My buddy and I have built quite a few octoport boxes. Once a few people saw us make boxes like that it was on. It is a pain but it looks awesome and they’ve always sounded good. Great video as always
Adding funny little things without bringing any attention to them (like the finger hands) is way funnier than cutting in movie clips and cartoon sound effects that wind up just wasting time like other channels do. Love this channel!
I'm a dumb ape. I called everyone for round tubes. They didn't have my size. One shipping tube company quoted me $375 to make a cardboard tube. Angrily I purchased a 3D printer to make a 7.125" port, and joined short sections of PC filament tube (printer bed height issues) together for the tuning frequency. I also now have a small flotilla of tug boats. 😅
You should do a couple of videos about getting the most out of inexpensive subs and speakers, using processing, enclosures, sound deadening, and placement
@@AlanRaybasshead I think it would be really cool to take a couple of cheap subs, like something from Boss or Dayton audio, and do a build to get the absolute most in terms of sound quality and output.
@@justsomeyeti5814 got my ears tingling, I got four single voice coil subs that were doing on 136 in their recommended sealed enclosure, building another quad box with aero ports to get more out of them on a sfb1000... I love 4ohm single voice coil subwoofers because, in parallel the easiest wiring process they go down to one ohm. Which I found almost any amp I've ever run is stable enough to do with enough juice. I got a box in mind that should be musical but rail. I'm no major box designer but I sure like to design with budget in mind😁
I like to put Octoport into 4th order band pass boxes. I run to through the rear chamber to get the length inside the box. For this situation I find it sounds better and looks way better than a slot port.
#tinyhandarmy 😂 How to measure for a truck subwoofer: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-t_KK8XPyxDg.html How to Aeroport a Pipe Port: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dCYPyW2pnJk.html Making a T-Line Subwoofer Box: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KuBTuUdy460.html
It’s quite fun when you think of the ports total surface area to displacement volume it takes up. Slot ports with three common walls are the most space efficient but depending on the ratio of width to height (square is best) you may not have enough port area or you may have a super thin width port = sounds bad/port noise. On the opposite side aero ports or round ports have the least total surface area but do not get to use part of the boxes sides so it’s displacement volume is usually larger once you factor in the additional bracing required a slot port 3 common wall gives. Every other shape approaching a circle aka hexagon or octagonal shaped ports end up with more surface area and volume (but you can make them custom and usually more rigid than an aero port without fiberglass reinforcement).
For pipe size problems. Stainless exhaust pipe and aluminium boost pipe, comes in measurements up to 3" and normally comes in multiple sizes normally in 3/8s - 3 to 4mm differences at a time. I know metal isn't perfect for resonance but you have a large choice in sizes.
I dont have much space in my car and my sub box is taking my whole back space thus the port is very limited, does moving the port to the top make it any better and be less sufficated?
To adjust the guide on the table saw to accommodate for the angle, just put a square on the piece with the shortest side (2.5") at the bottom. Measure that gap. Multiply by 2 and add that to the 2.5". Set your guide to the total. Why waste the wood?
Even doing it your way, you'd waste a little, because you would have to find tune it at least a little bit anyway. Doing the cut-then-adjust method is simpler.
@@coreycantwell2019 to each there own. My way there's less waste and for me it's easier. As for quicker, I could have my piece cut before he would at that method. There's no wrong way with either, I was simoly stating a way that has less waste and in all reality, is quicker.
How do you figure port length when the edges are rounded over on the ends? Where does your port actually end? I ask because the ends of your port are actually a larger diameter than what the port is supposed to be.
Mark, Can you go over how to set the round over bits so it give such a smooth tangent radius? I don’t remember you covering that in your router skills videos. Thanks
Isn't your example of length based on diameter of the tube? Obviously you dont want to go small enough to cause chuffing issues, but couldn't you reduce the diameter to allow for a shorter tube?
If it’s internal to the box, there’s so much wasted air volume with the thickness of the wood too. In a smaller enclosure, losing that volume will only make the port that much longer. I would only use them for external ports in an SPL application
@@CarAudioFabrication if you have any job site near you making house or so they trow the small peace away i used to put them in the ground i put sewage and water main in they way i say that sc. 40 works good when i was in my 20s lol i made a bass tube out one and thoult i was the man but look back now i make it all out of food would sound better like all your video great to watch and learn more about this stuff now i just have one 10 sub in my scion xb with a mono amp hit good i think lol
Maybe I'm just getting old But if it not a Sealed box it a slot port box I've even ran a 12" in a 5 gallon bucket with a port just to get by I've even ported 6x9 and used 6x9 as subs
I’m wondering if a prime number of sides (like, say, 7) would be better; as it’s more resistant to the formation of standing waves between the flat planes of the sides?
In theory yes. I did a quick calculation and the first harmonic of this port's walls is 2152.60591 Hz which I would hope isn't being sent to the sub. You'll also note that a round tube has an infinite number of parallel sides which would make them more likely to have this problem.
@@Thomamps Um… I get the feeling that some calculus gets involved when the tube is circular; but I’m too groggy - it’s 2am here - to throw anymore brain cells at it..…
It looks cool, but halfway through the video i decided it wasent cool enough for all that math. The box itself makes my head spin and adding this would just make it explode. I think an adjustable areo port and some test tones would be best for me. 😄👍
That doesn't really add up. If you used more ports (of the same diameter) that would mean more port area and thus even longer ports than original for the same tuning.
@@CarAudioFabrication I didn’t think you’d actually read my comment so I made it short 😂. I’m a broke diy-er, I had a sealed 10” enclosure that I wanted to port down to ~35hz. I found a calculator, and I calculated based on my limitations of using pvc pipe, which has a fixed diameter but variable length. If I were to use 3” or 4” diameter pipe I would’ve needed outrageously long ports. Most calculators only let you chose single or dual port, but I found one that let me use 4. I was able to achieve my desired hz by using (4) 3/4 pvc tubes cut 6.75” in length.
Making an octoport looks really fun but I think I would just cut out a bunch of circle pieces with a router and make a wood aero port before I made one of these. Unless a customer directly requests it
Really love your videos I subscribe some months ago and you've shared some great info......really like your channel and sponsors products. I'm a newby to car audio I got a 2003 honda civic with a 12" sub 1200w dual voice coil but needs help with an amplifier...would really appreciate if you or your sponsor could help me out thanks #caraudiofabrication #audiocontrol 👍👍👍👍👍👍👍👍
But... what if you're a Bond villain, like Octopussy? Or a SpiderMan villain, like Dr. Octavius? It'd probably be okay then... I haven't had the courage to drill into my Lesux to install my sub or bypass the horrible amps that the car came with.
Because once you understand it it is just as accurate of a unit system as metric. Contrary to your beliefs the only benefit of metric is it is easier to remember. It's not more accurate or precise. The vast majority of my audience is in the US and understands imperial units over metric.
Incorrect. A 90 degree edge does not become a fillet until a roundover is applied. "A fillet is a curved face of a constant or variable radius that is tangent to, and that joins, two surfaces."
@@CarAudioFabrication apparently I wasn't clear in my statement. The 90 degree before the round over, Roman Ogee, miter what ever, is absolutely called a fillet. Words like 'incorrect' make you seem douchey or like the old Speak and Spell.
I'm having trouble calculating an enclosure for.an 18" sub the outside is 18.5 looking for 2.5 cube box for a.4th order..If anyone could help with the angle and the size pieces I need Thanks in Advance