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radulescu_paul_mircea

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radulescu_paul_mircea last won the day on May 15 2019

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  1. I believe you will always get a smashing win when going diy vs commercial bang for buck! There's no competition. I went that way too. You need 3 SKhorn to meet 2 BC218 over 30 hz , but under 30hz it will be more of a 2 to 1 ratio. If you went lower, the ports would need to be a lot bigger in length and noise would go down. f132 goes just up to 60 hz. The new Powersoft designs go to 100. I think best bang for buck is SKhorn, best smashing output density and wow factor is EDMSub from Powersoft with dual 30" drivers , which is 2 or 3 times more powerful long term than 1 SKhorn. Ipal drivers don't go that low even though they are beefed up. Eminence is a bit better that low because of the lower fs IMO
  2. Hi! I have some questions for you before I can answer yours. First of all, where are you from ? What is the main purpose you need these subs? Rental, Live events, DJ, club, or home use? what type of music are you mostly working with? yes , I heard BC218 , a pair, they are tremendous subs! But very very large. Really full power at 25 hz I also heard M-Force drivers in F132 from Funktion one and some prototypes from Powersoft before launching. F132 goes as low, at 25-26 hz if I would compare BC218 to F132 I would say they have the same extension, same cleanliness, but F132 is louder and BC218 goes higher,it's easier to integrate without kicks . SKhorn is not tuned as low in native mode. Tuned at 30 hz, the ports are pretty noisy, but the sound is really good. I felt like the sub could benefit from a larger enclosure with larger ports and a bit higher tune, at 32 hz , and that's why I chose to make it that way. In essence it's the same sub, if left at 29 hz tuning, it was maybe 1 dB louder which is nothing. I would go for the original design. If you need it for dance and techno etc, then larger is a bit better but not worth the added weight and volume. but when used with 1/3 of the port closed, it does extend as low as the other two. I think BC218 is 3 dB louder under 30 hz but infinitely more clean . F132 is probably 6 dB louder or so and probably even cleaner. min skhorn I tried lots of drivers, best was RCF LF21N551 but that's not available anymore. I liked it more than 21Ipal, similar power but sounded deeper. Next choice would be Eminence. the new M-Force designs are promising but they are pretty much same as a dual 21" sub, except of EDMsub with dual driver. That's a malefic beast
  3. I was just wanting to post it! They've been working on them for a while, changed the motor a lot
  4. Yes, it happened to me with B&C drivers . You will find my video on YouTube
  5. In the last 2 editions of Voice Coil magazine they measured the Eminence drivers, the 18" and the 21".
  6. Extremely interesting idea about this amp? Are you limiting it to 110V-16A it will you go to 230 V and even more, like 32 A ?
  7. This is not M-Force , it’s a chinese A&D audio driver. Neo motor and 8” coil. I heard the M-Force more than once and it is absolutely amazing. Unfortunately the users had some unlucky situations with them but they indeed perform extremely well! that Funktion one sub is the loudest sub out there !period ! and it digs deep enough to be extremely impressive. It goes louder under 50 hz than 2 SKhorns XL loaded with Ipal and used with other subs from 60 hz up they will have enough headroom. There are a few companies who have 6 and 8 of them in use constantly with great results.
  8. It is in fact a modified version of 18SW100. Slight difference, mostly in suspension
  9. Improve collateral heat transfer from the coil directly to the environment instead of coil to magnet assembly. With M-FORCE is really easy, but with a moving coil, it is really complicated. I really like a more open assembly, like those made by the car audio sub manufacturers. DD Z series comes to mind. Add a cooler and you're done! I own 2 Ipal modules. They are powerful and really good match for a 21Ipal driver. One could get the other into thermal limit of either one of them , depending on situation. The DPC sensor position has to be in the Apex of the horn
  10. In my SKhorn XLs I put them on the inside, to keep the design . They are absolutely needed in pro use, I found anything from sweaters, bottles, shoes, screws to napkins, purses and all kind of things inside
  11. http://www.atelier-der-tonkunst.de/produkte/pol-ddi This is the link to the product. Really good and very low distortion. Capable of taking 200 Vrms at under 1% THD is super useful. I tested it for limiter settings and it works as it should. I will try to get my hand around on how to use it for live Impedance monitoring. That would help me a lot
  12. Found a solution. Instead of using an oscilloscope to look at the voltage, I got a device with -40 dB of voltage gain reduction, with galvanic separation to be used directly with a sound card. I can now use it to get measurements for sound output in paralel with voltage output. I can even use the output of the amplifier as an input reference for transfer function of the speaker alone, with any nonlinearity of the amp eliminated . But I can also measure the amp dynamically, in use, which is a nice feature
  13. This cabinet is tricky. The sound is absolutely stunning, but the thermal behavior is not best. It is best used in a low bandwidth and techno is to be avoided. Even though a dual 18TBX100 sub is from -6 to-10 dB in maximum output compared to my dual 221 Ipal Skhorn XL subs, half the dimensions, on techno the are as loud when limiters intervenes. They do not sound nowhere near as good, but they are quite close in output. This is because the impredance minimum from 45 Hz to 85 Hz is dead centered in the band where that kind of music is centered
  14. He's K10 doesn't have DSP I suppose, otherwise why wouldn't he use the internal DSP? In a SKhorn or Skram subwoofer, with 8 or 4 ohm drivers , one wouldn't have to use a peak limiter with any amp except K20. Engage clip limiter in K/X series or soft clipping on any other amp and then use a really long term limiter. If the limiter is not a gain reduction system, but a normal limiter, take care with the voltage values , because if there is more distortion than it should, it will increase the average power and decrease the crest factor. A 21SW152 coil without moving can get burned even with 200 watts ( meaning continous current or sines at frequencies where excursion is really really low. In use, you can use 500 watts as an excellent protection strategy if you don't stay in limit permanently.
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