When restoring old speakers you often need to refoam the units.This should be done with a 50hz sine curve which centres the driver inside the coil.
Signor is a frequency generator app that helps you refoam old speaker units addressing exactly this issue.
https://andro.io/app/signor
Power 100
Android app profile
Signor for Android – Latest Version & Features
by Palmarium
★★★★★
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> 2.2k
Monthly Downloads
~$900
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