ESL Efficiency

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#42
No, it does not.
You have to have it deduced by yourself.
From my experience. Alcohol dissolved polyamide leaves dust like residue after drying. Easily removable by cloth. BoPet dveloped at 200 C, while melting point of the Elvamide is 159 C. Are you going to be that careful, who knows. Whether or not melting of the coating by heatgun will provide long lasting layer. Fortunately or not it is more to the proper varnish/paint reciepe than simple mixture of solvent and resin per say. Are you ready to develop one using literature on avail? On the other hand phenol based solution does work due to partial solubility of PET in the former. Coating delamination in quads is a known issue.
P.S. Why are you so hesitant to use proven solution? It surely will cost you but not as much a development of you own or reverse engineering 50 years old technology when carbolic acid was on free avail to begin with.
 
#45
kazap said:
That's interesting thanks. High efficiency with relatively low sensitivity appears contradictory? Perhaps conventional sensitivity measurements don't transfer over to ESL's? Or something else?


Calvin did some in room measurements of his ESL's and got dB levels at the listening position that seemed to equate to Sn~103dB@1W/1m equivalence for an 8ohm conventional driver; assuming data extracted from his post "50W@8Ohms. The last power value translating to ~110dB@4m and beginning of clipping (since the measurement was fullrange the maximum value of SPL above 200Hz is even higher than that!)" can be plugged into Peak SPL Calculator
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Hi everyone, sorry for joining this thread 4 years late.

Perhaps the 110dB at 4m is due to beaming (narrow dispersion)? What is the actual sensitivity for the ESL panel only?
 
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