Thank you for your quick and helpful answer!
You're right about the notch at 120hz. I always like to smooth the measurements a bit because it gives a good feeling.
A less smoothed image of the measurement from listening position without EQ shows clearly what you predicted:
So, generally this notches would disappear with flanking subs for the upper midbass and lower midrange whereas more distant multisubs can smooth out below 100hz?
So... Adding 4 subs.
Do these subs have to be big and is the position of the distant subs crucial?
The Audyssey EQ flattens/lowers the frequencies from 100hz to 300hz (which caused somewhat a muddy bass IMHO). This lowered frequencies already made a much better image in de midrange bass.
Can flanking subs/distant subs solve this acoustic problem around 200hz too or is EQ here the only cure?
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