distributed resonance, does it work?

[MJ Dijkstra]

Hello to all,

When I read the Electrostatic Loudspeaker design Cookbook, it is clearly stated that multiple drivers with different membrane tension do not distribute the resonances, but air still treats all the different drivers as one big driver with a single hudge resonance. Does this also apply to a mechanically divided esl?

Within the Martin Logan sequel2 , most of the cells have equal dimensions except for 2 cells at the bottem and the top. Does this ML use different acoustic loading of the air trapped behind the esl between the backwards prortuding panels (these panels are angled) ??? And controlling fundamental resonance this way?
Probably the amplitude of the resonance will be relatively low because the relatively high resonance frequency and the large surface area provide acoustical resistance?!

Has someone measured the response of two differently sized panels mounted at a close distance from each other?

Cheers, MartinJan

[jam]

.................there you go.

http://www.soundlab-speakers.com/tech_dr.htm


Jam

[MJ Dijkstra]

Hi Jam,

I've read your link.
It seems (according to soundlab) that there are still individual resonances and not a single large one. For example if soundlab elements have resonances between 100 and 200 Hz, what will happen with a sinuswave tuned at 150 Hz? Because of the individual approach the cell tuned at 150 Hz will resonate while the others will not. This is also clear from the ptcture of soundlab. So this is quite the opposite the way Roger Sanders tells us!

Off topic:
I also have doubts about the resonance behaviour of the soundlabs which have to compromise transient response. I also don't agree with their dispersion charasteristics which can't be smooth from a theoretical point of view.