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01-30-2013, 07:04 PM
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Originally Posted by creis2  Thread derailed. Adios. | Aw come on, essentially the same post was made at #33, you didn't mind then. Laugh a little. I hope this issue gets sorted and you didn't already place an order to Auralex... 
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What you do today is important, because you are trading a day of your life for it. Tech/Eng. club- #0x000C, T-Bird #300 Vinyl Spinner 5
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01-30-2013, 07:16 PM
| | | | I agree that the cab flex is the issue here. Cargo strapping the amp to the cab is going to transfer all that low frequency vibration to the amp chassis. It won't fall off but it's going to test the components in the head.
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Mediocre Bassist#477
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01-30-2013, 09:46 PM
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Originally Posted by chuck3 | Might I point out, those are Cowboys Cheerleaders. Because TEXAS is the best state.  |
01-30-2013, 10:00 PM
|  | Registered User | | Join Date: Nov 2008 Location: Lake Havasu City, Az USA | | You could find a picture of? 
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Just call me B-String 2
GK Club #488 Big Cabs #175 Peavey Amps #92 50+ Club #44
Originally Posted by beans-on-toast
I told my manager that I wanted a regular gig. She told me to try prune juice.
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01-30-2013, 10:21 PM
| | Registered User | | Join Date: Aug 2007 Location: Sacramento, CA | | Maybe if you turn the cab upside down and use its bottom as the top, the head will be pulled down and made more stable instead of levitated. 
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Hollowbody Bass Club #121, Hondo Club #002, Official Short Scale Bass Club #018, Short-Scale Six-String Bass Club #001, Epiphone Club #010, can't recall what other clubs I'm a member of here...
Last edited by lunarpollen : 01-30-2013 at 10:24 PM.
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01-30-2013, 10:23 PM
|  | Registered User
Authorized fEARful/FEARLESS/greenboy designs builder | | Join Date: Mar 2011 Location: Nashville, TN | | Quote:
Originally Posted by lunarpollen Maybe if you turn the cab upside down and use it's bottom as the top, the head will be pulled down and made more stable instead of levitated. | That's right Newton...that just happened! |
01-30-2013, 10:28 PM
| | Registered User | | Join Date: Aug 2007 Location: Sacramento, CA | | | I wonder, would sticking globs of Blu Tack to the feet of the head keep it from sliding for now?
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Hollowbody Bass Club #121, Hondo Club #002, Official Short Scale Bass Club #018, Short-Scale Six-String Bass Club #001, Epiphone Club #010, can't recall what other clubs I'm a member of here...
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01-30-2013, 10:28 PM
| | Registered User | | Join Date: Aug 2011 Location: Dallas | | Quote:
Originally Posted by 5StringThunder Might I point out, those are Cowboys Cheerleaders. Because TEXAS is the best state. | Represent Dallas! Even though I don't even like football, I still have to love home!
__________________ Quote:
Originally Posted by musicman666 It's the Tone Gnomes I tell ya !! | |
01-30-2013, 10:51 PM
|  | Less barking, more wagging! | | Join Date: Jul 2006 Location: San Diego, CA | | | Down and dirty way to locate new braces:
Use a pair of headphones, or small loudspeaker, as a "reverse-stethoscope" to find out which part of the cabinet is vibrating the most.
Play a C# into the 'phones and hold an ear-cup against the cab while sliding it from place to place. When the headphone "excites" one part of the cabinet more than another, add a "spring" brace and see if it mitigates the problem. |
01-30-2013, 10:55 PM
| | Registered User | | Join Date: Aug 2009 Location: New Zealand | | | Play the C# with salt sprinkled on the cab top.
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Team Trace Elliot #1, Mediocre Bassist #399, Old Basstard #86 Kala U-Bass #22
Swamp Kauri custom 5str. Stagg EUB. Krappy 5er FL.
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01-31-2013, 01:28 AM
| | Registered User | | Join Date: Sep 2007 Location: USA | | Quote:
Originally Posted by Downunderwonder Play the C# with salt sprinkled on the cab top. | Ding ding ding... Knowing the mode of vibration at C# would help identify the under-braced area. Credit also to Foz for dropping a clue earlier. |
01-31-2013, 08:36 AM
| | Registered User | | Join Date: Jan 2013 Location: Las Vegas, NV | | Quote:
Originally Posted by foderaman I just can,t resist! Play a Db instead. | ****! He's right!!!
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GK1001RB-Mk.1, Ampeg 215 cab, '78 Fender P-bass w/ Passive Bartolini's x 2
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02-01-2013, 02:03 PM
| | Registered User | | Join Date: Jul 2008 Location: Jax FL USA | | | Any pics of the inside of the cab / reports on details of the cause? |
02-04-2013, 01:14 PM
| | Registered User | | Join Date: Nov 2011 Location: Cambridge, MA | | | Since the cab has stuffing (or whatever you call it), there's no point in taking a picture.
I've been meaning to call Don, but I have a flu that won't quit. |
02-04-2013, 02:21 PM
|  | Registered User | | Join Date: Feb 2008 Location: Madison, WI | | | That's crazy, I can't believe how much that head jumps in the video. |
02-04-2013, 02:26 PM
| | Registered User | | Join Date: Apr 2012 Location: Orange County California | | Quote:
Originally Posted by lokikallas Get a slice of dynamat to put under the head. | Yep - this is it |
02-04-2013, 02:33 PM
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Originally Posted by lustersilk Yep - this is it | No, it's not. Please read the entire thread.
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What you do today is important, because you are trading a day of your life for it. Tech/Eng. club- #0x000C, T-Bird #300 Vinyl Spinner 5
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02-04-2013, 02:45 PM
|  | Registered User | | Join Date: Feb 2012 Location: Spartanburg, SC | | | Put the cab on top of the SVT, problem solved.
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Ampeg Portaflex Club #259
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02-04-2013, 03:05 PM
|  | Registered User | | Join Date: Sep 2003 Location: Lakewood Colorado | | | Everytime I read this thread title I think of an SVT bouncing around like tumbleweed. I know... it's just me.
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Jon Bassman
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02-04-2013, 04:11 PM
|  | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | I do not think that extra bracing in the cabinet will fix this issue. You are dealing with mechanical resonance. When the cabinet is built and constructed; it will have it's own resonant frequency, much like a wine glass has a resonant frequency which when played loud enough will break the wine glass. A cabinet can have its own resonant frequency which when played will cause the entire cabinet to move around. http://en.wikipedia.org/wiki/Mechanical_resonance
The bracing would make the enclosure more rigid but would do nothing much to change the mechanical resonance of the entire system. I agree this is not exactly a perfectly functioning cabinet since it has this tendency to mechanically resonate at frequencies that the bass guitar reproduces; but bracing will not fix it is my theory. Changing the mass of the speaker cabinet (which is functioning as a complete system given the speaker is acting as a spring) will be the only way to change this. Setting an SVT on top does not count as changing the cabinet mass. Thicker wood throughout would. The whole point is that the mass change has to happen in the system and not what is put on top of the cabinet.
Wine glass breaking with sound: http://www.youtube.com/watch?v=17tqXgvCN0E
I'm just not certain that bracing will change this behavior unless you can show the cabinet is itself vibrating. http://www.youtube.com/watch?v=3mclp9QmCGs
Mechanical Resonance caused the failure of the Tacoma Narrows Bridge.
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Last edited by joelb79 : 02-04-2013 at 04:19 PM.
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