Hello all, I was browsing the internet today, looking for some cabinet designs for a pair of wizzer full range drivers I have and came across some odd looking cabinet designs for lowthers, some looked to be a combination of back loaded horn cabs and transmission lines all in one, and some looked like the driver was placed halfway or 1/3 down a t-line or horn with two open ends, along with the driver itself radiating sound into the room, and one even had the t-line leading to a sealed cabinet kind of "room" in the box. I know there has been a little effort in learning the characteristics of more exotic speaker designs like the combination reflex/front-horn/chambered graham holliman infrasound subwoofer but it's hard to find any info on these designs, most of what I've found is about vintage hifi systems with little explanation of the manufacturers success with their design. The website I was looking at most recently was LOWTHER KLUB - projekty
The one labeled ACCOLADE 4 seems like it would get very complicated in the many ways the drivers interact with each other and the room itself, with all those pathways between them. The BICOR 200 seemed like a double ended t-line/back-horn. The FIDELIO MK II seems to make sense at first, being like a voigt pipe, but then a closer look makes me think that there's a space toward the top of the cab that can transfer sound as well and the same with the OPUS One B, seems like an ordinary back horn but looking towards the back, those ports seem to lead straight back to the driver. If nothing else, does anyone know anything about double open ended t-lines of any kind (voigt pipes, back horns, etc.)?
The one labeled ACCOLADE 4 seems like it would get very complicated in the many ways the drivers interact with each other and the room itself, with all those pathways between them. The BICOR 200 seemed like a double ended t-line/back-horn. The FIDELIO MK II seems to make sense at first, being like a voigt pipe, but then a closer look makes me think that there's a space toward the top of the cab that can transfer sound as well and the same with the OPUS One B, seems like an ordinary back horn but looking towards the back, those ports seem to lead straight back to the driver. If nothing else, does anyone know anything about double open ended t-lines of any kind (voigt pipes, back horns, etc.)?
On the topic of more exotic designs of t-lines, I know of two ways of reducign the peaks in the freq response of t lines, one is by tuning to the proper length and adding an extra section tuned to the dip in response to even it out, the other is to place the driver either 1/3 or 1/4 the way down the t-line, I've heard that adding a separate part to the t-line instead of moving the driver, can improve low end extension, but I'm also wondering if having that extension open vs closed has any effect on how well it works vs the volume and extension of low/low-mid tones in the speaker, depending on placement and tuning open might either fill in or cancel some of the peaks and valleys in freq responce depending upon how out of phase it is, and while I'm trying to work out an idea of how these concepts might work for different results, does anyone know of any rules of thumb on what effect these forms might have?
Currently I'm working on designing a t-line for a driver I got from MCMElectronics, cast basket with aluminum cone, and I'd like to try out a few of these kinds of designs but until I can get a hold of the plywood I'll be using I'd like to learn as much as i can about the concepts and ideas so I have a better chance of success. I know trial and error are more successful than any simulation or math but understanding better would give me and anyone else who comes along a better starting point for future projects. I also have a pair of coby full ranges with wizzer cones (got them used and no model number on speaker or driver) and decided to modify them with a mushroom style phase plug and a cabinet like the TP1 Isis or the Opus One B.
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