method for determining the length of the TL

Hi everyone.
I found this page online, it's in Italian but just use the translator.
on this page an empty tube is used but nothing prevents you from taking the measurement with a tube filled with fibre. In your opinion, is it possible to use this method to indirectly obtain the exact length of a folded TL?.
Let me explain better, first step, take a measurement on a tube with a purely random length but calculated section. second step, once the exact value of the tube's resonance frequency has been obtained, it is possible to trace the length of the TL which corresponds to the FS of the speaker you want to use and thus build the TL with the right measurements.
what do you think?.hi thanks

https://farelaboratorio.accademiadellescienze.it/esperimenti/fisica/105
 
frugal-phile™
Joined 2001
Paid Member
The length of any TL/quarterwave design is not a single number. It depends onthe alignment the designer is going after.

In theory one could determine the length of the line by measuring the time delay of the signal from the driver to the terminus. This weillbe complicated by any driver offset. It will be easier with no damping and one can get anb idea of the shape/taper by the placement of the harmonics.

Much easier to start with the driver and design the box around it,

dave
 
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