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An analysis of turntable rumble (URL link)

johmbolayajohmbolaya 4,472 Posts
edited October 2005 in Strut Central
It's very technical, but for those who know how to fine tune, it's worth reading and bookmarking.http://www.hydrogenaudio.org/forums/index.php?showtopic=37509
  • Rumble extends up to about 20hz for L+R, and 34-50hz for L-R.
  • The actual audio signal extends down to 20hz for L+r and possibly as low as 40hz, and definitely at least 70hz, for L-R. This contradicts some people's statements that bass is summed below 140hz.
  • There are 0.55hz (or 33.3 rpm) harmonics extending fairly well into audio frequencies, although they may be too small to be worth filtering out. These harmonics exist in both L+R and L-R channels.

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