hmm interesting. Agree could be needed if MS-8 isn't present. As per JBL website they claim to do time alignment, see here
And if that werenít enough for a great sounding system already, the MS-8ís DSP takes the measurement input and applies and advanced time correction algorithm. By applying this time correction, the MS-8 ensures that sound from all speakers will hit your ears simultaneously. This greatly improves the systemís imaging, clarity and realism.
535d LCI, Xenon Adaptive Headlights, ACC 2 (Stop and Go), Lane Departure Warning
Retrofits M5 heated/lumbar/memory and active backrest adjustment seats, rear heated and folding g seats, SAT Shifter, paddles (SA2TB), HUD, Rear blinds, Electric steering column, SA430 Folding and EC Mirrors, High Beam Assist, CIC, COMBOX Telematics, DVB-T TV, JBL MS-8, JL HD900/5 + HD600/4, Morel HO II, Morel Integra XO, JL 12W6v2 and Jehnert in Audio.