[ctuna]

Never have seen that document before in the 7 years I have been
a member here . Maybe because this is the e90 stereo sub forum .
Hi Fi option adds an extra center channel so did you have to add wiring
for that in an e90 . Its still at 25 watt per channel for everything but
the floors. I will add that document to the list.

But since the amp in the e70 is rated at 25 watts for a 4 ohm speaker
and the e90 has 2 ohm door speakers you have doubled the door power
now this makes sense and I could see why you would say it makes
a difference . (well maybe in the 40 to 50 watt range)