| Horn Designs for brand X drivers [message #40779] |
Sun, 30 March 2003 04:59  |
Bass Trouble
Messages: 4
Registered: May 2009
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Esquire |
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I am extremely interested in building some kind of front loaded horn boxes (3 of them) to increase the effieciency of my home subwoofer settup. I use 3 18" dual voice coil car subs driven with a 1400 watt amp. My spl levels are in the 120 range room loaded at 25 to 30 hz, and was told a flh would increase those numbers significantly. Specs on the drivers are as follows. spl 1w/1m-89.1, displacement-6513.3 cc's(397.4 cubic inches), mounting depth 8 1/4", revc-7.32, vc inductance,mh- 7.499, sd,sqM- .1159, bl-26.83, vas-423.17 liters (or 14.94 cubic feet), Mms,gms-372.63, fs-17.5, qms-11.942, qes-.417, qts-.403, Pmax-1000, and Xmax-14 mm. I have tried to download some horn modeling programs, and do not know what im doing, so can some one please help me design some horns that would give response down to around 20 hz with these drivers? Size is not a problem, nor is the construction of the enclosures. I have asked everyone it seems for help on designing my own "earthquake" style sub enclosures, and no one has helped anywhere else, just told me to do worksheets on different programs. I can't seem to understand all that stuff when I do get a download properly, so please help me. Thanks a lot for any and all help provided.
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| Couple of questions [message #40781 is a reply to message #40780] |
Sun, 30 March 2003 19:21  |
Bass Trouble
Messages: 4
Registered: May 2009
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Esquire |
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Okay, my computer downloaded the program succesfully (I think, it said 4 files or items unzipped, so I hope there is only 4), but I need to know for a front loaded horn, with a sealed chamber for the sub, what am I looking for? Finite or infinite horn, single tractrix, exponential flare segments, or hyperbolic-exponential, conical or tractrix, ummm lets see, for the horn flare parameters there are catenoidal,cosh,exponential, sinh, and conical. Couple other things I can't quite remember off the top of my head that I have never heard of in my life until now. I will use this program as suggested to me, but for a sub only horn settup, what is a preffered design (with a sealed enclosure for the back of the woofer) as far as all that stuff I mentioned goes? I can build any sealed, ported, or bandpass box you want, but this is more complicated than I ever imagined. I thought transmission line stuff was sophisticated!! Size is not of a concern as long as the overall height is no higher than 8 feet and no more than 44 inches wide. These will be built where they will stay in the room. I am aiming for the most spl down to at least 25 hz response at the highest spl levels possible, preffering flat or boosted response at the 25 to 30 hz frequency area. I have much to learn now, just tell me what flare style and which design I want, and maybe some tips to help me understand all this. In the mean while I will be looking up all this new lingo. I've heard the CV Earthquakes before, what design are they? Thanks again
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| Couple of answers [message #40782 is a reply to message #40781] |
Sun, 30 March 2003 20:53 |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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An infinite horn is just that - infinite. So you can't build it. Modeling it will show you what a finite horn of given shape and characteristics might approach if mouth size is sufficiently large, or if several are used in a group. Besides this, there are spatial constraints that you can model with the "ANG" field - 4π is free-space, and is what a horn will act like suspended in the air away from any boundaries. Half-space is a common configuration as it is what a single horn standing on the ground will act like. It is represented as 2π in the "ANG" field. Quarter-space is (1) π in the "ANG" field and it is the condition a horn will be in if it is against two boundaries, like on the ground and against a wall or paired with another similar horn. And eighth-space is shown as π/2 and it is what the horn will act like when placed in a corner.As for a 20Hz horn, you have a problem if you want to truly horn-load the bottom octave. It has to be huge. So before you even worry about flare shape, you might want to set some design goals. If your goal is 20Hz f3, you're stuck with only options that are very large. One of my favorite solutions is to use room corners because they form the largest horn one can possibly fit in a room. Hyperbolic or exponential expansion loads the diaphragm lower than a linear expansion for a given length, but again, the room's corner is the biggest horn you can possibly fit into a room. So it makes a lot of sense to take advantage of it.
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