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Thread: Resonance -- let's get this hammered out!

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  1. #1
    Council Member Novastar's Avatar
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    Default Resonance -- let's get this hammered out!

    Ok folks... I know very little about resonance other than the following:

    1. Space in front of your speaker is just as important as space behind it.

    2. There is a certain amount of cavity that is "ideal" given any speaker setup. Although that is tough to find, and what we're talking about.

    Does anyone out there have some really good data on how to go about creating a very "tuned" resonance cavity? I know Erv has hinted toward it in his .pdf, but naturally this is a detailed subject.

    I can safely say that resonance plays a *GIGANTOR* role in making an identical speaker in saber X... sound far, far better than saber Y.

    It's true that a better speaker = a better speaker... but you can also have:

    * Average speaker + GREAT setup = FANTASTIC sound
    vs.
    * Fantastic spaker + POOR setup = Average sound

    Thoughts? Best to reply here if you really know what the heck is going on with sound. I've already done a bunch of experimental "amateur" tests that simply are via my ears... using an apples to apples comparison of the same speaker in like 5 differing resonance setups.
    ~~ GREYTALE NOVASTAR (Writer, Director, Choreographer, Sound Designer, Actor, Saber Designer, Vocal Artist)
    ~~ Balance of Power, EP I: "Into The Lion's Den"
    ~~ Balance of Power, EP II: "Ashes of The Phoenix"
    ~~ The Crystal Focus Sound CD Compendiums... are HERE! ~~
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    xwingband's Avatar
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    Default

    I'm not so big on the back of the speaker. In my experience it's not nearly as important as the business end of the speaker.

    The most important thing is a seal with the chamber. I've used everything from a liberal application of glue to o-rings.

    Otherwise a general 1" or so has fine to me. Taking more than that has been overkill. It starts to trade lowering the pitch for volume, almost begins to muffle the clarity.

    I don't think we can get it to any science... you're not going to calculate the pipe length and correlate it with the pitch that it will equal (and thus resonate best). If anyone did... I'd pat them on the back and tell them to get a life.

    I'd like to start messing with speakers, but like a lot of things (switches?) there are too many options and then they go to waste sitting in my box 'o stuff.
    RED LEADER Standing by!

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    Jedi Council Member vortextwist's Avatar
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    Default

    I agree with x to about the air behind is not as important as the ability to get it flowing out. All of the sound comes from the front of the speakers. It's just like my bass cab, the pulsing of the speaker is what makes the sound we hear. Sure you need a little behind but only so the speaker can move freely.


    BLUE 3- Ready

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    Jedi Padawan jjshumpert's Avatar
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    Default resonance

    the rule of thumb with speaker design is to have a closed air space for the speaker to draw from and a larger ported space for the sound to escape from whatever its mounted in. having room on the basket side of the speaker in our applications is not an issue when it comes down to it since the speaker is so small it needs less that 1/16th of an inch cubic space for projection. take my mr luke conversions, i mount the driver in a plastic tube that is just large enough for the sound module and relay. behind the module towards the pommel is the recharge pack, and the pommel is sealed off with fiberglass making it imposible to actually draw air from that end of the hilt. i then mount the speaker to the top of the module which places it just behind the first blackened section of the grooved forward grip. i make 6 equilateral cuts per ring along this entire section and the sound for the saber is done. once everything is hooked up and you fire the saber it is loud enough that you cant hear a stock luke sitting beside my setup, which i would say is a great improvement considering the luke is one of their louder hilts.

    kinda off subject but how bout sending over one of these uber speakers for me to play around with? sounds like a great coil and i have some over the top hilts i want to try it in...

  5. #5
    Council Member Novastar's Avatar
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    Thanks guys... I'll be reviewing all this in detail to be sure of what everyone is saying and see about how it differs (or is similar) to what I did for the Flange v3. I tried to give it as much resonance as possible without overdoing it and losing good sound.
    ~~ GREYTALE NOVASTAR (Writer, Director, Choreographer, Sound Designer, Actor, Saber Designer, Vocal Artist)
    ~~ Balance of Power, EP I: "Into The Lion's Den"
    ~~ Balance of Power, EP II: "Ashes of The Phoenix"
    ~~ The Crystal Focus Sound CD Compendiums... are HERE! ~~
    ~~ Nova & Caine's Staged Combat System... comin' SOON!
    ~~ Crystal Focus Wiring Guide

  6. #6

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    Quote Originally Posted by Novastar View Post
    Thanks guys... I'll be reviewing all this in detail to be sure of what everyone is saying and see about how it differs (or is similar) to what I did for the Flange v3. I tried to give it as much resonance as possible without overdoing it and losing good sound.
    X can tell me to get a life, but the simple (math) way to do it would be to find the average frequency of the most common sound (in this case, the hum), then calculate the 1/4 wave distance to come up with ideal resonance chamber length. In theory, it should give an approximate 7dB increase. That may not sound significant, but a 3dB increase is an effective doubling of sound pressure levels, so 7dB is pretty significant in fact.

  7. #7

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    Quote Originally Posted by lenco12 View Post
    X can tell me to get a life, but the simple (math) way to do it would be to find the average frequency of the most common sound (in this case, the hum), then calculate the 1/4 wave distance to come up with ideal resonance chamber length. In theory, it should give an approximate 7dB increase. That may not sound significant, but a 3dB increase is an effective doubling of sound pressure levels, so 7dB is pretty significant in fact.

  8. #8

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    X can tell me to get a life, but the simple (math) way to do it would be to find the average frequency of the most common sound (in this case, the hum), then calculate the 1/4 wave distance to come up with ideal resonance chamber length. In theory, it should give an approximate 7dB increase. That may not sound significant, but a 3dB increase is an effective doubling of sound pressure levels, so 7dB is pretty significant in fact.
    Unfortunately there is nothing simple about the subject. Besides, quarter wave lengths at those frequencies are a few feet.

    Detailed info.
    http://forums.thecustomsabershop.com...ad.php?t=11537

  9. #9
    Council Member Novastar's Avatar
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    Default

    Sunrider is (pretty much as always)... right.

    I don't know who "X" is, either. But either way... unfortunately sound is (shall I emphasize this again) quite dynamic... especially when it comes to "lightsaber" style sounds, and it's pretty much tough as nails to come up with some kind of simplistic & formulaic "one size resonates all" solution.

    Not that it wouldn't be welcomed if it existed!

    That all being said... some of the tests that Sunrider did with a decibel meter and some experiments have given us some good headway, for sure!!

    Still... sometimes yer kinda "stuck" with a certain solution for a speaker setup. I mean... I know *I* don't have much of ANY kind of room in my (for example) Flange III & IV sabers. So, at this point, I am limited to trying new, and/or different speakers of varying sizes within the limitations of the ID of the area I'm trying to place said speakers.

    FORTUNATELY... I have the ability (in those particular sabers) to use speakers even up to 44mm or 45mm (!!!)... thing is... they aren't always ideal--even despite their size...

    ...response frequencies play a factor...
    ...changing speaker size alters the resonance (of course)...
    ...battery power/draw plays a factor...
    ...in this case, these CFs have the volume POT... which plays a factor into the amount of distortion I can "bear"(?) or quality I am willing to sac for a bit more volume...
    ...changing the volume alters the way the soundwaves behave as WELL...

    ...so... yeah. Basically... sound is super super dynamic.

    Uh... unless you just have like a flat, non-changing "tone" playing. Like say on the emergency broadcast things? You know? Which would be annoying for one thing, and not very useful in a saber, lol.
    ~~ GREYTALE NOVASTAR (Writer, Director, Choreographer, Sound Designer, Actor, Saber Designer, Vocal Artist)
    ~~ Balance of Power, EP I: "Into The Lion's Den"
    ~~ Balance of Power, EP II: "Ashes of The Phoenix"
    ~~ The Crystal Focus Sound CD Compendiums... are HERE! ~~
    ~~ Nova & Caine's Staged Combat System... comin' SOON!
    ~~ Crystal Focus Wiring Guide

  10. #10

    Default

    X can tell me to get a life, but the simple (math) way to do it would be to find the average frequency of the most common sound (in this case, the hum), then calculate the 1/4 wave distance to come up with ideal resonance chamber length. In theory, it should give an approximate 7dB increase. That may not sound significant, but a 3dB increase is an effective doubling of sound pressure levels, so 7dB is pretty significant in fact.

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