Dear colleagues! Since the sound of the P300 is not enough for me or I am of the opinion that the sound of the Velar should correspond to the optics I am superior to a sogen. Active sound system allow. There are numerous providers here. Also Arden now offers systems for diesel and gasoline. E.g.: Sound Videoshttps://www.youtube.com/watch?v=eBmjNHYpCi4https://www.youtube.com/watch?v=rz7oPgkciJs What do you think about it or have someone already installed such a system and if yes what provider? Is there any experience on this topic? LG from Austria