[tisme]

I hope the HK is comparable to the Individual Sound System on my e90.

9 channels, 13 loudspeakers
• 1 mid-range loudspeaker, middle, 100 mm
• 2 treble loudspeakers, front 26 mm
• 2 mid-range loudspeakers, front 100 mm
• 2 bass loudspeakers, 217 mm
• 2 mid-range loudspeakers, rear door, 100 mm
• 2 mid-range loudspeakers, rear shelf, 100 mm
• 2 treble loudspeakers, rear shelf, 26 mm

Intermediate has this:

6 channels
10 loudspeakers
• 2 treble loudspeakers, front 26 mm
• 2 mid-range loudspeakers, front 100 mm
• 2 bass loudspeakers, 217 mm
• 2 mid-range loudspeakers, rear, 100 mm
• 2 treble loudspeakers, rear 26 mm

And bog-standard e90 is

4 channels
6 loudspeakers
• 2 mid-range loudspeakers, front 100 mm
• 2 mid-range loudspeakers, rear, 100 mm
• 2 bass loudspeakers, 160 mm