In short, if you tell us your design goals we can tell you which design choices will help achieve that goal but we cant tell you how to make a design better without knowing what you are trying to do with the speaker. if you make the front baffle wider that changes the frequency of the baffle step so that it is lower (usually better) but it also makes the imaging more diffuse (worse). this same increase in size though may make it less desirable as a desk speaker because it will be too big etc. but if you then change the driver to one that can play lower you can include more of the frequency spectrum and the speaker will sound better. if the driver you are using cant take advantage of that then you will create a hole in the frequency response between where your driver can play and where your enclosure is reinforcing thus making the FR less flat (worse). for example if you want to make this design have deeper base, you can increase the size of the horn, that will move the tuning frequency of the enclosure lower. The key is to tailor your design to your needs. It is rare that you get a "free lunch" in speaker design. Horn speakers have been around a long time and as I said in my recent review of the Ferguson Hill FH-007 they are unique in their sound presentation, but. Ian Ringstead puts these 1595 standmounters through their paces for Hifi Pig. If you change the design it will probably make it better in some areas and worse in others. The Intimate Audio DS-108 back loaded horn loudspeaker is UK built and uses the four-inch Fostex FE108EZ driver. I am not sure what you mean by improving the design. I am not really sure how much squareness is detrimental in this application and if you need to absorb some high frequencies i think you can stuff it with some polyfill and that should do the trick. Back-loaded (AKA rear-loaded) horns are loudspeakers that have a horn. The chamber acts as a helmholtz resonator and is an important part of the design. This design is 60 x 6 x 8 in size, and uses a tiny little Mark Audio Alpair 6 a.
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