Originally Posted by kbarnes701
The articles I linked to show very clearly that speaker designers can, and do, take room modes (which are caused by reflections of course) into account when designing certain designs. Those designs are designed with nulls which are intended to minimise those same reflections.
Again, room modes are specifics of a given room, their frequencies are derived from room dimensions (W&H&D) and are not known by designers. Room modes are there even if there are no speakers in the room. Full stop.
This is very clear in the Linkwitz and hifizine articles. It isn't all that unusual - many designs are intended, for example, to be placed close to room boundaries: the designer knows that this is the likely placement for the speaker he is designing and he takes that into account when shaping the frequency response.
The design engineer doesn't know where we are going to put out speakers, nor is he concerned about it. Full stop.
Googling Roy Alllison will yield further information on that. I have even owned open baffle speaker designs myself in the past, which again were specifically designed around real-world room factors.
Real world rooms vary more than there are stars in the night sky. Full stop.
The fact that the designer doesn't know the specifics of the room the speaker will be used in isn’t a barrier to designing speakers that are intended, by their very design, to combat modes.
Not true. Speaker designers do not combat modes. It's not their job. It's your job and my job when we put the speaker in our particular rooms. Full stop.
If the designer puts drivers in an open baffle to create a dipole speaker (various members have raised questions in this thread about how Audyssey copes with such designs BTW) then when viewed from the front the drivers are pushing towards you and when viewed from the rear, the drivers are pushing away from you. The front and back waves are in opposite phase, so they will cancel where they meet and this will create a null at the side of the speaker baffle. This design combats width modes which are caused by bass reflecting off the left and right (side) walls - a very clear example of how a speaker designer can design a speaker to combat room modes, and without requiring any specific knowledge of the room in which the speakers are installed.
Not true, yet not relevant to the discussion.
There is a huge amount of information about this available on the internet in the numerous articles on speaker design.
Info is vague, the Innernet is endless.
Whether Audyssey will work effectively with such speakers is another issue of course and one which has been raised in this thread in the past.
and markrubin. Are we on topic this time? May we carry on?