Originally Posted by Mfusick
It's not much gamble... The designer knows what he is doing and the parts are well known. You could look at other DIY group products using the same tweeter and horn and have a good idea about the mid and top end....
I would trust the designer matched the directivity at the XO best he could... Probably pretty good for the horizontal but I would suspect the vertical was a bit wacky at or below XO.... But I am nitpicking based on theory...
They are cheap enough, buy it and try it!
Yes, that makes a single 88 Special to explore the SEOS approach more a fun adventure than a gamble. There is an axial graph for the Fusion-15 that we can presume is horizontal. By the looks of the SEOS waveguide, it's a good guess that its vertical dispersion is considerably narrower...but that's a good thing.
Since we don't know the intervals of each curve, we can't tell too much from the graph. If it's 15 degree intervals, it's one thing. If the intervals are 5 degrees, it's something else. The designer appears to have added a bit of warmth in the 100Hz to 200Hz, but I don't think that the Fusion-12 Tempest has this. If I remember correctly, it is pretty linear through that region, and I bet the 88 is, too.
It would be nice to have the kind of detail we see in the included graph for a JBL speaker, but I understand that this is small business DIY, not a big manufacturer. http://www.manualslib.com/manual/793...2c.html#manual
A total Sound Power and a directivity index graph would be useful.
I also just realized that the Klipsch Heresy III is not terribly unlike the Fusion-12 Tempest, although a sealed 3-way design.