Design of 2x18 Front Loaded Horn

Wondering if anyone has researched this? I'm favouring an approach that allows top loading of drivers i.e WSX style, to allow easy driver access and effective use of Alu heatsink plate.

Edited by levyte357 - 30 October 2007 at 2:43pm

Even Rog says that if you want to go low with an 18" it needs to be the size of a small car

Disco Stu wrote: Even Rog says that if you want to go low with an 18" it needs to be the size of a small car   Its a futile process if anything, must you use 18"s? There are more drawbacks than benefits in this day and age with such advanced driver technology. A 15" on a horn long enough to load to 35Hz can be acheived in a box 48"x24"x24" why would you go bigger?   No-one is using 18"s on long horns, why? Cones cant take it, people (even rog) are only using them on short horns and notice that most of Voids catalogue this year (Arcline, Waveform etc.) are using 12" horns.   Stu

MSE-118 'Quake' Subwoofer

Type		Large format low-frequency
Configuration		1 x 18" (457mm) LF driver
Frequency range (single enclosure)		35Hz - 200Hz (±3dB)
Frequency range (quad stack)		27Hz - 200Hz (±3dB)
Power rating		800W RMS, 1600W program
Maximum SPL (single enclosure)		134dB cont., 140dB peak
Maximum SPL (quad stack)		142dB cont., 148dB peak
Impedance		8Ω (nominal)
Weight (net)		109kg
Dimensions (HxWxD, mm)		1200x574x950 (excuding castors)
Construction		CNC machined 18mm multi-laminate Finnish birch ply
Finish		Black semi-matt textured paint (colours optional)

Quake is a powerful horn-loaded subwoofer, designed for a variety of uses ranging from large-scale live FOH and sidefills through theatre, corporate and A/V work to the world's most demanding nightclub environments.


http://www.emacoustics.co.uk/index.php?option=com_content&task=view&id=24&Itemid=99999999

Mike Severloh wrote: How bout straight horns like the ol´ Community Boxer 2x18" in trapezoidal box with and big additional reflex chamber hooked sideways where the access panel could be ? Modular,yet still stand-alone ?

Not being an expert, I have chosen the WSX or SL36 Horns to tamper with. I think it is just within my capabilities to arrive at a working solution based on one of these.

Disco Stu wrote: Hohoho nice try levyte

Yes Stu, large heavy, but still very well known and effective.. Also the driver is custom PD.

The whole point of my exercise is just to explore exactly what kind of SPL/response can be garnered from  a 2x driver front loaded horn sub on an approximately 7.5ft horn.




Edited by levyte357 - 29 October 2007 at 10:07pm

18s tend to have larger displacement than 12s,  even the caire 12sw wich has a very large displacement for a 12 can be outdone by most decent 18s and almost doubled by some beasts.  using 12s tends to lead the design of a long path horn to a higher compression ratio / smaller rear chamber wich puts more pressure on the cone with a 12,   yes its harder to keep an 18" cone rigid but they dont tend to have to travel as far and the load is spread over an area twice the size of a 12.   

The are advantages of 18s over 12s and plenty of drivers out there can take horn loading, and plenty of pro manufacturers use 18s in horns. 

Id favior the spiral folding style as it has no 180 degree bends but horns like the wsx would be easer to heatsink.