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radulescu_paul_mircea

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Everything posted by radulescu_paul_mircea

  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. Hello guys, I was triyng to build a pair of Othorns before Christma2s but my plans didn't go that well because it seems I can't find nowhere to buy ( for now) a pair of 21's fron B&C or 18sounds. So, now i still want to build a pair of subs and I was looking in other projects. First I saw the Xoc's Th18 and then the Keystone which I like it more because it is easier to build and it kinda looks cool When I compared the Spl results from Walter's measurements I saw it can reach around 130 dB/1m GP and has a FR down to 35Hz.same with Th18. Othorn on the other hand goes 8Hz lower and it reached a max Spl of around 137 dB/1 m. Also, on the specs of TH118 from Danley they say it has 137 dB cont. Taking into acount the compression for the driver in the Keystone, at 1800 watts as Walter measured that seems to be a very real, easy to verify value. Also I trust Ricci's measurements so if he says his sub gives that Spl, it does. So, now, the questions: 1. Is the 21sw152 driver that much more powerfull to gain 6 dB more at higher freq than the 18sw115, even if it is tuned 8Hz lower 2.where does Danley take their nubers from? Because from what i see, the xoc1 design is preety much the same and it has around 6 dB less continous output 3. Is there a company that takes into account power compressio? Because I can't find any 4. Which should be better in a small space af around 300sqm beetwen 2 Keystone or 2 Othorn both with 18sw115. Paul
  4. 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.
  5. 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.
  6. 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
  7. 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.
  8. 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 .
  9. 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
  10. 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
  11. 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.
  12. 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.
  13. 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
  14. 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.
  15. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    This is the final measurement before painting and adding some damping materials
  16. 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.
  17. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    His 3 brothers are on their way, I'll have 2 with 21Ipal and 2 with 21ID but with slightly modified bracings. This one didn't behave as I wanted it to and there was a strong vibration on the large panels so I need to add 3 more pieces of wood from one side to the other. Another problem is the weight, at 165 kg, it is pretty hard to manage. After all , I will not build the back ones for cardioid configuration, I'll use them as they are. These are the test enclosures, to learn and to try things. They will be for comparing my new designs and to see what kind of improvements I can manage to squeeze , if I go bigger but I'll keep the dimensions constraint to 140*140*70/75 cm...
  18. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    Each driver on one FP14000 clone chanel, CEA2010 burst, calibrated mic, 4 meters, added 6dB for 2 m equivalent. Where you see a question mark, the amp turned itself off for protection. the closest buildig was at about 10 meters behind the sub. Bph221 25-124.1dB 31,5-135,1 dB 40-141,1 dB 50-144 dB? 80-145.3 dB? 90-144.9 dB? 100-144,2dB ?
  19. radulescu_paul_mircea

    New additions for db site (need feedback)

    DB site is not working? I get the error "Connection not private"
  20. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    140*100*70 cm .
  21. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    These are the modifications i made to this design, it is based on my sketches. I changed all the bracing, it was easier to make all of them with constant width because of the bigger width. The much bigger back chamber will surely increase the efficiency and power under 45 hz, I didn't feel the need to improve the horn on this one, it is good enough with just 20 cm extra length and an S1 correction. the material is already being cut
  22. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    Already ordered some wood, in fact a lot, I needed to order more to get the best price and I also need it for my other projects. I thought a lot of what you said and the sub would weight too much to be practical. So I decided to go modular. The idea is to make two SKHorns , but the depth will be 40" and the width 28", and port tuning will be a little higher , at 34 hz approximately, Just to get the best deep end I can, but also to match the top end a bit. The back enclosure will be an Ss15 based design, where I try to match the phase as well as I can, but I need the best efficiency to be centered around 50 Hz if I can, because I will make an end-fire configuration with that center frequency and the response of the front enclosure will have a high shelving in the back of it, so the frequency response for not need to match . The two enclosures will be installed back to back with screws buried on the sides . I wanted to use an electromagnet like the ones for doors , but that would complicate things a bit and unfortunately I'm a bit short on time I ended up with end-fire instead of gradient configuration after I did a very cool experiment. I put the RTA I'm REW on infinite averaging for a 5 hours set only with the music they are playing and the conclusion was that the energy is centered at 52 hz with a difference of 6 dB compared to the 40-110 hz band. So if I can get the attenuation of -15-20 dB at 52 hz in the very far field, over 100 meters distance in the back of the speakers, compared to a normal setup, it will be extremely helpful. I've already got my drivers, the difference between the B&C and the 21ID is night and day, power handling, excursion, shear mass, thermal inertia etc. But they are both extremely well.made drivers, with different applications for the same approach. The plan is to build these speakers for use in this application and to use them for comparing my own designs which will be build in the next month. I'll post some pictures when I'll start building
  23. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    The drivers are already here! The 21ID is so small and light compared to the 21Ipal.the cone is much softer, also, the coil is way smaller, with a much thinner wire and it gets hot more quickly. Probably twice as fast. The driver gets very noisy after about 3.5 cm excursion pk-pk , in comparison the B&C can travel about 5 cm before any strong noise . We clearly have a winner here, but that was not what I wanted to do. @Ricci you are right, the setup is a bit stupid proof, it's easier to get it right and to avoid any tempering with the setup. The decision is not final and it's pretty hard to get the fold good enough to match the phase and response of the front part. I also wanted to put the port and the horn in the center to get the acoustic path as close as possible vertically and horizontally
  24. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    I've just ordered 2 21Id drivers, so I'll probably build these. They'll have 2 21Ipal on the front in series and one 21ID on the back . I'll use a Powersoft K10 on the front drivers and a FP14K clone on the ones on the back, one on each channel . Processing will be a DBX driverack. It will be very helpful to get some direct comparisons between the 18Sound and B&C drivers, I'll also get to play with some mammoths, because they'll get very large
  25. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    What do you guys think of the idea of making this a cardioid sub. With 2 21" IPal on the front and one 21ID on the back to be able to use a 2 channel 2 ohms stable (ish) amp, like a clone , on each sub ? It would need to be 50% lager, practically to just go deeper and make a fold that works exactly like the front . I know the enclosure will vibrate more and it would be a bit hard to match the tuning for the port, but I think the hardest part is to get that horn right and to be able to find a good folding. It would probably need different hatches also But I need that configuration and I bet it would be awesome! Off course, it could be easier to build 3 SKHorns and stack them with one backwards but the place I would be using these is a bit wide and I need to spread them to have a better coverage.
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