mechanical grounding systems in speaker cabinets

[highfigh]

Sounds like you're trying to do the mechanical equivalent of noise shielding for an electrical circuit. I'm not sure "lively sound" will come from this. If a panel is allowed to resonate, it will color the sound and if it's inert, it won't. You can transfer energy (vibrations) from one material to another but there's no such thing as 100% efficiency.

Not trying to rain on your parade but materials will do what they do, naturally, and wanting to make them do something else is difficult. If you know someone who works in the field of Dynamics, you should consult them.

 

[SB99ACR]

not really. I am very familiar with that process and this is very different.
We would be using very massive metal elements completed an entire circuit causing viboratory evacuation through the easiest path which is the rear spline and front plate. The internal bracing to be attached to the spline and
front plate leading to the base plate. Energy flow is much more rapid through
these elements. I simply am trying an experiment based on established physics which involved creating a relatively resonance free cabinet without
the requiremnent for substantial traditional dampening materials.

Please understand I am not challenging established principles or trying to convince anyone that their way isn't very adequate. I am just trying another approach. Not having a backround in speakers I was just inquiring as to whether this principle was being used at all.

I appreciate all the comments, knowledge and expierience.

 

[WmAx]

not really. I am very familiar with that process and this is very different.
We would be using very massive metal elements completed an entire circuit causing viboratory evacuation through the easiest path which is the rear spline and front plate. The internal bracing to be attached to the spline and
front plate leading to the base plate. Energy flow is much more rapid through
these elements. I simply am trying an experiment based on established physics which involved creating a relatively resonance free cabinet without
the requiremnent for substantial traditional dampening materials.

Please understand I am not challenging established principles or trying to convince anyone that their way isn't very adequate. I am just trying another approach. Not having a backround in speakers I was just inquiring as to whether this principle was being used at all.

I appreciate all the comments, knowledge and expierience.

Okay, so you are trying something experimental, and that is a risk, for the fun of experimenting? I understand that.

If you want to quantify relative differences between different executions, you require an accelerometer. Look up ACH-01 accelerometer and the pre-amp for this device. You will have to make a little metal frame to superglue the sensor to and then use thin layer of wax or, high density double sided adhesive pads to stick the metal frame to the speaker parts. The metal frame will be very low weight, but stiff, and have a large enough flat area to apply the wax or adhesive. A small handle will be beneficial, to let you leverage/remove the item with greater ease. You can not directly apply the accelerometer, or you risk damaging the device, there for it needs a low mass stiff frame.

-Chris

 

[SB99ACR]

Thank you very much for the detailed description.
I will order one right away and attempt to understand the fixture you described. I hope you won't mind if I wright you again with questions once I have the device.

You have been very helpful and I appreciate it!

Chris

 

[SB99ACR]

per your suggestion I have purchased The ACH-10-03 accelerometer
and the Linear X LP201 Preamp.

My question is this.. What is the most resonable way to generate out put

I really would rather not spend $1500.00 on Linear X software right now.
Can you reccomend a less expensive alternative. I am sure as I learn I will use
more capabilities but my main goal now is to check vibration while testing different cabinet systems. Of course it needs to able to out put the data gathered by the LP201 preamp.

 

[R-Carpenter]

Chris, are you using Praxis or did you write your own soft?

 

[SB99ACR]

I think that is what I need to know.

I don't have any software relative to speakers or anyway to graph output signals from the LP201 preamp.

What is the least expensive but accurate way to do this?

Thanks

 

[WmAx]

I use LspLab and run full band sweeps. I don't even think you can still buy that software, though.....

You can probably use freeware like Room E.Q. Wizard, though I have not used this software, but all you need to do here is make sweep or fine increment step sine wave response graphs. The important thing, of course, is to use a SPL meter at a fixed distance, and make sure the output from the speaker itself is the same for each plot, and insure all levels are set the same for input each time to make sure you can compare/overlay graphs accurately. Some people use waterfall plots, but to be honest, these are not telling anything of interest to me for wall resonance. The frequency response is more useful, and you can easily overlay it and correlate (if you are able to plot cabinet response actual SPL vs. driver SPL) to established perceptual research of resonance audibility.

-Chris