Both systems are manufactured by Harman Kardon, and both systems feature Logic7 sound processing; however, the marketers decided to shift the branding focus from "Logic7" to "Harman Kardon". I can also confirm that there are 2 fewer speaker for the coupe in MY2011. Although there are speaker grills in the rear deck, there are no speakers in them. Total speaker count has been reduced from 13 to 11. Special shout out to the bean counters and unfavorable exchange rate.
PCD 12/21/2010: 2011 335i Coupe 6MT | Black Sapphire Metallic | Saddle Brown Dakota | Premium Pkg | M Sport Pkg | Harman Kardon | Navigation | iPod/USB | Sirius | Smartphone Integration | Heated Seats | Comfort Access