Can someone explain this to me please

[oublie]

"My next concern was aperture. My cabinet design used Thiele-Small parameters to predict optimal aperture. Aperture (Sa) for the FA124 was 65.4 in2. Optimal volume was also derived from Thiele-Small parameters. For the Pyle FA124, volume (Ve ) was 19,996 in3. These three – length, volume and aperture – are the most important cabinet dimensions.
Aperture times length was a smaller volume than the 19,996 in3 needed. Aperture was independent of driver area and was independent of length and volume. For these design criteria to come together the cross-section was larger than aperture. Schematically, the side view of the test cylinder appears in Figure 1. Dimensions are inner measurements. In Photo 1, you can see my cylindrical test model had a rectangular cross-section. I had two test models; the other was conical. Length, volume and aperture were the same for both. Taper of the conical system was not arbitrary. The ratio of base area (Sb) and top area (So) was 2.54 for my test model. Figure 2 is the side view for the cone."

Ths is an excerpt from the following page discussing the relationship of horn aperature to the overall length of the horn and the vas of the drive.

Exolinear Design

does this mean there is a distinct relationship that should be followed?

secondly would a horn aperature half the size of a speaker's sd be a bad and idea? An i right in saying that the 'compression' or ratio of mouth size to speaker sd shouldnt be less than 0.5 with a 15" driver i.e 2:1 ratio in an inverted horn?

basically i'm trying to figure out if a high qts speaker can work in an offset driver alignment to bring up the the response below fs.

[NEO Dan]

Horn is a misnomer, more like mltl qw... blah blah blah

[Ron E]

Originally Posted by oublie

basically i'm trying to figure out if a high qts speaker can work in an offset driver alignment to bring up the the response below fs.

I think that whoever wrote that article was in an altered state of consciousness. There are modern methods for analyzing these types of enclosures. Martin King's sheets and HornResp are two of them that you may find more fruitful.

[NEO Dan]

I'm in agreement with Ron here. Sorry my post was not more helpful, why don't you post the specs for the driver so we can have a look? Looks like it could be simmed as a mass-loaded BLH.