .7 to get tight midbass. Have a heavy lifting sub to cover 20 - 50hz thst delivers substantial output down to 23hz hence not considering an SWS.
Maybe the integral audio 8 inch underseat woofer might fit the role ? Pitty IA don’t publish any specs and no oppertunity to hear them down under.
Anyway, added BMW underseat male connectors to speaker wiring . These have four connector positions.
Postion 2 , Woofer —
postion 3 , Woofer ++
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