Originally Posted by
SteveCallas
....here is something I was pondering last night and tested this morning. When off axis from a tweeter, the top end rolls off a little bit - the further off axis, the steeper the rolloff. Very generically, most tweeters will be a few dbs down from 10-20khz when measured from 15 degress off axis. If one wants to preserve the natural FR of the top end, they will want to use enough toe in so that the face of each speaker is pointed at their ears. In doing this however, width of soundstage is typically diminished. If a speaker were to have a natural FR with a rising top end, little to no toe in could be used, making the FR at the seat relatively flat, and providing a much wider soundstage.... So what I'm thinking - and will put into practice if I ever delve into diy speakers - is to purposefully aim for a boosted top end, allowing me to use little to no toe in while maintaining flat response and achieveing a very wide soundstage. Jon will also be testing this out, as he can adjust a resistor value to increase the top end of his Modula MTs. All the listening we did so far was with a pretty fair amount of toe in - he's gonna boost the top end and use no toe in.
What do you think of that concept Dave? Not from the viewpoint of putting it into a commercial speaker you are selling and have no control over how the end user (your customers) will position them in room, but as an intentional design aspect to be used with little to no toe in.