not that i know any or can add much but curious as to why you want a German company?
Deck: Pioneer EH-P4200UB
Rears: Alpine SPS609 S series
Subs: 2x M5A IXL-12 v2 BR's in a ported box
Amp: Visonik V900HC
Wiring: 4x 4AWG power runs and 4x 4AWG ground to batt + the big 3 all 4(2 runs) gauge.
Batteries:2x Stock 525 cca
143.3 Db's Uncertified.