Lol,yeah I saw more than 2 dozen designs/drawings over there
However they post the hornesp SPL graphs and looks ok, are those fake?or what?
Anyway I am eager to try Brian box,
With 4 of those you think I can hit close to 140db? Or at least 136
I don't have the skillz to modify Brian eminence driver box to stick the skar ddx12 inside, I already tried with the current dimensions and the sim sux for the skar, so I will use the eminence driver Brian designed the box for.
Not a realistic listening situation, nature of the unwanted HF coming out the terminus will have to have passed thru differeing number of high-pass filters.
In a horn with little or no damping the nature is important, in a TL with damping to kill the ripple not so much.
dave
Eh! a bit more stuffing and setting path length difference, looks OK to me.
In the future please export your HR file for others to import if you want a critique. 😉
Let me finish the holidays I will UL the txt file, I just typed in the skar parameters in to Brian design.
So I don't do any mod or designing
I don't eff know how lol.
I just learned how to try different drivers in to an existing setup .
No need, I copied it, tweaked it a bit and uploaded the file for ya'll to import/view/mod/whatever, so use the File/Import option to put in the Import Folder and then open it and it will pop up as a new file.
Attached response plot, biggest problem is it only can handle 40 W down low.
Attached response plot, biggest problem is it only can handle 40 W down low.
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Just look at the discontinuity and the details about freqs in that area shown by horn response in a variety of screens and look at a variety of ways in which you could sim that and describe it otherwise(long path vs exit vs short path, that will show more of the same and you will quickly conclude. There are absolutely positively things to be concerned with that they like to dismiss and it is not fun to be spending that much time and energy and building a cabinet only to have someone tell you that weird things you’re hearing do /don’t exist.
Scott Hinson can much better describe what they refuse to explore or entertain if constructively critiqued by (us) people who build them and are left tweaking things to fix that intersting area that can be remedied or resolved by a better (simpler) design That’s actually 3:1 it seems (???) I do t understand and gave up on paraflex and the group of confused parrots🥲
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Look at your TS parameter vs mine(I have 6 of the ddx12 and kind of averaged the measurements with JR van sickles and jose Ramos‘ as well.. and use the one in my HR sim for a ‘roar’
😝 I’ve been leery of using a lot of car, audio drivers in many enclosures because the tight VAS (and/or higher Qts) produces a frequency response that is horribly ringing at every quarter wave resonance (or odd harmonic interval of concern(3 and 5). But when these guys are also playing with different drivers and damping out those peaks with open cell foam, and or poly fill, you realize that there is truly a way to incorporate many drivers into these that you would not necessarily use in many cases???
’big TL’ is a great experiment
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With the Skar? Not a chance, it only handles 40 W down low, so historically prosound was tuned 1.56x Fs = ~52 Hz, so shorten it and now it can handle 100 W, but this only gets you 110 Hz/40 Hz/2pi, so need (8) in series/parallel for 130 dB/40 Hz/2pi.
If you don't want to bother to run the sim yourself for the OP design, use the easy math:
Doubling cabinets and power=+6dB (+3dB for sensitivity gain, +3dB for doubling power).
One to two, +6dB, two to four, +6dB.
120+6+6=132 dB.
So for +6dB more, 8 cabinets!! To reach 140.
What I like is the modular approach.
2 cabinets or even 4 for inside gigs
8 for outside gigs
And it is easily transportable and movable
Like Lego pieces 🙂
Ok so I guess the cut sheet comes next
Hope I can start the prototype before January 2023 ends.
And take some 2pi measurements
I have an old Behringer ecm8000 mic that idk if can still be used and a Dbx that came with a driverack pa, a Behringer uphoria interface
I need to DL REW and start fiddling with it.
There is no way to calibrate the mics and I do not have the device to calibrate the SPL, but at least it will give us a relative freq response not SPL accurate .
Every doubling of cabinets gives 3dB (ignoring amplifier power), so 6dB requires 4 x as many cabinets.
dave
120+6+6+6=138 dB for eight, assuming each 4 ohm driver sees 40volts.
5.67 cubic feet of volume per cabinet x8=45.36 cubic feet.
If your transportation and venues require lifting the cabinets, smaller cabinets may be preferable.
If not, rolling fewer large cabinets is easier and has less net weight.
A pair of XOC1 TH18 or Keystone TH subs use less overall volume, go lower, weigh less and would have about half the driver cost with similar output to eight of Brian's offset TL, though the TL could arguably sound better.
Art
Yeah, if you want to get to 130 dB cleanly, don't start with 12" drivers. Like R-Rated movies, that's for 18 and over.
BTW, theoretically this design can be easily modified for a 15 or even 18 inch driver. Just increase the width. Would be kind of silly these days to tune an enclosure with an 18" driver to 40 Hz though ...
BTW, theoretically this design can be easily modified for a 15 or even 18 inch driver. Just increase the width. Would be kind of silly these days to tune an enclosure with an 18" driver to 40 Hz though ...
Geezz, so many options, does the eminence 18 will make a good match increasing the width
I'm looking at this one
https://usspeaker.com/Eminence FSW4018-8-1.htm