Ideally exterior dims can be as big as 39w x 11h x 25d
This matches the horizontal footprint of the sub as well as the sub's mouth. Depth wise it snugs right up to the roll bar on my truck.
This matches the horizontal footprint of the sub as well as the sub's mouth. Depth wise it snugs right up to the roll bar on my truck.
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I just realized you were talking about the sub. I upped my dims a few times (kept finding extra inches in the cargo area). Final output dimensions for the sub are 39w x 24h x 38.5d
Design build sheet
Hi Jennygirl,
An aspect ratio as in Post #201 might result in reduced horizontal dispersion. Just something else to keep in mind. The Hornresp Wavefront Simulator (F9) might be helpful to evaluate this.
Regards,
An aspect ratio as in Post #201 might result in reduced horizontal dispersion. Just something else to keep in mind. The Hornresp Wavefront Simulator (F9) might be helpful to evaluate this.
Regards,
WHOA! That is neat to watch!
How does one set the aspect ratio? Leaving it default I assume it's defaulting to a perfectly round shaped exit?
Oh I get it, you mean the aspect ratio of horn length to mouth size
How does one set the aspect ratio? Leaving it default I assume it's defaulting to a perfectly round shaped exit?
Oh I get it, you mean the aspect ratio of horn length to mouth size
A Synergy was suggested and if you go the tractrix route, I might suggest a Trynergy which is what I did with my tractrix horn. It can all be modeled in AkAbak pretty accurately.
http://www.diyaudio.com/forums/full-range/261427-presenting-trynergy-full-range-tractrix-synergy.html
http://www.diyaudio.com/forums/full-range/261427-presenting-trynergy-full-range-tractrix-synergy.html
I finally got time to start the accuracy check. All I've done so far is add up the length segments and calculate the S1 and mouth cross sectional areas from the info in post 182 and my numbers don't match yours.
Total horn length as measured by you - 352.96 cm
Total horn length as shown - 351.028
S1 csa as measured - 400 sq cm
S1 csa as shown - 1.49 x 37.5 sq in = 3.7846 x 95.25 sq cm = 360.48315 sq cm
S4 csa as measured - 2247.29 sq cm
S4 csa as shown - 9.27 x 37.5 sq in = 23.5458 x 95.25 sq cm = 2242.73745 sq cm
I assume the difference in the path length and the difference in S4 csa is due to rounding off the measurements on the diagram. The rounding error (if that's what it is) isn't ideal but seems to amount to less than 1 percent error, which is acceptable I suppose.
But I am extremely concerned with the 40 sq cm difference is S1. Did I do something wrong or should I be referencing something other than the info in post 182?
Total horn length as measured by you - 352.96 cm
Total horn length as shown - 351.028
S1 csa as measured - 400 sq cm
S1 csa as shown - 1.49 x 37.5 sq in = 3.7846 x 95.25 sq cm = 360.48315 sq cm
S4 csa as measured - 2247.29 sq cm
S4 csa as shown - 9.27 x 37.5 sq in = 23.5458 x 95.25 sq cm = 2242.73745 sq cm
I assume the difference in the path length and the difference in S4 csa is due to rounding off the measurements on the diagram. The rounding error (if that's what it is) isn't ideal but seems to amount to less than 1 percent error, which is acceptable I suppose.
But I am extremely concerned with the 40 sq cm difference is S1. Did I do something wrong or should I be referencing something other than the info in post 182?
I got the 400 S1 from measuring my CAD file, but the original sim was this
S1 should ideally be 356
S4 should ideally be 2249
Looks like your measurements after CAD came in even closer than mine. I dunno how mine were off from yours, especially with horn length
(CAD says centimeters but it's actually inches)
I'm in the process of converting everything to metric- I will post an updated build sheet when I'm done.
Thanks for going through with the doublecheck, guy!
<1% error is something I can definitely live with!
S1 should ideally be 356
S4 should ideally be 2249
Looks like your measurements after CAD came in even closer than mine. I dunno how mine were off from yours, especially with horn length
(CAD says centimeters but it's actually inches)
I'm in the process of converting everything to metric- I will post an updated build sheet when I'm done.
Thanks for going through with the doublecheck, guy!
<1% error is something I can definitely live with!
Also just got back from home depot. 3 sheets of arauco staring at me longingly awaiting their moment on the table saw! Poor little guys, they don't even know what they're in for!
Guy- are you a believer in my method with Cinema4D aided folding, yet?
Hopefully the numbers are alleviating any doubts you had. I'm glad you did have doubts though, because it made me want to go above and beyond to prove its efficacy... which lead to a higher accuracy than even I was expecting.
For anyone interested, it would be easy to package my file into an all in one interactive folding solution complete with inputs straight from hornresp. C4D itself is easy to approach.... a lot easier than most CAD software- even Sketchup in my opinion. The more advanced programming side of it is difficult, but similar to a spreadsheet program all the tough stuff goes on in the background
Hopefully the numbers are alleviating any doubts you had. I'm glad you did have doubts though, because it made me want to go above and beyond to prove its efficacy... which lead to a higher accuracy than even I was expecting.
For anyone interested, it would be easy to package my file into an all in one interactive folding solution complete with inputs straight from hornresp. C4D itself is easy to approach.... a lot easier than most CAD software- even Sketchup in my opinion. The more advanced programming side of it is difficult, but similar to a spreadsheet program all the tough stuff goes on in the background
Metric build sheet. Outer box dimensions 39"w x 24"h x 38.5"d
Updated measured hornresp input parameters, thanks guy!
Frequency response @49V w/ 27hz 48dB BW HPF. Loaded with dual 15HP1060 4ohm in parallel (1200W @ 2ohm)
1W/1m response
Updated measured hornresp input parameters, thanks guy!
Frequency response @49V w/ 27hz 48dB BW HPF. Loaded with dual 15HP1060 4ohm in parallel (1200W @ 2ohm)
1W/1m response
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I'm hoping to get into it now so I should have an opinion soon. If it turns out to be accurate it's definitely a great tool. I'm guessing it's not free software, in fact I'm a bit scared to even find out.
Yeah its expensive but there are tiers.
Using it for this is kind of hilarious because it is actually a motion graphics 3d modeling and animation program. However it does contain some very useful features that have helped me out with fabrication in numerous ways. Things that I've never seen any other program be able to do.
It is possible that something like grasshopper for rhino might be able to match C4D xpresso in the way I am using it here. And it would be perfectly accurate.
Using it for this is kind of hilarious because it is actually a motion graphics 3d modeling and animation program. However it does contain some very useful features that have helped me out with fabrication in numerous ways. Things that I've never seen any other program be able to do.
It is possible that something like grasshopper for rhino might be able to match C4D xpresso in the way I am using it here. And it would be perfectly accurate.
Sounds like a perfect project for a large scale 3d printer
I may just have one of those...
2 halves of a full range tractrix, printed out in PLA, then fiberglassed over/together sounds like a heck of a project.
Is there any way to make such a tractrix with just one driver? While very cool, these synergy style horns with gobs of drivers surrounding them doesn't really appeal to me for some reason. I can go as wide as 39".. And really I'm just looking for something to cover the 100hz - 2000hz range.
With the 3d printer aspect, the tractrix horn could actually be made with an ideal conical shape. There is no limitation of planar materials.
EDIT: Also figured I would give an update on the FS215 v2 build process. I'm having a slight issue with my circular saw that has caused me to recut a few pieces.. I think someone has been roughing the tool up (I live with many people and some do not know how to properly use the equipment). Either way I will hopefully be making some serious headway tomorrow. I'm about halfway into getting all the pieces cut.
I keep thinking of how crazy it would have been to build the v1, and how grateful I am to have listened to weltersys re-recommending the non-symmetrical route. Looking at that v1 cut sheet was daunting, and I know I will be much much happier with the drastically extended F3 I was able to achieve in v2.
Also.. metric? Why have I always insisted upon using standard units with previous builds?? Never again!
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I finished the fold accuracy check. The tl;dr version is that your method does not produce perfectly accurate results but it's not too far off the mark.
I'll post up the details tomorrow after work.
I'll post up the details tomorrow after work.
do you have any type of measurement mic? very interested in seeing the original (ventd) box spl chart vs the new (TH) box measurement, in sensitivity (since those drivers can likely take max voltage from the JL in either alignment).
One more set of comparisons before I chalk up the ventex box as a part of history...
Both graphs are with the same set of 15HP1060 drivers, both at 49V
FS215 (black) vs vented box (grey)
Re increased by 50% (hot driver)
The TH design will add nearly half an octave of lower bass extension, 3dB average acoustical power, and the best part of all: directivity.
FS215 is going to stomp the living daylights out of that vented box. I cannot wait to hear it. Long live the TH.
Both graphs are with the same set of 15HP1060 drivers, both at 49V
FS215 (black) vs vented box (grey)
Re increased by 50% (hot driver)
The TH design will add nearly half an octave of lower bass extension, 3dB average acoustical power, and the best part of all: directivity.
FS215 is going to stomp the living daylights out of that vented box. I cannot wait to hear it. Long live the TH.
Thanks for doing that guy, still can't believe how much you guys are willing to go through for me to double check my work. I never expected to have such support on this! Thank you!!
Sine- I have a simple SPL meter, will that do?
I do want to get a REW system especially because it plugs right into minidsp. That is next up on the list.
Luckily still haven't disassembled the vented box. How should I go about testing it?
EDIT: nvm, just downloaded REW... didn't realize it was free. I can probably figure it out unless you have anything specific to add, it is always appreciated 🙂
Sine- I have a simple SPL meter, will that do?
I do want to get a REW system especially because it plugs right into minidsp. That is next up on the list.
Luckily still haven't disassembled the vented box. How should I go about testing it?
EDIT: nvm, just downloaded REW... didn't realize it was free. I can probably figure it out unless you have anything specific to add, it is always appreciated 🙂
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