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Everything posted by peniku8

  1. Which of the two styles would you guys prefer? Currently it shows values for 1khz for full range reference and 30Hz for deep bass reference, but I'm not even sure if that's needed. The data table clutters the graph a lot imo Evaluations will additionally have these: Which will react like this when they're presented with differing values for bust and peak:
  2. I've build 20 speakers with this dado size now and I see no reason why I'd need them to be deeper. And tbh, I don't think it's worth the hassle to make them when you don't have a CNC. You'll waste all the time you save on assembly with making the joints, possibly more.
  3. If you're talking about the dado joints, I always make them 3mm. That way I can cut them with max feed rates on my machine without worrying about inaccuracies too much. I never felt the need to make them bigger, they're mostly for easier positioning anyways, so 3mm is just fine for that. imo it doesn't matter stability wise, unless you expect to throw the cabs off a balcony often.
  4. Well to be fair, I didn't double check and thought I was testing it into 2x8R, but instead the load bank was set to 4+2 Ohm...
  5. And the loadbank causes another casualty.. this time it's a Yamaha CR-600. Fuses are done for, but I hope everything else is still good. Measurements of my Hypex FA123 coming soon. Also ordered dedicated measurement equipment, since I already had trouble measuring the true performance of the Hypex amps... Fireface not clean enough. Getting the Cosmos ADC to use with a Topping D10b. Probably also going to get the Cosmos APU once it releases, which includes a 1khz notch and a preamp capable to delivering phantom power with lots of gain.
  6. The QSC sub is larger and probably has more vent area compared to the Skram (when you block Skram ports to reach the same ~25Hz(?) tuning), meaning the QSC will be louder in the sub bass. Skram is front loaded, which means it's more efficient (louder) in the mid/upper-bass region. Skram is basically a band pass, which means it also masks some distortion. That would be the 3 main differences I guess. Skram has a rising native voltage sensitivity, while the QSC is probably pretty flat, going by my gut feeling here.
  7. The ds and sw are very similar in maximum output at their respective program powers. Bennett from B&C said you should only really use the sw if you need the higher power handling, otherwise it doesn't really matter which you pick so you should go for the cheaper one. Here is a hornresp of different drivers I've compared in the SKhorn
  8. And I just moved and only have headphones at the moment 😖 I'm just gonna say that I believe that most, if not all difference in tonality between different drivers or these subs vs 'normal' subs in a home setting is due to a lack of EQ/calibration. I've been using the SKHorn in my HT for over a year and calibrated to the same response I could hardly hear any difference to the 12" Klipsch sub I had at lower volumes. The SKHorn integrated into my HT just like any other sub. Electrically. Not physically... These type of cabs often have a significant bump somewhere between 100 and 200Hz, which means your acoustic crossover will be higher than expected (unless they're on a dsp), which probably is what you're describing as 'Brute-ish' or 'dark'. Thanks to rona I have 4 unused 21ds115's in my basement right now. It makes me sad not letting them loose from time to time. Maybe I can fit a DO 15TBX100 sub into my new room, but maybe I won't even need it with 4x8" woofers from the mains I will be setting up soon. Okay, who am I kidding, of course I will need more woofage. @jay michaelI had to mount 4 braked wheels to my cabs. If I don't engage the brakes after they're set up, the wheels will rattle, but it's a downfiring design. How are yours behaving?
  9. Do you have casters on the back of the cabs? My DIY 21" cabs have slots, which serve as handles inside the horn mouth and wheels on the back (on the hatch, which is almost as big as the entire rear of the cab), which makes them really easy to move around. I imagine the horn mouth of the SKRams would also server as a good handle to throw them onto their backs. I'm sure stacking 3 ain't fun. My back hurts from looking at that stack, the SKRam looks like it's at least 150lbs!
  10. What do you mean by low level? The last measurement was taken at 0dbFS, which produced 6,6V at the Fireface's output. Here is a direct measurement of the FF without the pmillett in the loop (max output 6,6V as before): Best THD is achieved at 0.5V output, best noise floor at maximum. Here is the THD/Noise vs output plot:
  11. Pmillett Sound Card Interface loopback measurements: Measurement chain is Fireface UC → SCI (Generator input) → Internal loopback → Fireface UC The SCI converts the balanced signal of the Fireface internally and outputs either balanaced or unbalanced, which can be switched. It doubles the output voltage, so if I input 2V balanced, it outputs 4V balanced or 4V unbalanced. Voltages seen are after conversion (means the Fireface outputs half the voltage displayed). Measurements are sorted by voltage ascending. The 1V measurement looks similar to the Fireface loopback, so I guess the pmillett isn't adding too much distortion. The pmillett started distorting at about 8.6V output (unbalanced). When I switched it to balanced, the distortion increased a bit, but there was more headroom (presumably twice the voltage). Here is a measurement of the Fireface at 0dbFS, which produced 13,25V at the Pmillett's generator output, which is about 24,6dbU:
  12. I figured out the mains hum, which was a rack power strip mounted above my patchbay in my outboard rack. The following measurement was taken with the power strip switched off: THD looks good, but THD+N still pretty bad, I'm not sure why that is, as I can't really see anything that dirty in the rta there...
  13. The Fireface had been RMA'd once and ever since it seems to reset the connection to the PC occasionally when a ceiling light (LED or Tungsten) is switched on or off, which is very annoying. I suppose there might be something wrong still, which might also cause the mains hum (50hz here in Germany) plus its 3rd harmonic, which is the reason the THD+N gets tanked. I think I should contact RME customer support to confirm whether these results are expected or not. I ran this through my patch bay in the outboard rack, which meant 50ft of cable, but it was balanced so it should not matter much?
  14. I took some new distortion measurements of the interface and the Pmillet Sound Card Interface I'm using. I decided to use REW's RTA to take these, as it gave it more flexibility with window sizes and averaging etc. 0dbV is not correct, but I had to 'calibrate' it to zero, since I couldn't find a way to take the fundamental as reference. Thoughts?
  15. 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).
  16. 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)
  17. 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...
  18. 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.
  19. 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.
  20. 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.
  21. 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...
  22. That looks dope! Were you running them off the CVRs?
  23. 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..!
  24. 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
  25. 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
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