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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. 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.
  15. 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.
  16. 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
  17. Working on this project doesnt affect the other things we have in the works, "and all that that implies"
  18. 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.
  19. As you know the larger the driver the easier it is to get more travel, more room for suspension etc. As far as total displacement capacity this would be more like 3-4 of the highest travel 18's out there, then considering it has enough motor to would work in a box only about twice the size of a "smallish" 18" box, its starts to not be too terribly bad as far as "value" goes. When you add the "coolness" factor of the overall design it starts to get more exciting, and that's worth something too. As for Graphene cones I talked to the company, and they are interested in the idea but they said they are a long way still from making anything bigger than a 3" cone, but it would be "possible" to do, so many sometime down the road. Mind you it may be a very long time before even this starts to move forward anyway, it will require a big investment in tooling etc, so unless we get some people to buy into some it will be a while.
  20. Not sure but I will look into that. I know the regular carbon fiber process we are doing to make the 21" cones in house works very well. I had thought about exploring something like carbotanium though so nothing is set in stone yet, maybe graphetanium?
  21. Funny the surround is probably the only part that would not be custom tooled and made just for this driver. The one available for 24" is good for about 65mm each way although I need to test it and see for sure what it will do, if it will do anything past 65 will probably just go with it, although custom tooling a surround is possible. Ricci, I was hoping you wouldn't say anything too quick, but yes it will use spiders like we were discussing.
  22. Currently this is "vaporware", but I thought I would put the concept we have put together out there to see what interest there might be in something this crazy, because it is totally possible, and the designing part of my brain simply cannot be stopped so I just keep coming up with these things. It would require major custom tooling to make most of the parts, so cost would be very high, as they would not be done in very high numbers, if at all, so this is not a "value" proposition in any way, that being the case its likely most practical to make it a finished "system" vs just the raw driver, although we are open either way if anyone is interested in just the driver. Finished sub would be in the 15-20k each range, driver probably around 10-12k each Here is a general rundown of the features; Driver would be underhung with; ~50mm Xmax ~70mm Xmech ~1200g mms Bl2/re ~800-1000 Underpole Neo magnets, conical segmented ring system with venting through, and 4" diameter pole vent, think halfway between neo radial and the common under pole slug, so the pole vent size is kept large for low turbulence, magnet volume is high, and is kept far enough from the coil to stay cool. Under 100lbs total driver weight 10" diameter voice coil, quad 4ohm flat wire. Full aluminum sleeve over pole, maybe even aluminum sleeve outside the coil too, I think we can keep the normalized inductance to 1mH/ohm or less. Solid carbon fiber cone/former/dustcap, as one piece structure. Custom machined modular aluminum basket For the finished subwoofer the cabinet would be good around 150-200L, so about 28" wide 28" high 24" deep with curved sided cabinet nice finish etc. The amplifier would be a 4 x 2400 watt unit, one channel per coil, so 9600 RMS total, we have the rack version from the 18.2 or we can do a plate version built in like we used on some custom 21.2's we did last year.
  23. 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.
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