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Aijan last won the day on September 1 2015

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About Aijan

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  1. I think the window's dimensions are too small for it to act like an entire wall in a SBA. My guess is that the mineral wool in the window slows down the speed of the sound and decreases the "port tune" a bit.
  2. We recently moved to a new house. I setup the subs (three 12" dual opposed cabs) in one of the two rooms in the basement (22'x12.5'x7.5'), and took some measurements, but something wasn't right: I had flat response down to 6hz! The subs start to roll off at around 40hz. I know it's not unusual to get flat response down to 12hz or so in a room like this with the help of some room gain, but getting another octave below that, now that's very unusual. Then it hit me -- we had quite a large internal window between the rooms in the basement for some reason, and I had filled it up with low density mineral wool to minimize sound leakage between the rooms. The window measures roughly 45"x32"x9", and it appears to work like a port tuned to 7hz or so if I'm correct. So, the question is why build large ported subs when you can use compact sealed subs and simply add a window to one of the walls instead?
  3. Crown doesn't talk about the filters in their literature, but if you call them they will confirm their existence. They don't really care about running sealed subs. These amps are for PA use, and 30hz is probably the lowest PA subs are expected to reproduce. Unfortunately I don't know any good sub amps with quiet fans, but someone else will likely guide you in the right direction.
  4. I would advise against Crown XLS (or XLI/XTI) as a sub amp. They have undefeatable subsonic filters which make them unsuitable for sealed subs.
  5. Just watched Slumdog Millionaire. Didn't expect much in the bass department, but pleasantly surprised: loud, powerful midbass with some ULF thrown in. No wonder it got an Oscar for sound mixing. Would love to see it measured.
  6. Thanks for the offer. I'm not sure how good the audio is in the YouTube clips as their bitrate is quite low.
  7. I have just watched Final Fantasy: The Spirits Within (2001), and there were a number of scenes with impressive bass. It would be great if it gets measured.
  8. Looks like a DNS issue (that is the domain is not correctly resolved and pointed to your server). You might want to contact your web host and ask them if there is a problem with their DNS service. The DNS service for data-bass.com is currently provided by hostlatte.com according to the domain's whois record.
  9. This subwoofer has been compared to JL Audio F113 on various forums over the years, and if I recall correctly, the consensus was that they were more or less the same, maybe giving a slight edge to F113. However, Ricci's measurements paint a completely different picture. JL's "lower-end" E112, which is said to have about 1.5 db less output than a F112 matches and even slightly beats the SB13 below 50hz. As SB13's 13.5" driver has about 40% more surface area than E112's 12" driver, this is even more remarkable. From this results, I think it is safe to say that JL F113 has at least 3db more output than a SB13.
  10. http://nautil.us/blog/the-sound-so-loud-that-it-circled-the-earth-four-times
  11. Just stumbled on this one: http://www.coolpicturegallery.net/2009/12/biggest-subwoofer-in-world.html Compression chamber made of bricks! 120 dB sensitivity! All I can say is wow!
  12. I have just discovered Oi (1) by N-Plants, an ambient track that features strong bass in the 10hz - 20hz range. It doesn't quite have the peaks of Bass I Love You, but it's a lot more musical imo. Available on iTunes. Spectrum plots below.
  13. MemX, I wasn't expecting much of a difference, but the slightly shorter cable did tighten the bass. According to http://www.electrovoice.com/cableloss.php given a damping factor of 150 at 8 ohms (half of EP4000's 300 DF due to bridging), the final DF at 3 ohms using 2.5mm2 cable will be ~17.7 (8.5m) vs ~15.7 (10m). The amount of attenuation that electrical damping provides is: DF10 = -20dB, DF20 = -26dB, DF50 = -33dB (ref: http://eaw.com/docs/6_Technical_Information/StudyHall_and_TechNotes/Damping_factor.pdf )
  14. I used to think that the cable resistance wouldn't make much of a difference, but apparently it does for subwoofers probably because of the heavy cones used and the relatively loose suspensions required for high xmax. When I first hooked up my 13W7, the only cable I had on hand was 1.5mm2 (~16 AWG) for a 10 meter run. The bass was heavy with that cable. Using 2.5mm2 (~13 AWG) immediately tightened the sound. Then I took Ricci's advice and bridged the amp, and despite the thicker cable, the bass became heavy again due to the damping factor being cut in half. Shortening the cable down to 8.5m has helped tighten the bass again. Various sources on the web recommends a minimum damping factor of 15 to 20 after cable losses. To my ears anything less than 15 does start to have a negative effect on the sound. Yes, I have a dual 1.5 ohm 13W7. I am happy with the sound with the amp bridged.
  15. Thanks Ricci. I went ahead and bridged the EP4000. I had a relatively wide bw ~4.5db boost @20hz. I cut it back 1db just to be on the safe side. The bass did get more powerful alright, but it also became sloppier. An online search revealed the culprit. Apparently, bridging an amp cuts its damping factor in half, and I had a rather long cable run. Fortunately, I had used more cable than necessary, and shortening the cable tightened the bass again. BTW, the best cable loss calculator I have found is http://www.electrovoice.com/cableloss.php as it takes damping factor into account. There is one surprise though: I have gained about 2hz of extension (-6db point is 11hz now vs 13hz before). I am not sure how this happened (the gain is there regardless of volume or my 1db change in eq).
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