Home Vinyl Asylum

Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

RE: My point -

The effective mass of any tonearm is simply its moment-of-inertia about its pivot point divided by the square of its effective length. The difficult part is determining a tonearm's moment-of-inertia because its mass distribution is so nonuniform. The only accurate way to determine its moment-of-inertia is to measure it.

The advantage of effective mass is that it allows us to compare the inertia of different length tonearms directly whereas their moments-of-inertia are not directly comparable. Two different length tonearms having the same effective mass will react identically with cartridges of the same mass and compliance; however, their moments-of-inertia will be different. The longer tonearm will always have a larger moment-of-inertia than the shorter tonearm even though their arm/cartridge resonance frequencies will be identical when using the same cartridge.

Best regards,
John Elison

This post is made possible by the generous support of people like you and our sponsors:
  Parts Connexion  

Follow Ups Full Thread
Follow Ups


Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.