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peniku8

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peniku8 last won the day on September 29

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  1. Been doing some tests with my Hypex amps and just out of curiosity I ran them without water in the tank, because I wanted to see how warm the elements got when testing lower power levels. I put the bank on 8R (two elements in parallel) and gave it 50W for a minute. I could still touch the elements after the test was over. They were probably around 50°C (110°F?) at that point. Good news for me, as that means I can test everything below a few hundred watts without having to fill up the tank. I will give it a bit more power tomorrow to see how much the resistance changes, but it shouldn't be much. It's 8.2-8.3R cold and 8R under full load (3KW per element, which would mean an amp with 6KW into 8R would be required to saturate one channel).
  2. I agree on the 3 seconds part. Amps either drop off from burst power to sustained power within a fraction of a second or they're burst power=sustained power type of amps. Looking at my Sanway test reveals that nothing much changes after the cap banks are drained (after just shy of a second). After 2 seconds it ended up on its sustained power level, which would happen even faster when driving two channels. I think I'll go with 3 seconds at 1k, 100, 60, 30, 15 and 8Hz. It cuts down on my testing time, is less hard on the amps and my breakers are unlikely to trip like this. Looking back at my initial test, the 90 seconds test was pretty stupid. 90 seconds 100% duty cycle into 2R of a fan modded amp... I will fool around with REW and stepped sine wave tests as well, maybe that reveals some interesting results (It can step level now and not just frequency)
  3. Tbh I'd personally buy a large enough 3D printer. I have all kinds of equipment, which includes a CNC router, but even then, making horns is something I'd find cumbersome to do. Doing it on the CNC would require doing it in something like 1" slices. Doing it by hand with something like a large Dremel... inaccurate and really tideous work...
  4. It was 1khz, which meant maximum heat development in the amp, which was the cause for its failure. It sustained over 7khz (single channel) into 2R for 260 milliseconds at 1khz. That's 260 cycles. Wouldn't that means it's able to do 2.6 cycles at 10Hz at 7khz or does it behave differently? I was planning on measuring at different frequencies as well, but I have so many things on my plate at the moment, I can't tell when that'll happen. I was also pretty pissed when the amp went up in smoke, which is why I stopped testing. But I think it should be fine if I limit it to 10 second tests instead of 'seeing what will happen' (I left the amps running at max for 2 minutes). The amp threw my 16A 230V breaker after 16 seconds anyways, I should've left it at that instead of plugging it into a 32A circuit.
  5. My Sanway clone amp handled 2R (one channel) sustained without issues. I let it pump out 4KW (again, one channel; sine wave) into my loadbank for over a minute, but kinda forgot it was fan modded, so it overheated and blew up on me. I'd be pretty confident with the newer and sturdier version (mainly power supply changes with an additional fan next to the parts which blew up) when it's not fan modded. It muted the output pretty quickly into 1R (matter of milliseconds; SC protection kicked in), so it might not like it if the impedance of the actual cab dips below 2R.
  6. I'd say you have a pretty good overview already. I have 4 21ds115, but if you want some 1-2db more headroom, go for the Eminence. Your call if you wanna spend the extra on that. For me (in Germany), the Eminence is twice the price than the 21ds115. It's actually almost the same price than the 21IPAL here. In the states it's more like 500 vs 700$ between LaVoce and Eminence I think. I'd personally go for the latter there.
  7. You mentioned running limiters. Do the CVR amps have true power limiters? I'm looking for an affordable amp with a proper limiter and plenty of power. I own two Sanway amps (an FP13k and a D10Q, which is a dsp amp), but both have pretty useless peak limiters...
  8. That looks dope! Were you running them off the CVRs?
  9. Nah, that wouldn't impact the direct sound at a close range like that. It sounded like there was an 8khz high shelf on the bottom 2-3array elements which boosted that region by some 6db, in addition to being way too loud (it was an easy 10db louder there than everything past some 20ft from the stage. I didn't dare to go there again..!
  10. Yup, had everything cancelled for the last 15+ months, bar a single wedding. First show in a long while was 2 weeks ago. Audience of 200 (seated) in a location for 2000... was an interesting show. They had l.acoustics there with 10-12 Kiva line array elements per side. They were all running the same settings, which sounded to me like a distance compensation for ~30m (100ft) or longer, which meant the first few tables were being decapitated by extremely loud top-end... Guess we're all a bit rusty after such a long break or they just didn't care
  11. https://www.avsforum.com/threads/diy-mid-hi-bms-coax-2x-12-b-c.3006048/ Almost the same setup, I think @dsl1 was very happy with it
  12. The magic of PFC... love it
  13. Thanks for the paper, I've been looking for some more info the topic! If you had access to a flow sim software, you could probably get some decent info out of that, even if it works with (non compressible) liquids.
  14. Bennett from B&C suggested setting the true long term power limits around 1/10th of the program power, which would be 500W for an ipal for example, or 360W for the 4,5" 21DS115. I have no clue how good the cooling is on the Pyles, but power handling also depends on cabinet type, as you get less excursion (so less cooling) in sealed cabs for example, but I'm pretty sure you're not using sealed cabs for PA. You could try running the sub at a certain power limit for a while and measure the TS parameter shift. Or measure it acoustically and see where power compression sets in, maybe that is a good indicator as well.
  15. What I found interesting is that, as SME already described, I think the reference point for 'loud' music listening at home (mid and near field) is around 80dbA, which is where the 'excitement' starts and I feel engaged with the music as my main element of sensual stimulation. In a live setting in a large hall or outdoors, I found that this 'excitement' starts at pretty much exactly 100dbA. I've mixed a show at 97dbA and it was just lacking excitement. When I boosted the overall volume to around 100dbA, it was there, 103db and it was too loud. My show still was a few db less loud than the main act's, which I found too loud (rock with bagpipes, which can be pretty nasty up high). At home I'd die at 100dbA, that's just nuts, even for just a short moment. But what I've also found was that the lower the distortion of the system, the higher the point where "loud" becomes "too loud". I've finished a new system for my studio last week, which shouldn't exceed 0.2%THD@100db/1m 100Hz-20k and had a listening session with my dad. I turned it up a bit, but it didn't seem too excessive to me, until I tried to talk to my dad and noticed that he could barely converse, even while screaming at each other. It was a bit shocking and since I've installed the speakers in the studio I need to constantly remind myself to not turn it up too much, because now distortion is no longer an indication of loudness. Interestingly, the woofer and mid will show power compression even before they exceed 0.1% THD anywhere in the spectrum the operate in, which is very astonishing. Now I'll just need to build a sub for the system, but I haven't even tested it out for its bass capabilities. The four 8" drivers should make some decent noise near field, but are of course limited in the lower regions since the designs are sealed (avoiding port resonances and noise). Anyways, I'm pretty sure that system won't have a problem hitting 130db throughout most of the spectrum. My single near field SKHorn could already exceed 130db, I have no doubt that your system barely breaks a sweat at THX reference, unless you're going after the single digits.
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