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radulescu_paul_mircea last won the day on March 9

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About radulescu_paul_mircea

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  1. Questions about othorn,keystone, Xoc1 th18, DSL118 and others

    I didn't test it after all , because I changed the 18"s with 21"s to use them in my own designs. I don't want to use that design anymore, it's better to use my own The difference though is huge, the efficiency and thermal stability are way higher than those of the SW115. I'll use the 18 IPal in one of my other designs and after that I'll use the 18Sound where normal drivers are needed. And the 21" Ipal is so powerful compared to anything else, the sound is so much better!
  2. iPAL enclosure details

    I did this week. No response yet.
  3. iPAL enclosure details

    For me, it's a strong hiss from the speaker. And also some high pitch sound. Also, when the signal is very very low, the sound is very similar to that one produced by a rubbing voice coil, but this happens with only this amp
  4. iPAL enclosure details

    If you have the module, can you please tell me how noisy is it? Mine are terrible on this spec, the amp generates a very powerful hiss and buzz through the driver. I've even disconnected the coolers to see if the interference is from there but nothing happened. Also, I haven't managed to connect it with power control manager software, I've tried it with two PC's and with 2 different serial adapters. I don't know if you saw that they have changed the specs on this one. They reduced the max Voltage from 195 to 180 peak, the current also and the power is now 4500 watts at 2 ohms. In the software the maximum power is 5000 VA PK, current is 100 and true power is 700 watts over a maximum of 3 seconds. This means it is way lower than a channel from a K20 and TBH, if a SpeakerPower SP 6000 is capable to sustain that power for 4 seconds and then to drop to 2400 watts , that is way more that what this one is capable of.
  5. Ricci's Skhorn Subwoofer & Files

    If you leave the response as it is , you'll see that the impulse response is truncated at +500 Ms from ref time. If you use the tools to change it at 125 Ms and to increase the zeros before ref to keep the resolution, you'll find that the response gets clearer. This is because I was surrounded by solid buildings and their reflexions were very powerful
  6. Ricci's Skhorn Subwoofer & Files

    I used about 28 volts for these measurements , but the voltmeter wasn't very precise so until I get a better weather to be able to take another reading with a new ,much better meter, I'll settle for what I have now. I have used one FP14000 clone for them , and adding another dual 18, 3 drivers per channel, I managed to pop a 16A breaker at 230 V. It is quite power hungry
  7. Ricci's Skhorn Subwoofer & Files

    They 1, 2, 4 in a 2 by 2 stack and 4 in a vertical line stack. The measurements were taken at 0 deg, 90 deg ,135 deg and 180 deg from axis on ground. The noise floor wasn't that high. It was lower than 60 dB for most of the time and when the wind was harder, I paused the measurements until it settled.
  8. iPAL enclosure details

    I've just tried it. It doesn't start if it has the mic disconnected, it goes into protect at power up.
  9. Ricci's Skhorn Subwoofer & Files

    I used a set of 4 single 18" custom subs loaded with RCF LF18G401, made for a client, which are used as low kick.
  10. Ricci's Skhorn Subwoofer & Files

    For anyone who wants to see the measurements for the directivity of 1,2 and 4 single 18" subwoofers in different configurations, on and off axys, you can access my Drive account and download the zip with REW measurements. Where there is a V, it means vertical possition You would need to change the Impulse response windowing to Left Window Tukey 0.25 400 ms, Right Window Blackman-Harris 7- 150 ms and Ref. T is left in place for each sweep. https://drive.google.com/open?id=15MmO5qj9v1RLZfO1_BYkUIAf6MDLi8M2 I hope it works.
  11. Holophony

    Hello everyone, Here you can find cool information about a concept for audio reproduction. I was following the work of Holoplot company from Germany for a while and I tried to learn more about the way they work. Now I got my answer from Mr. Charlie Hughes, who is a consultant for the concept in the link https://www.jambase.com/article/madison-square-garden-co-open-concert-changing-msg-sphere-arena-las-vegas holoplot.com http://www.holophony.net/
  12. Ricci's Skhorn Subwoofer & Files

    Haha. Yeah, that group can be a time black hole. But lots of good stuff overall, even though like any other forum or group there is some background noise.
  13. Ricci's Skhorn Subwoofer & Files

    https://www.facebook.com/groups/733449990043427/?ref=group_header This is an awesome group on Facebook and I've been posting there for a while. Some of my measurements can be found over there and many other discussions mostly for pro audio. You can find manufacturers there , like Brandon Heinz (from Renkus Heinz) Dave Millard, representative from full far audio, Sean Hennessey and some others. Please, feel free to join!
  14. Ricci's Skhorn Subwoofer & Files

    Testing the Directivity index of different configurations of subs and summation. Wow!! With only 4 single 18 in a square stack, one gets a huge front to back directivity. I've tried a single, double vertical, double horizontal, 4x 2 by 2 stack, 4 tall and I forgot about 4 horizontal but I was already frozen by then. On axys , 90 deg, 135 and 180 degrees off axis, at 1, 2, 4 and 10 meters. Well calibrated mic , ECM8000 with absolute SPL calibrated from a B&K 2270 to 0.1 dB ( hard work to do that unfortunately, I'll get a new mic very soon), Focusrite Scarlett 2i2, REW with loop, 20 meters from any wall, sweep measurements and RTA. I also did CEA2010 bursts , maximum SPL and loads of fun! Plus some playing with a closed enclosure loaded with dual 21Ipal isobaric series. Amplifiers were a FP14000 clone, one Crown XLS 2002 and one Martin MA2.8. I'll need to find a way to post pictures here, I have some graphs, I have 130 measurements , I'll make some plots , some excel work on them. @Ricci yes I am using ABEC 3 but barely. It is way to complicated for now and I don't pretend I am getting any easy progress. I have an Akabak script on my older laptop (it doesn't run on Windows 10) that I could copy and post or send to PM. It is not very detailed but with the additions I managed to get a higher Directivity and a closer response.
  15. Ricci's Skhorn Subwoofer & Files

    Welcome Moar!! Thanks for the link, it is a very useful tool. I needed that in my life Playing with it I've been getting very interesting results, some of them really incredible. Even from a single enclosure, the Directivity starts to go forward even at very low frequencies like 40 Hz. This made me go out in a parking lot with 4 single 18 subs and to take directivity measurements.