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Everything posted by radulescu_paul_mircea

  1. Cool!! Finally Let's see the results now ! I know how time consuming these things are and the work they involve so you are a special guy for sharing these with us. Thank you and I will wait patiently :-D
  2. If one ever wondered how stupid loud would 12 21" Ipal be in a relative small bandpass enclosures tuned to 50 HZ https://www.youtube.com/watch?v=k4ncqcAv0fE#t=1.877333 )
  3. Related to the Ipal Technology, I found a test with the 18 ID driver http://www.audioxpress.com/article/test-bench-eighteen-sound-18id-18-inch-woofer
  4. Cool. How does it behave at high excursions?
  5. I really have to know what those drivers are made of, cause I can get them at a hell of a good price but there has to be somewhere it doesn't perform as well as the 152. I can't wait to see what this sub is capable of also.
  6. As it turns out Ricci, the fact that the joint point of the driver is too small and the long term pressures and acceleration are to high for the diaphragm materials, they keep braking in use because the producers are not developing their own specific membrane to suit their application. I have this information from a sure source now so this is not only a speculation anymore.
  7. This sounds better than Netflix ) can't wait, man. I would also like to see 21ID and 18Ipal tested and some subs like the Funktion F132 . Also ,as daydreaming material, if Rockford could build a 24 T3...:-D
  8. And also if you have the will and money , a M-Drive module used for this sub if one is using the Ipal drivers That would be a killer. Probably in the same range as K-Array KS8 ( which costs 10000$ :-0) I think even better as that one is using the 21ID and Ipal MOD
  9. The input is this. Then with the added eq one will get this Could be better go sure Taking to account the eq and crossover the port velocity would be up to 70m/s and the front velocity would be at around 30 m/s at 25 mm excursion. It would be very chilly
  10. Yes , I like it a lot. The driver is backwards and stuck to the grill to increase cooling.I simmed it and it can get 142 dB în HR from 31 hz with only band pass filter and 3 PEQ entered.Quite easy to set it. port particle velocity at 50 m/s so not bad.at the mouth it will go to about 28 m/s and that will act as an efficient cooling method. The efficiency is very high, more than 12% from 33 hz up in singles
  11. http://www.pksound.ca/products/gravity-30/#1480026407865-fd911a0d-385b Another M-system platform sub. Bandpass
  12. I have good internet connection ) best in Europe for sure (1Gbps connection for 10$ a month via fiber optics ) Yes, Bassboss is BassMaxx renamed because that was a trademark so he couldn't use the name anymore. His approach for using BR for 22-60 hz and Horns for 40-100 with an excellent integration is very similar to a bandpass horn approach.
  13. Another brand that I know off of using this design principle (except KV2 ) is Traktion Sound , a small company with some interesting looking subs and speakers. http://www.tractionsound.com/loudspeakers/bps221-harpia.php They have a separated sub for 30-40 hz with dual 21", probably very efficient in the pass band and another for the rest of the range ,smaller with dual 18".that is probably a very good approach for best efficiency.
  14. How the hell I missed this thread? Daaamn! I am working at some Bandpass subs and as you know they are the best option with good drivers now. I think I have simed more then 2000 iterations with all drivers possible from the worst to the best, to the impossible ) Band-pass horn in Othorn dimensions on the market ALERT! http://www.bassboss.com/subs/vs21-rum-punch-sub/ About 2 db less than the othorn though. I would probably not try to have the smallest enclosure and go for larger cab, ports and horn to get most of the drivers and amp there because they cost much more than wood and food for the people that carries it ) probably 50*40*25 or something.
  15. Of course you would. But it would be more expensive.
  16. So Audiholics measured and reviewed the sub already http://www.audioholics.com/subwoofer-reviews/svs-pb16-ultra-subwoofer/measurements I thought Ricci did the measurements for their subs
  17. Also, if someone wants to visualize reflections click here http://amray.andymel.eu
  18. Something new and cool about room acoustics simulations. “This paper will present and discuss diffusion and the many problems with trying to measure it, displaying the data and using this data in ways that allow us to better predict room responses. We will quickly discuss prior standards, their strengths and weaknesses and how a new proposed ASTM standard will correct those weaknesses. We will show that methods used in other areas of acoustics and electro-acoustics can be used to measure diffusion and display it in ways that allow directivity, magnitude, and phase to be displayed. These data sets can then be used in simulation programs, such as EASE. Odeon and CATT Acoustics, to better predict room responses for use in the design of rooms. We will present examples of those uses and the advantages in these proposals." From ProSoundNetwork https://acousticsfirst.info/2016/11/18/acoustics-first-makes-sound-visible/ http://www.acousticsfirst.com
  19. I know this is a DIY project and most of the satisfaction and value of the speakers is in the designing and building process. But for 5000$ for a pair of square speakers with a limited output and connections why not go to the market's best bookshelf speakers ever made: Devialet Phantom Gold? Fully digital,with wireless transmission,optical input, fancy remote, very very stable connection. The bass drivers are low impedance with a tech similar to IPal, the amps and power source are much beafier the the Ice modules, you get 103 dB at 45 hz from a pair in room at 2 meters, it looks really nice. The drivers have about 13 mm xmax and 16 mm xvar.the mids and tweeters are coaxial, proprietary design. The graphs are measurements in room at 1 meter made by a guy on the devialet forum. I have sold a bunch of these. I had Beolab 90 in our shop and on moderate levels one could hear no big difference. Again, I love DIY but it has to offer a much bigger performance/value to worth the headache
  20. This website is where i view how waves behave with animations. it is very easy to understand if one uses visualization to understand and learn new things like I do. http://www.acs.psu.edu/drussell/demos.html
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