R/E/P Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1]   Go Down

Author Topic: What causes low frequency bumps in vinyl record playback.  (Read 5319 times)

Thomas W. Bethel

  • Sr. Member
  • ****
  • Online Online
  • Posts: 331
  • Real Full Name: Thomas W. Bethel
  • When only the best will do.
What causes low frequency bumps in vinyl record playback.
« on: July 18, 2014, 09:14:55 AM »

If you look at a vinyl record playback on an oscilloscope set for phase display certain records cause the display to jump vertically. If you filter out any information below 20 Hz by using a high pass filer the oscillations pretty much go away. These bumps seem more noticeable on records that were not made by main stream record companies. I am wondering if this is due to a lathe that has bearing problems or a platter that is not true on the lathe or if these bumps are caused in the plating or pressing of the record? Any help in learning about these would be most welcome.

Thanks in advance!
Logged
Thomas W. Bethel
Managing Director
Acoustik Musik, Ltd.
http://www.acoustikmusik.com/

Doing what you love is freedom.
Loving what you do is happiness.

Celebrating 29 years in business in 2024

When only the best will do...

Greg Reierson

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 74
Re: What causes low frequency bumps in vinyl record playback.
« Reply #1 on: July 18, 2014, 10:50:04 AM »

All of the above. It would take a close inspection of the vinyl to give clues and even then you may never know the cause. Can you post a sample?
Logged
Greg Reierson
Rare Form Mastering

dany500

  • Newbie
  • *
  • Offline Offline
  • Posts: 1
  • Real Full Name: Dany Brown
Re: What causes low frequency bumps in vinyl record playback.
« Reply #2 on: October 10, 2014, 05:05:26 PM »

It would take a nearby investigation of the vinyl to give pieces of information and still, after all that you might never know the reason. Can you post a specimen?
Logged
We are the pioneers in providing   1z0-051  and SAP  exams with 100% exam pass guarantee.

polypals

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 53
  • Real Full Name: Paul Kirchhoff
Re: What causes low frequency bumps in vinyl record playback.
« Reply #3 on: October 10, 2014, 06:41:12 PM »

The quality of the lathe used to cut the record may certainly be part of the problem.

Do not rule out external influences at the time the record was cut.

On a number of the famous Decca SXL series of classical music low frequency noise can be traced that is caused by London Transport.
The cutting rooms were located in a building close to a bus line in London.
Logged

aleeza

  • Newbie
  • *
  • Offline Offline
  • Posts: 1
  • Real Full Name: asdf qwe
Re: What causes low frequency bumps in vinyl record playback.
« Reply #4 on: December 30, 2014, 01:27:07 AM »

nice and good post
Logged
Usman

ericp20

  • Newbie
  • *
  • Offline Offline
  • Posts: 1
  • Real Full Name: eric paul
Re: What causes low frequency bumps in vinyl record playback.
« Reply #5 on: May 04, 2015, 08:25:24 PM »

too interesting, very good
Pages: [1]   Go Up
 


Site Hosted By Ashdown Technologies, Inc.

Page created in 0.047 seconds with 23 queries.