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Funk Audio

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Everything posted by Funk Audio

  1. Last I talked to Josh, sounded like he would be game for my idea, if only this covid thing would go away already.... maybe one day hopefully. I suggested to fly him and his gear up here, we have a suitable area to test, and for the cost of sending him a couple things we could do, well everything we can manage to have prepped 🤪.
  2. You can see how the early version of this did for seeing what kind of excursion the GUJ platform is capable of here; https://data-bass.com/#/systems/5c2682df1cefb00004803ab5?_k=4sikz2 You can see it can out travel the dual IPAL21 tested, and this version has over twice the normalized motor strength.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 🤔"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.
  8. 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.
  9. I do believe your right on that.
  10. 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.
  11. 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.
  12. 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
  13. 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 .
  14. What range do you run the MBM's for, have you tried running just the UH's up to the mains? Also I think something is off with your sims if you got a Q ~0.5, two drivers in 240L should be closer to 0.35, which is a lot closer to what you measured.
  15. We did find under extreme conditions the leads would touch the cone, and we had thought the epoxy would insulate it enough *if the leads ever touched but we found it did not. Its not enough conductivity to actually "short" but it did enough conductivity to deteriorate the lead wire. The shrink tube over the leads makes them behave better anyway so it was a win win.
  16. Air cooling still has a lot of potential before liquid cooling is needed, I have some ideas for some really crazy stuff with unique air cooling system(I do have some ideas for liquid cooling as well), but nothing that's really "practical" either way. That wont stop me though , just might be a while.
  17. Yes we are now using a high end 3M shrink tube over the whole lead wire, and I am really happy with how they are working, So far in testing they seem to be immune from any possible "flapping"(and subsequent touching of the cone as a result) as can be an issue at certain frequencies when they are long enough to accommodate these excursion levels. And I have never liked leads sewn into the spider.
  18. I believe he said 4.5 per driver. Are you talking in sim land? . Real world is a little different sometimes. Based on our in house tests compared to the 21.0, the UH21 given the same power in the same box ~3 cubic feet internal, the long term output sweep was about 1-2db lower across the board, although distortion under 60hz was a little better. Throw it in about 7 cubic feet and long term sweep output was 1-2 db higher than the 21.0 under 50hz, along with much lower distortion. In 4.5 it should be fairly close to that, as 7 is too big, didn't actually take much power in the low end. So overall long term output in 4.5 cubic feet should be similar to the GUJ21v1 as tested 20hz down(but with much lower distortion), about halfway between the GUJ21v1 and the 21.0 20-40hz about the same as the 21.0 50-60hz, and a couple db below the 21.0 above 60hz.
  19. Ok that's what it is then. Its official
  20. We are open to suggestions, UH21 Mk1 could work.
  21. So due to the confusion that seems to be happening with the GUJV1 motor being a Focusworks Audio product, and the GUJV2 being Funk Audio, we have decided we should rename it before putting it up for sale. What does everyone think of; UHFA(driver size) Mk1?, (under hung funk audio, mark one).
  22. If you built the enclosure with panels attached on both sides in front of the drivers spaced away from the cabinet with standoffs, you would have perfectly symmetrical driver loading and you could place it tight to the wall, and also have something close to the other side as well without worry, the "slot loading" affect could be reduced by having both the front and top edges open, vs just the front
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