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Everything posted by 1point21gigawatts

  1. I’ve been swamped with work. Almost every day I long for sleep. I’m gonna have it finished this weekend.
  2. That’s a major thing to say about somebody. Just because somebody doesn’t answer you doesn’t make them a bad person nor useless. There’s no such thing as a useless being, substance or essence. Everybody and everything has worth and a purpose.You have to think beyond what’s irritating you and realize people, places and things all function differently and just because they don’t put you in their function doesn’t mean any insult, ill intentions or harm to you. Also, what if he has been doing his own thing and not really focusing on some stuff because he is going through something and handling his own life. You can’t be mad at somebody about that. Quit being like that dude. Chill out and bass on.
  3. Your enclosure now is already small and you want louder and harder hitting bass on the same rms, which is minimal rms after rise for that subwoofer. The only thing that can be done in this case is increase the net volume. You are thinking too hard into this. And that straw and toilet paper tube analogy wasn’t used correctly. Of course more air velocity is generated throw a smaller tube on the same amount of rms. But if the rms is too high for that tube’s diameter then there would be port noise because the air would be traveling too fast. You don’t want high port velocity. You have to stop looking too hard into this because you are gonna keep running into contradictions and become more indecisive.
  4. I’m not understanding what you are saying. What volume level does distortion occur on the subwoofer rca at 40hz and what volume level does distortion occur on the front or rear rca at 1khz?
  5. I’m gonna reference the numbers of the new enclosure in multiple programs and calculators before I draw up a cut sheet.
  6. I just noticed that Torres calculates end correction factors port width plus half of port width instead of just half of port width. Idk why he calculates end correction factors like that. Only half the port is added to the physical length to find the effective length of the port. End correction factoring is added because the end of the port shares a common wall with the enclosure making the subwoofer see a longer port. Only an extra half the width of the port is what the subwoofer sees as port length as long as the end of the port isn’t the width of the port away from the side wall which would add more effective length. I’ll calculate them specs to reference. Because port length is not something to miscalculate.
  7. I can just draw up that slot port design you did. It’s good. Plus you can tell people who hear how good it sounds that you designed it.
  8. I don’t even know why I asked that stupid question about what’s more important to you. I’m getting tired. Lol! I’m about to go to bed. Think about what type of enclosure you want me to draw up for you. Do some research on both and comparisons and then we can touch base tomorrow.
  9. In this application since it isn’t a wall or something like that, an aero port would be louder and sound better. The ported enclosure I designed for myself was strictly spl because it was designed with a lot of port area and bandwidth wasn’t something I cared about when designing it. I could use a lot of port area in that build because the enclosure only being about 4.6 cubes after displacements on around 6000-8000 rms after rise. But I decided to change to an aero port because in most regular applications an aero port is better and louder because air flows better through a tube than a rectangle or square and the response is better because of that too. But on that spl slot ported enclosure I designed would probably be louder than the aero ported one I designed but not sound nearly as good. But when it comes to your build, an aero port is the best way to go, no doubt.
  10. You are welcome. Question though, have you considered an aero ported enclosure? I was wanting to do a slot ported strictly spl enclosure on my application but, I decided to do a musical aero ported enclosure instead because it would have spl and be musical, have a wider bandwidth, more efficient, a better air flow and easier to design and build. Even though I could design and build a complicated and difficult enclosure, easier is always better.
  11. That would work. Since I factored in the impedance rise best case scenario instead of doing port velocity calculations on 2000 rms. That enclosure would work just fine. It would have good bandwidth and good output. I like it.
  12. Read this. People believe things when they hear it from reputable sources. https://ddaudio.com/subwoofer-enclosure-design-bending-the-rules-maximize-output/
  13. When you gather information from all over the place and don’t use that information correctly to weigh right from wrong then it’s easy to become confused and indecisive about a matter. I skimmed through them screenshots and seen facts and fiction and didn’t even have to study it and keep reading it to asses the general knowledge from it. If I were a noob that didn’t know how to build enclosures, I could use that information you posted and come to a conclusion quick because I’m smart. If you do the mathematics on the port area of both enclosures I told you to choose from, one has 12.3 square inches of port area per cubic foot and the other has 16 square inches of port area per cubic foot. That’s kinda what was told to you in the screenshots you posted. And 2.3 cubes is 15% bigger than 2 cubes that’s recommended. That’s not enough of an increase to cause the subwoofer to reach its mechanical limits and bottom out and damage the subwoofer. That’s 5-10% less than the maximum increase before bottoming out would occur and the amp would have to be stronger to cause that on that subwoofer. You have understand each subwoofer is different and designing an enclosure has to be done by factoring in the t/s parameters. The recommendations of sizing is just a basic idea. And when it comes to port noise, the more the rms and lower the tuning, the wider the port has to be to not have port noise. More rms increase port velocity and lower tuning increases port velocity. Some designers and builders use less port area to accommodate for the area available when building an enclosure with a lot of subwoofers and it helps with bandwidth and accuracy depending on the application and design, but takes away from the output. As long as it isn’t a crazy amount of port area, the bandwidth would be fine and it wouldn’t reach mechanical limits. That why I suggested an spl slot port enclosure with 16 sq” per cube and a musical aero port enclosure with a little less than 12.3 sq” per cube. And a 15% increase would increase output without reaching mechanical limits. Most pros that compete increase the sizing of their enclosures by 10-20% to increase output and they throw more than rated rms at the subwoofers. Plus recommendations about sizing is just to reference. You have to factor in the t/s parameters of the subwoofer and the rms of the amp. That amp 2400.1 you are using isn’t doing 2000 rms after rise. Rise differs on each frequency, subwoofer and application and cabin area surrounding said enclosure. Dude just messaged me earlier today and he is rising from 1 ohm to about 4 or 5 ohms and on a bass 30k only doing 9000 rms. So a 30,000 rms amp is only doing 9,000 rms after rise on his set up on whatever frequency he tested it on with an amm-1. So with that said, the enclosure has to be bigger because you are probably doing around 1000 rms. That figure is based off of the specs of that amp and the absolute lowest rise if the subwoofer, application and cabin area surrounding it permits minimal rise from about 1 ohm to 2.5 ohms. Rising from 1 ohm to 2.5 ohms is minimal rise and would make any bass head happy as shit. Before I begin to type or draw something up, I learn every piece of the equation and factor in so many different variables and calculations and base the variables off of facts and if facts are unavailable and it’s something like impedance rise, I would factor in the best possible scenario when it comes to that when designing an enclosure because if I calculated using the worse case scenario of impedance rise then it would leave too much room for error. Factoring the best case senecio leave no room for error when it comes to that variable. Then on some variables I have to factor it worse case scenario to ensure no errors arise. Averaging is something that works with some things but averaging can be problematic if something in the equation is below average or below average.
  14. Around 2.3 cubes with about 37 sq” of port area tuned to 32hz. 4” wide port that yields a velocity slightly under 17 m/s. I had already told you this. Trust me dude. It’ll sound so good and loud. Or if you want more efficiency, then just incorporate a 6” flared aero port instead on the same 2.3 cubes net volume. The port area is about 9” less but the efficiency would make up for it. Less port area is needed when using aero ports. Think of it like this. What is used for optimal flow? What shape is a straw or pipe?
  15. Maybe something malfunctioned in your cc-1 recently. Idk. Weird.
  16. You are using the cc-1 incorrectly then. It does the same thing as the dmm method but it is better and can do a little more. The sfb amps are full bridge amps that make it where you can set the crossovers with a dmm. But regular half bridge amps subsonic filter, even though a subsonic filter and high pass filter are basically the same thing, it won’t allow you to set the subsonic filter using a dmm but a dmm can set a high pass filter on a full bridge amp. It makes no sense. But a cc-1 can set any filter. You just have to learn the cc-1 correctly. You are doing something wrong even though it seems like you are doing everything right. It happens sometimes. Even to pros.
  17. My bad. I didn’t mean it in a bad way. You are not wasting anybody’s time. I feel bad now. I just don’t understand why you can’t just turn your head unit all the way up first and then play a 40hz test tone and finally set that amp’e gain accordingly. Explain to me so I can understand what you are doing and what’s happening after the loc and then I can understand and further assess the situation and then help.
  18. @William94, Dude, you are making this WAY MORE than it actually is. This is what the urban people call “doing too much” lol! But yeah, You DON’T have to test an loc for distortion. You only have to test the device connected to the loc to find a clipping point, if there is one, then at that point, test the device the loc is connected to, to match that signal the loc is sending to the device the loc is connected to. That’s how you find a clean signal in that situation. The loc is just there to make the signal. Finding a point to tune at and matching that signal is how you distinguish clean signal from distortion.
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