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radulescu_paul_mircea

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About radulescu_paul_mircea

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  1. radulescu_paul_mircea

    Ricci's Skhorn Subwoofer & Files

    140*100*70 cm .
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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.
  7. radulescu_paul_mircea

    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!
  8. radulescu_paul_mircea

    iPAL enclosure details

    I did this week. No response yet.
  9. radulescu_paul_mircea

    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
  10. radulescu_paul_mircea

    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.
  11. radulescu_paul_mircea

    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
  12. radulescu_paul_mircea

    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
  13. radulescu_paul_mircea

    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.
  14. radulescu_paul_mircea

    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.
  15. radulescu_paul_mircea

    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.
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