This makes a similar sound to taping a drive unit cone with plastic surround.
Taping by a finger for example is an approximation to a delta or impulse force function.
It lasts for short time therefore has a large force bandwidth. Heinsenberg's uncertainty principle in acoustics, electric signals etc.
How a material sounds then is a manifestation of their response to this impulse, their impulse response ie to their frequency reponse ie reasonances etc. This applies to linear systems whereas in nature almost nothing is linear. Linearity is only approximated for small signals.
Other examples: Taping a drum produces its sustaining sound.
Similarly taping to a string.
Taping a mass wooden enclosure produces a high pitched tone.
Gently taping a drive unit reveals much of its properties. For example taping a lightweight paper cone produces a quick sound.
Taping the Tesla 5in drive units produces a softer sound possibly due to the complient souround.
Taping a linoleum speaker box produces a soft and easy sound.
Taping a carton speaker box produces a higher pitched sound but not as high pitched as a full wooden enclosure with thick sides.
Taping the Tesla 5in speaker membrane while listing to the back opposite side of a carton enclosure, 8in x 8in x 6in, one can hear some bass coming from this side as it sympathetically vibrates. This has just been tried on the Pleiades Auratone 5C type speaker with this somewhat larger box made of carton.
Trying the same to the 6.5 x 6.5 x (5+3/4) inch^3 Pleiades Auratone 5C type speaker box made from linoleum with a same Tesla 5in fullrange unit as previous example produces less bass at the back side. All sides vibrate with a soft softer sound. Playing music makes the sides vibrate making a softer sound quality than the carton box giving more bass but sounding more harsh.
An Auratone 5C is not available for comparison.
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