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.
X5 40d M Sports - Fully loaded, 7 seats.
Sold 535d LCI, Xenon Adaptive Headlights, ACC 2 (Stop and Go), LDW/TLC
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.