Using an old 4 Ohm loudspeaker to demonstrate my method and procedure to construct a new (loudspeaker) speaker cone (truncated cone/frustum) when a matching replacement cone is not available.

Online resources:
A pattern for a truncated cone - Math Central
Check out the Excel Spreadsheet by Don Nevin.
http://mathcentral.uregina.ca/qq/data...

Cone/Frustum/Truncated cone Calculator
r = r
s = rH
Angle = 360 - A
http://www.hampsonlife.com/conecalcul...

And another great resource where no math or drawing template is required.
https://www.templatemaker.nl/en/cone/

Black Cardstock Paper | Solid-Core Cardstock Paper | Flat Shipping
https://www.cardstock-warehouse.com/p...

Above cardstock also available at Amazon.

Speaker Polarity Tester w/ AD8302 Phase Detector Module
   • Speaker Polarity Tester w/ AD8302 Pha...  

Music attributes:
The 126ers

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#restoreoldradios