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Everything posted by Downunderwonder
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Give it a go. They will explain it another way that may well gel with you. Cab puts out sound waves. Low end energy travels out in all directions = omnidirectional. High frequencies get beamed by speakers toward the front. Very important concept. No reflective boundary = field ( of grass ). Walls reflect bass energy without absorbing much of it. ( The relative amount of bass that passes through compared with treble is a red herring) It's a lot easier to visualize sound as sines which plot pressure at a location over time. Overlay two sines that are identical but half a wavelength out of phase. Sum them at any point, you get zero. Ie they are cancelling one another out. A quarter wavelength is a distance. It is one quarter of the distance it takes a sound wave to complete compression and rarefraction before it is compressing again. V=fĹ Sound travelling two quarter wavelengths has travelled half a wavelength. A quarter wavelength cancellation is a thing you can look up also. It's past my bedtime. It would be well worth your time to get to grips with these concepts as you can head off problems before setting up in a new venue.
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Give it a go. They will explain it another way that may well gel with you. Cab puts out sound waves. Low end energy travels out in all directions = omnidirectional. High frequencies get beamed by speakers toward the front. Very important concept. No reflective boundary = field ( of grass ). Walls reflect bass energy without absorbing much of it. ( The relative amount of bass that passes through compared with treble is a red herring) It's a lot easier to visualize sound as sines which plot pressure at a location over time. Overlay two sines that are identical but half a wavelength out of phase. Sum them at any point, you get zero. Ie they are cancelling one another out. A quarter wavelength is a distance. It is one quarter of the distance it takes a sound wave to complete compression and rarefraction before it is compressing again. V=fĹ Sound travelling two quarter wavelengths has travelled half a wavelength. A quarter wavelength cancellation is a thing you can look up also. It's past my bedtime. It would be well worth your time to get to grips with these concepts as you can head off problems before setting up in a new venue.
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Give it a go. They will explain it another way that may well gel with you. Cab puts out sound waves. Low end energy travels out in all directions = omnidirectional. High frequencies get beamed by speakers toward the front. Very important concept. No reflective boundary = field ( of grass ). Walls reflect bass energy without absorbing much of it. ( The relative amount of bass that passes through compared with treble is a red herring) It's a lot easier to visualize sound as sines which plot pressure at a location over time. Overlay two sines that are identical but half a wavelength out of phase. Sum them at any point, you get zero. Ie they are cancelling one another out. A quarter wavelength is a distance. It is one quarter of the distance it takes a sound wave to complete compression and rarefraction before it is compressing again. V=fĹ Sound travelling two quarter wavelengths has travelled half a wavelength. A quarter wavelength cancellation is a thing you can look up also. It's past my bedtime. It would be well worth your time to get to grips with these concepts as you can head off problems before setting up in a new venue.
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Most used phrases/questions/replies on BC
Downunderwonder replied to roger's topic in General Discussion
Not. Hence the irritation of the pregig announcements that have no value to the vast majority likewise unable to attend Podunk USA gigs in a thread for aftergig reports. -
Jeez, I hope the maker doesn't get sued by that H joker that rhymes with ballbag. Good job keeping under the search bot radar.
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That'll be one punchy mofo.
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Sorry but your poker chip, as elegant as it is, gives the f hole conniptions and makes the chip uncomfortable. You could move it along a little and the symmetry would make both very happy.
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Most used phrases/questions/replies on BC
Downunderwonder replied to roger's topic in General Discussion
Maple Road are playing at... on the ... of next month. Yeah, I'm booking flights right away. -
And refuses to sing Sex is on Fire.
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Horrible noise when removing amp lead from guitar..
Downunderwonder replied to a topic in Amps and Cabs
And if you turn down the input gain first before yanking the amp end out won't even get a pop. -
Low frequencies are omnidirectional. When they hit walls they come back without losing much energy, so much so that we credit it with full energy. That return wave can be in phase well enough to reinforce the original wave when the source is close, or a half wavelength distant from the wall. But at 1/4 wavelength distance the return wave is fully out of phase and you get a cancellation. The original wave headed out from the speaker towards the wall and away from the wall. Having travelled 1/4 wavelength both ways, before rejoining the original, the reflection is half a wavelength delayed ie a cancellation. A bass cabinet in a corner gets all the bass energy focused into 1/2 the space of same cab set along a wall. Go outside and lose half your bass power to the catering area out the back. That's pretty dire! If you look up Allison Effect it will tell you more than you want to know.
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'A' boom is tricky because it's right in the breadbox at 110hz but worth a crack. You probably have walls 6m apart, 2 wavelengths.
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It's aluminum, which is heavy enough in that quantity.
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Pull down 130hz in the PA to tame a boomy C.
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Can "c0ck" please be removed from the swear filter?
Downunderwonder replied to neepheid's question in Site Issues and Questions
"Feck, the feckin fecker's feckin fecked!". Shows it is in fact highly feckin versatile enough to cover exclamation adjective noun adverb and verb in the one sentence. -
Lucky! A ceiling about that height makes an acoustic guitar bloom on every C chord. They will look right at the bass player to blame.
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What makes a song hard or easier to learn?
Downunderwonder replied to Phil Starr's topic in General Discussion
Bassy guitars. -
Dad and the Gang.
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If you are handy with a soldering iron it's pretty easy to make a power cable shorter. Snip out an over lay ie opposing short and long tails, and then trim overall length to suit. Don't forget your heat shrink. Doing it overlayed makes for only one piece of heat shrink required and a nice neat job.
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I'd love a tonic jacket for gigs, if I could find one budgie style in the op shop before some other fashionista snaffles it.
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Save me from myself - possible 1x10 cab build
Downunderwonder replied to tauzero's topic in Amps and Cabs
As opposed to posts joining walls across the cabinet style bracing, BFM style. -
Save me from myself - possible 1x10 cab build
Downunderwonder replied to tauzero's topic in Amps and Cabs
Borrowed mangled English for 'wall' 'joist'. ie thing what stiffens your wall, innit guv! -
Facebook taken over - update re FB Marketplace
Downunderwonder replied to Steve Browning's topic in General Discussion
From what we discussed earlier I think they start by posting as a friend messaging you about some b.s that requires a code. They quickly pose as you to FB locked out or wanting to do admin or sommat, and you are silly enough to give it to them. That's the only way I can see how it could be done short of an actual hack. How they fool you that it's your friend messaging you on some other platform I have no idea. -
I set mine so they WILL clank if I want. 98% of the time they won't, and it's nice seeing heads turn when they do.
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Bass ‘choking’ in the upper register
Downunderwonder replied to Bass Wielder's topic in Repairs and Technical
If not 'ski jump' deformation the easy fix would be a shim under the bridge.
