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Funk Audio

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Funk Audio last won the day on August 23

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  1. The calculator I found allows orientation and ambient temp settings, if I set it to 20c and face down the power drops to 42watts. I am sure one could calculate the thermal resistance of the air in the box and the wood as well and input the degrees/watt resistance to the calculator as well to get a more accurate sim. If I change the ambient temp to 50c degrees, to assume the inside of the enclosure might stabilize at that then the power to get the coil over 220c drops to 35watts. Adding steel helps but even setting the final surface area to what a huge motor would have keeping the source(coil) the same size and setting 1mm air between the coil and steel brings us up to ~55watts at 50c ambient, ~65watts at 20c. My main point is no matter what you do its usually going to be a dismally low amount of true RMS power a driver can take for an infinite period of time.
  2. That actually becomes a calculable thing at that point. You can call the coil a flat heat sink, there are online calculators to tell you how many watts will reach what temp in ambient air. I put in the area for a 4" coil 2" long, at 50watts it hits 225c so that's where it would melt, high temp coil insulation is rated at 220.
  3. I think long term would be best, as most of the time the power level used on a passive system to get the highest sweep is about the amount of power that would be spec'ed for it in use, so even if a system can do more with more power in the upper frequencies most applications wont bother taking advantage of it.
  4. I am aware of the things you mention, what I am talking about is going the next level and implementing it in a high end system made up of all kinds of different components, and compensating for driver specific changes, meaning you would need to know what to have the system change to compensate, and where for each part of the system, a little harder to do when its not a complete integrated system. Also I am talking about not just frequency response correction. Again though there is the question of what do you bother compensating for, to what degree and would it be of much detectable value.
  5. 🤔"reactive dsp" I wonder if that could be a thing, albeit prohibitively complex and expensive I am sure. Have sensors that detect temp humidity pressure and even outside noise, that feedback into a system that compensates in the dsp signal processing with some noise canceling action too.
  6. That's what keeps things interesting for me, always trying to learn more, the hows whys and what matters, then how to correlate the science to the perception, by no means does anyone have it "all figured out". Some of science's biggest discoveries have been accidents. I have to humbly admit I have discovered some things by accident myself. Humidity can very well affect some materials, thick untreated paper cones would change in mass/damping properties, I have never investigated this so I cant say how significant the differences would be. Most suspensions shouldn't be affected much with the synthetic materials and resins used, temperature certainly can change them though, that is something I consider in designs. For things like that you factor for a range, min max, and make sure everything still falls within desired spec at each end of the range. Luckily we don't need worry about the speakers/subs any of us use(make) working right at -40 or anything like that, I believe that would cause some issues.
  7. I do believe your right on that.
  8. Have to say I am kicking myself now for not sending in the square versions of the 18.0 and 21.0, those curved sides 🤔 The 18.0 we make in a 20"x20"x20" cube and the 21.0 in a 22.25"x22.25"x16", both have identical internal volume to the ones tested.
  9. I have to agree with you there, firstly its impractical to test even all the known aspects, things like intermodulation distortion, and subharmonic distortion, are factors I consider in designs that also affect the sound but to test these adds a whole other level of complexity. Besides the fact that who besides the engineers designing drivers/systems know how to interpret them. As it stands a lot of people already don't know how or even misinterpret the measurements Databass does do. I know there are some out there who believe we know all there is to know about drivers and how they work, and how to test every aspect of them and that how they sound can be completely derived from these tests, but I have been listening to designing and building drivers for some time now and even with all the possible aspects we know about and test for I still believe its fully possible that there are things about drivers we haven't even put a name to yet let alone devised a way to test.
  10. Hi, Just trying to clear out some space and have a few old random things I would like to get rid of, open to offers on it all. These things have just been sitting around so long I hate to just toss perfectly good stuff but I need them gone so I have lowered prices to bottom line, basically to cover shipping and packing. One Aura NS 18 motor for sale. Madisound sells replacement tops for them or someone might be able to build it into custom driver, I do have the top assembly from it with blown coil the cone spider and surround are in perfect shape if someone wants it but that will add some cost to ship. Motor shipped within USA $140 One Ciare SW18, great shape tested only shipped within USA $175 Two AE TD12M, they are from different times and so they look a little different but are in perfect working condition. $130 shipped in USA for both One B&C 12NDL76 like new. $75 shipped in USA all sold
  11. I found the same issue and that's why we never used it in production as most of our products are used in quiet environments, also connecting to the controls I recall being tricky. I am not surprised that they derated it, hopefully that means there are some "hardwired" protections now implemented, because you could set it up in the DSP to be able to blow traces right off the main amp board with over current . This I found out the hard way .
  12. If there was demand for it we do have a design for a motor between the GUJvX and UHv1. It would give a BL2/Re right around 200, with all else the same as the GUJ18vX. Price would be almost exactly halfway between the UH21v1 and GUJ18vX. The other option could be a slightly souped up TSADv1, we could get the BL2/Re on it up to around 200 for not much higher cost, would end up nearly the same cost as the GUJ18vX.
  13. To get that little inductance on a coil that size that can take a serious amount of power with that much travel and keep a BL good all while being underhung requires a really crazy motor, basically this is just as "crazy" as the Uber 24" just scaled down, and the price would be similarly proportional. 10 of these with the same power and same enclosure volume would outperform the Uber 24" for a sealed system. They would work great ported too, and should run up clean really high. This is all still theoretical though remember.
  14. So you could be excited about a 12" with specs like so; Underhung Neo of course Carbon fiber cone/cap 4.5” Edgewound single layer coil on kapton former Full alu shorting ring 20mm Xmax 30mm Xmech Fs 31.00 Hz Re 3.80 Ohm Qms 4.30 Qes 0.30 Sd 500.0 cm2 Vas 70.0 l Le 0.30 mH SPL at 1 W 1 m 90.3 dB SPL at 2.83 Vrms 1m 93.6 dB Qts 0.280 Effective Qts 0.280 Bl 18.06 Tm
  15. Working on this project doesnt affect the other things we have in the works, "and all that that implies"
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