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physical coupling

#22
Whether it's the foam isolating enclosure vibrations from the stage and thus preventing excitation or whether it's the cab plus foam acting as a mass-loaded damping mechanism acting on the stage, or whether it's a bit of both I don't know, but I do know that sometimes it works!
 
#23
alexclaber said:
Whether it's the foam isolating enclosure vibrations from the stage and thus preventing excitation or whether it's the cab plus foam acting as a mass-loaded damping mechanism acting on the stage, or whether it's a bit of both I don't know, but I do know that sometimes it works!
Click to expand...

Alex, before you get drawn into this debate, please know that Vail is working to draw you into a conflict between himself and Bill that is a carryover from another thread or two, and is part of a larger ‘situation’ you may want to take this into account. Those interactions can be found in a recently closed thread as well as a couple open ones.

http://www.talkbass.com/forum/f15/stage-cab-placement-812281/index16.html#post11566408
 
#24
alexclaber said:
Whether it's the foam isolating enclosure vibrations from the stage and thus preventing excitation or whether it's the cab plus foam acting as a mass-loaded damping mechanism acting on the stage, or whether it's a bit of both I don't know, but I do know that sometimes it works!
Click to expand...
A bit of both. Place a coin on a floor tom drum head, see what happens when you play your bass with the cab close to the drum. Then put a bit of foam under the coin.
Snake oil merchants would have you think that the coin is causing the head to vibrate.
This relates to the speaker spikes popular amongst the oddiophile crowd. Half the spike merchants say that they improve the speaker performance by better coupling the cab to the floor. The other half say they improve the speaker performance by de-coupling the cab to the floor. :confused:
 
#25
billfitzmaurice said:
A bit of both. Place a coin on a floor tom drum head, see what happens when you play your bass with the cab close to the drum. Then put a bit of foam under the coin.
Snake oil merchants would have you think that the coin is causing the head to vibrate.
This relates to the speaker spikes popular amongst the oddiophile crowd. Half the spike merchants say that they improve the speaker performance by better coupling the cab to the floor. The other half say they improve the speaker performance by de-coupling the cab to the floor. :confused:
Click to expand...

But one hundred percent of stage managers and club owners will tell you they hate stage spikes.
 
#26
BurningSkies said:
But one hundred percent of stage managers and club owners will tell you they hate stage spikes.
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I've never seen spikes used on pro-sound gear. They do have one legitimate use, with home theater subs. They help keep them from dancing across the floor, especially a carpeted floor. But as for speaker response, no difference. And as always that's not a guess, educated or otherwise, it's a measured result.
 
#27
billfitzmaurice said:
I've never seen spikes used on pro-sound gear. They do have one legitimate use, with home theater subs. They help keep them from dancing across the floor, especially a carpeted floor. But as for speaker response, no difference. And as always that's not a guess, educated or otherwise, it's a measured result.
Click to expand...

I've seen a few 'custom' cab companies offer them. The one that stands out in my mind is EarCandy, but then their stuff has always had the vibe of audiophile nonsense in the promotion.
 
#28
why not stack them vertically, instead of on their sides? you'll get a little more height that way.

alternately, maybe you could rig up a stable way to stack them that has the top cab tilted back a bit; they'd still be together, but the top cab would be aimed up more towards your ears.
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Click to expand...

Thanks for the suggestion, walterw. I said I was stacking my GS112s on their sides, but I actually meant that I was stacking them vertically (one on top of the other),so we're on the same page. Bad choice of words; sorry for being unclear.

I have thought of angling the top one a bit, but have been a little worried about my LMIII walking off the back of the cab.
 
#29
right; an angled setup would likely require longer speaker cables and the head sitting on a box next to the speaker stack. (unless it was a little class-D head like a benz streamliner, in which case you could just velcro it to the top cab.)
 
#32
walterw said:
Sure; it's all about how close they are to each other, and to boundaries like floors and walls.
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+1

It might "seem like" you're losing a little bass but you're not. You're juat catching more mids/highs in the ear from the top cab being aimed at the head instead of the waist, especially if you're backed up close to your rig, like on small stages. The dispersion pattern hasn't spread out enough to catch your ears when you're standing real close in like that.
 
#34
Just what I need. I tend to eq a little "brittle" when I can't get out front; also, I want to hear those highs - no matter what. The 2 cabs are about the minimum "sail" for this gig and I can't afford to lose much by way of projection and fullness. I have bigger stuff, but then - of course - I'd have to lift it! Thanks again. //m
 

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