there’s a pattern to all of this and the only way to understand it is to look at some specific enclosures that demand a certain thing and expose it.
After the fact I can find the same things nearly as good in ROAR as I can as are expressed in those others
Diluted in the series but it isn’t it just seems like that he still has the same exact rules and requirements and that’s the spacing from the start to the driver to the next fold and then all the way to the next whatever and then the next driver and then the exit and everything in between if it is not in the proper sequence it’s all garbage and more of it increasingly so from the start.
Oh that is very specific in the parallel or offset driver entry Cordaway pipe designs with everything is absolutely impossible to not screw up unless you have it in the exact location it’s supposed to be. You get a lot of information by forcing these two things together from the opposite sides and if you take that information and you use it in the roar it almost works the same way it almost gets the same results.
It’s a 360 cm pipe that she was at the easiest and the best and simplest because you’re using numbers in a circle but that’s three and 30 and 300 if you’re using speed of light in there and it doesn’t matter what anyone thinks you can ignore that part it is a facIt’s a 360 cm pipe that she was at the easiest and the best and simplest because you’re using numbers in a In a circle but you also incorporate the number three which is the speed of light and so is 30 and so is 300 so it’s whatever who cares it it’s also important to note that 1.5 and 150 do the same interval if that was a frequency as .75 or 7.5 and 750 due as well as 22.5 and 225 etc. it’s all the way for me to be likIn a circle but you also incorporate the number three which is the speed of light and so is 30 and so is 300 so it’s whatever who cares it it’s also important to note that 1.5 and 150 do the same interval if that was a frequency as .75 or 7.5 and 750 due as well as 22.5 and 225 etc. it’s all the Is associated with breaking down the number 3,30,300,,,,,,, Whatever it doesn’t matter 30° 30 cm is there a very very important things so is 300.
No one notices it and until they look at the Pythagorean theorem and they look at specific enclosuActually do something instead of just vent
After the fact I can find the same things nearly as good in ROAR as I can as are expressed in those others
Diluted in the series but it isn’t it just seems like that he still has the same exact rules and requirements and that’s the spacing from the start to the driver to the next fold and then all the way to the next whatever and then the next driver and then the exit and everything in between if it is not in the proper sequence it’s all garbage and more of it increasingly so from the start.
Oh that is very specific in the parallel or offset driver entry Cordaway pipe designs with everything is absolutely impossible to not screw up unless you have it in the exact location it’s supposed to be. You get a lot of information by forcing these two things together from the opposite sides and if you take that information and you use it in the roar it almost works the same way it almost gets the same results.
It’s a 360 cm pipe that she was at the easiest and the best and simplest because you’re using numbers in a circle but that’s three and 30 and 300 if you’re using speed of light in there and it doesn’t matter what anyone thinks you can ignore that part it is a facIt’s a 360 cm pipe that she was at the easiest and the best and simplest because you’re using numbers in a In a circle but you also incorporate the number three which is the speed of light and so is 30 and so is 300 so it’s whatever who cares it it’s also important to note that 1.5 and 150 do the same interval if that was a frequency as .75 or 7.5 and 750 due as well as 22.5 and 225 etc. it’s all the way for me to be likIn a circle but you also incorporate the number three which is the speed of light and so is 30 and so is 300 so it’s whatever who cares it it’s also important to note that 1.5 and 150 do the same interval if that was a frequency as .75 or 7.5 and 750 due as well as 22.5 and 225 etc. it’s all the Is associated with breaking down the number 3,30,300,,,,,,, Whatever it doesn’t matter 30° 30 cm is there a very very important things so is 300.
No one notices it and until they look at the Pythagorean theorem and they look at specific enclosuActually do something instead of just vent
When you cancel out frequencies or you regain them it’s important to look at where exactly what that was. More information to be used as well. You only way to understand any of them I just started the ultimate version of each I think. The ones that parallel or bounce right back at it and force something to occur no matter what and it will only occur Perfectly aligned and that’s not easy but then the numbers you get from that work all over the place do usPerfectly aligned and that’s not easy but then the numbers you get from that work all over the place Any kind of see it or feel it or whatever in raw but it’s plain sighton 360°. And you gotta break it down the right way or you’re just making a mess no matter what and it will show up more and more so it’s very ambiguous in the same because you don’t have exact locations that you do in the parallel ones that make it absolutely unmistakable
I wish there was a way to describe it it was simpler but the honest answer is about two or three sheets of graph paper and series of numbers and stuff to show the pattern it’s just gonna be pi divided by eight or eight divided by pi and then seconds in a day or 12 hours and 360° incorporated by dividing it by 12 or 24 which exposes whole Lotta stuff and unfortunately it’s not quite so obvious in the series version of it but these numbers expose himself humongously on questionably in apparel aversion and in the office aI wish there was a way to describe it it was simpler but the honest answer is about two or three sheets of graph paper and series of numbers and stuff to show the pattern it’s just gonna be pi divided by eight or eight divided by pi and then seconds in a day or 12 hours and 360° incorporated by dividing it by 12 or 24 which exposes whole Lotta stuff and unfortunately it’s not quite so obvious in the series version of it but these numbers exposed wow!!! It’s crazy / unquestionably in apparell version and in the offset driver tapped
Carlos,
The response looks to be within about 2dB of the sim, well within expected driver tolerances. Nice.
If the SPL readings are correct (65-75dBSPL), at 1meter, -15dB distortion (around 18%) is really poor.
At 44volts, 10 meters, the sub should hit around 100dB with only 6mm excursion at 60Hz.
Xmax is 8mm (16mm is a peak to peak figure on the spec sheet..).
Usually distortion is under 10% for good drivers run below Xmax.
Since you are planning to run on battery power, efficiency is important.
A 2x8" bass reflex with similar F3 can be built with half the volume.
A pair of those is close to double the efficiency in the 50-100 Hz range (1-3.5% vs 2-6%).
Uses double the drivers, but a fraction of the wood- considering the cost of the drivers, and lugging a lot less weight,
you might want to consider the simple bass reflex cabinets too.
The bass reflex excursion is less, and driver loading less severe, which also should reduce distortion.
The bass reflex could also be tuned much lower with relatively little cabinet size increase.
Anyway, always tradeoffs- the Paraflex upper response gain is nice, but if you like more of a "haystack" LF bass response, the BR may be more to your liking.
Art
Carlos if you get a chance go back to the -990 DB frequencies. Irregardless of the speaker design end up with the information and some things that go along with that I think you might find interesting. I don’t wanna lose the opportunity to show you something that is exploding all over the Internet elsewhere and speaker design as a result of how unique those expose something and it has a lot more to do with other things than speakers subwoofers it wilI don’t wanna lose the opportunity to show you something that is exploding all over the Internet elsewhere and speaker design as a result of how unique those expose something and it has a lot more to do with other things than speakers subwoofers. However it’s incredible how they go hand-in-hand and expose something that nothing else is going to do and it’s gonna be missed and that’s going to be unfortunate because if you ever wanna understand the connection between the mass of shapes in spherical volumes and higher orders it’s impossible. None of us know that math I doubt anybody wants to play that long and calculus or spherical trigonometry to figure it out either because simply put he can’t even visualize the eighth order of steers when it’s already 12 of them in a sphere or six of them around the circle that fit in that that point and eight order it will be 240 somehow?
MeanwhilE The whole concept is cheating and based on the numbers involved up there and well that makes absolutely no sense whatsoever right now it’s not that long of a story or sequence of things to look at which are no harder than putting 1÷254 in to the calculator and realizing what each one of those decimals grouped in little parts mean and in about four or five ways each?
no matter what you make for a closure don’t miss an opportunity to learn something about everything right here and it needs those frequencies that you find it -990 to make the connection to something much much huger in science and math and speakers as you will see eventually.
MeanwhilE The whole concept is cheating and based on the numbers involved up there and well that makes absolutely no sense whatsoever right now it’s not that long of a story or sequence of things to look at which are no harder than putting 1÷254 in to the calculator and realizing what each one of those decimals grouped in little parts mean and in about four or five ways each?
no matter what you make for a closure don’t miss an opportunity to learn something about everything right here and it needs those frequencies that you find it -990 to make the connection to something much much huger in science and math and speakers as you will see eventually.
Thanks for your input - food for thought 🙂
The Spl on those sweeps wasn't calibrated and the voltage wasn't measured, so don't read too much into that. Tthe sweeps were at about 5m. No efficiency information there, but the prediction of >120dB at 240w input power seems reasonable based on the what I'm seeing.
I'll take another look at the distortion figures when I build a mk2, the measurement was made at reasonably high level, I was kneeling on the box and could feel a surprising amount of flex from the top panel. Actual levels were about as high as I can go here without upsetting the neighbours!
I have looked at reflex, I'm really building this to have a look/listen with something else. The box as built is for sure far from perfect, but the sound is interesting enough to make me want to work on it a little more.
You are right, though I think I will build a compact reflex box with these as well though, for comparison - here is compact 2x dual 8" 20l boxes with 240w total compared with the tp-qwr thing, same power, same f3.
Carlos,
Horn transmission losses are assumed to be zero, unless absorbent filling material is specified.
Without the QL parameter as used for Hornresp vented-box enclosure systems, the output of the port will appear more peaky and greater than it will when actually measured.
An example like your model above:
Now with QTC:
Around a 5 dB difference at Fb.
The above sims port velocity is a bit high, one should size the ports for under 25 m/sec when driven to Xmax (8mm) at the excursion peak above Fb to avoid noise and port compression. That said, high port velocities blow heat out of the box, which helps cool drivers and reduce "power compression" when the voice coils heat up...
Your 21.62 liter sim has larger port volume than needed for an 8mm excursion, you could get more output per liter using a larger Vrc and smaller Ap, especially if you are only driving to under half Xmax at the excursion peak above Fb.
From the Hornresp Help file:
"Vented-box enclosure system losses are taken into account using the QL quality factor parameter. The default value is 7 but the value can be adjusted between 1 and 99 by double-clicking on the input parameters window QL or Lossless label in edit mode. The value can also be adjusted using the QL slider control in the Chamber section of the Loudspeaker Wizard. If the Loudspeaker Wizard slider is set to the maximum position, the true lossless model is selected. If the slider QL label is double-clicked, the control is reset to the default value of 7. The QL parameter reverts to the default value of 7 when a different record is selected or a new record is added."
Cheers,
Art