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Bill Fitzmaurice

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About Bill Fitzmaurice

  • Birthday 27/10/1949

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    New Hampshire, USA

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  1. A line source projects an equally high wavefront, with the sound intensity at any single point of that wavefront only a portion of the whole. With a point source all of the intensity lies within the much shorter wavefront. That being the case even when a mic near the speaker is within the wavefront the lower intensity at the mic with a line versus point source reduces the potential for feedback.
  2. The Bose configuration is intended to widen high frequency horizontal dispersion. They did it that way instead of the right way, which is to use tweeters rather than just midbasses alone. That's true of large arrays, 3 meters or more high. With shorter arrays the main benefit is the reduction of the vertical dispersion angle, especially in the high frequencies. This sends more energy to the audience where you want it, less to the floor and ceiling where you don't. The result is much cleaner sound, especially in acoustically poor environments, which is probably 95% of the clubs we play. Even a short array of tweeters only 40cm high can work much better than the typical point source horn used in most PA speakers.
  3. It wasn't all that large, and that's one reason why it was horrible. There wasn't enough air space. It would have with a flat baffle, but not with the angling. Plus it wasn't ported, and it used guitar drivers. Fender didn't make a decent bass cab until the 1980s. I designed guitar cabs that are cross-fired inward and angled upward and they work very well, but with guitar cabs the air space doesn't matter.
  4. De-coupling can work, but not for the reasons given by their proponents. Stages don't vibrate in response to being in contact with a cab. They vibrate in resonance with the acoustic output of a cab, which can then cause the cab to vibrate. In extreme but very rare cases that can result in a low frequency feedback loop. Isolation by and large doesn't do much, as it doesn't address the cause. What does work is a parametric EQ, to dial out the resonant frequencies, and lifting high enough to create a floor reflection null at the primary resonant frequency. Identifying the resonance used to be a matter of trial and error, but RTA apps make it easy. I have this one on my phone: https://play.google.com/store/apps/details?id=com.dom.audioanalyzer&pli=1
  5. My preference is to hear what they hear. To each their own.
  6. By all means don't forget the banjo, starting at 3:25. https://www.youtube.com/watch?v=yQhCtyHpVB0&t=124s
  7. No stand required. Tilting the cab back does what you need. The top picture is a cab flat on the floor. The audience is within the arc where the mids and highs are audible, you're not. The bottom picture is tilted back. Both you and the audience are within the mids and highs dispersion arc.
  8. I always wondered why the English were so hell bent on conquering Scotland. Sure, they had bagpipes, kilts and haggis, but otherwise what was the attraction? Scotch? Not that we were all that smart for acquiring Texas and Florida. That's come back to bite us in the arse big time. 😲
  9. The sound of the accordion, which is only surpassed by the bagpipes as hand held cacophony devices. BTW, it was the Irish who invented the pipes as vermin repellent. After the Scots brought the gift of the game of golf to the Irish the Irish returned the favor by giving the bagpipe to the Scots. The Scots didn't know it was a joke. 🤪
  10. I've played every genre except polka, it's never influenced my gear choices.
  11. What's that? Never heard of it. But then I've only been playing since 1965. 😉 Only when lifted at least 70cm, and even then the change could be for the better, it can reduce boom.
  12. If that's what a symphony player had can you imagine Ian Anderson's system? 🤑
  13. FWIW time was my band had all the volume we needed using a Fender Dual Showman Reverb 100w head into two JBL 4560A clones that I built. Vocals only, but with our backline we got by big time. My bass cab, 'The Hulk', would have made Entwistle envious. Three fifteens in a rear loaded folded horn that stood nearly two meters high. It made people run in fear for their lives with only a 50 watt Bassman head. Good times. ☺️
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