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radulescu_paul_mircea

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About radulescu_paul_mircea

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  1. radulescu_paul_mircea

    iPAL enclosure details

    Yes, the DSP is pretty old design, it is focused mostly on reaching the 2 microseconds latency to be able to use the DPC sensor and not on SNR. This means it is not suitable for cinema sound systems
  2. radulescu_paul_mircea

    iPAL enclosure details

    It is the DSP, it is made for outdoor pro audio usage, where the signal to noise improves
  3. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    The new sub design in grey vs this one including some power compression effects added as eq , 140*140*70 cm so 40% larger. I put 2 vs 2 because from my experiments with subs the response doesn't go lower when multiples are used but they can take more power with less excursion and distortions, so it is a bit closer to real world results. I'll use 7075 alluminum braces to save volume, add stiffness and decrease weight. The drivers will have 2 additional ways of cooling so in normal full power usage, it will closer to 2 SKH larger, but the same number of drivers and amp channels as one.
  4. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    The idea behind this build is to learn. I started my company to sell subs, because here in this part of Europe, there is a very deep lack of powerful high quality bass Mostly I wanted to see people's reactions, the power density, the extension, to see if the weight and dimensions are a big problem. They are now installed in a basement where we got them by hand. I wanted to see about the power compression, port noises, chuffing, I have learned how and why to install protection grilles, handles, wheels, I wanted to see if I can improve their performance in any way without any other compromise except cost and complexity. I wanted to learn about braces, hatches, accessibility. These gave me a good insight on all of these These subs will be loaded with 21ID and Ipal modules and will permanently stay in rent in a small club where people love good sound. Based on what I learned, I'll continue my other designs and after all 4 designs will be ready and I'll have a stock of 4 of each, I'll publish the specs, measurements, graphs , technical details , pictures and videos and I'll start selling those.
  5. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    From what I can figure out from the output prediction on Direct from Danley, this sub is on par with TH812, including efficiency, impedance graphs, response and SPL
  6. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    The sound is the best I have ever heard, including F132+F221 combination. It lacks the 40 Hz punch a bit, there is a slight issue with that area when the drivers are in series. I need to take them out again and get some impedance measurements series and parallel to see if there is any difference at very small signals. I felt that 4 TH18 would match the output of two of these between 37-47 Hz. But yes, absolutely no match at 30 Hz. I get about 4.5 dB of compression on very long sines , 0.3-0.6 sec but no noises and the chuffing is pretty much absent. I would love to compare them to a set of KS28 from L-acoustics, Gravity 218 and 30 from PK sound and other subs that say they go down to 30 Hz. I don't like that the hatches are not as solid as I would like and the bracings inside are very ineffective, I need to rethink them altogether. I'll probably change the whole thing to see what improvement I can make disregarding cost. Some aluminium braces, some very well rounded port ends, playing with driver position, some different new ways of cooling the driver even at excursion minimums to increase the life expectancy of the coils , thinking of some kind of net for safety on ports because now someone could throw a bottle inside an that would not be very helpful. I am now very much interested in a larger version with the horn loading the driver lower and better . But the weight is already high, 165 kg , so we'll see.
  7. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    I got myself a Powersoft K20 for these and tested them at full power for 20 hours,the amount of power and the stability that amp has is way way higher than what the clone or the Crown could ever dream off. I set the limiters and processing and I installed them in a small club for further long term tests. The deep end is imense. I have a pair of xoc1 TH18, we got 2 Vs 2 with their own processing and limiters on a K10 and the 2 large SKHorn got +10 dB on a 2 minutes average pink noise dBz and +18 dB at 30 Hz .
  8. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    The drivers used are 21Ipal , yes . The drivers in F221 are an OEM combination from Fane with Precision Devices, neo driver. The subs are extremely loud , but not on their own . I did some tests regarding the frequency response of a single vs double F221. The tests have revealed me something really cool. The magnitude response stays the same, it just goes up with 6 dB ,double the sound pressure, but the maximum clean output CEA bursts results go higher. Practically a better acoutic impedance will give better load and lower excursion. Plus, the electrical impedance goes a bit higher on average so the real sensitivity for 1 W is increasing CEA-2010 max burst, 2 m ground plane , measured at 4 and 8 meters to avoid mic clipping 1*F221 1 channel of ffa10000 25- 107.9 30-116.1 31.5- 118 40-133.1 50-135.7 60-137.1 80-143.2 100-142.6 2*F221, 2 channels of FFA10000 25- 116.8 30-125.5 31.5-128.5 40-141.5 50-143.6 60-144.7 80-147.9 100-148.1
  9. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    Sensitivity referenced at 1W/1 m measured at 4 meters, 2.83 V in 0.5 ohms on BPH221 vs 28.3 V in two 8 Ohm F121subs
  10. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    This is the excursion of two 21Ipal in series in the same enclosure, with the CMS having a difference of only 10% between them. The place where I did these tests is a parking lot from an old factory where we have the workshop. It is surrounded only by other workshops and some offices that were closed at that moment. The parking lot is big, around 50 by 60 meters and if I go as close to the middle as I can, the frequency resolution is very good and I can get good accuracy down to 20 Hz.
  11. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    @Ricci Thank you for the reply. I am a bit concerned about that behavior, it is not related to the loading in the horn,but the behavior of two reactive loads linked in series, that see different voltages based on the difference in impedance and electrical phase. Anyway, the subs are extremely potent, the content below 40 is so present and clean! I wouldn't be afraid to put them next to Funktion One F132. Unfortunately the clone power supply was not up for the task and after less than an hour with a sub on each channel, it died. Then I tested them with 2 Crown 5002VZ in parallel mode, each sub on a channel and the deepest bass was achieved , it could sustain 85 volts in impedance minimums without any sign of backing up, but the punch and headroom was smaller than with the clone. The next step is to completely change the bracings, build another pair, load them up with 21ID and IPal modules, buy a K20 and then compare them 2 vs 2 and see what happens, whichever is best. I bet on the K20+ 21Ipal combination but one could never be sure until I get the tests results. I would love to use these with SpeakerPower modules, each driver on its own amp, with 4-6 kw, because IMO , that's when the party is really starting. Unfortunately it's hard to buy them from the states.
  12. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    @Ricci Did you have any problems linking the drivers in series on a single amp? From what I get in sims and in free air tests, the excursion goes mad if the parameters are just a bit different on the 2 drivers. Also the loading can change the behavior
  13. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    So after all, the CEA-2010 from REW is showing the peak pressure level of the frequency tested, not a mean, so one one shouldn't add another 3 dB to get a peak.
  14. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    This is the final measurement before painting and adding some damping materials
  15. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    After adding two more braces from one side to the other, I did another round d of bursts. 4 meters, added 6 dB for 2 meters equivalent. 25-126.7 dB 30-136.7 dB 31,5- 137.3 db 40-141,4 dB? 50-144.2 dB? 80-146.4dB? 90-144.9 dB? 100-144,2dB ? The sensitivity at 30 Hz is 99.8 dB at 4 meters at 2.83 V. Just a dB higher than the original.
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