ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1]   Go Down

Author Topic: All possible turntable feedback fixes.  (Read 3724 times)

John Chiara

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1148
All possible turntable feedback fixes.
« on: February 02, 2015, 05:34:06 pm »

Sorry, search didn't give me enough. Friend has a basic 2 table DJ setup...mixer and 2 QSC K12's.
He is getting lower freq feedback. Table shoukd be in a foam bottom case.
Thanks.
Logged

Cailen Waddell

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1381
Re: All possible turntable feedback fixes.
« Reply #1 on: February 02, 2015, 05:38:23 pm »

Well, on one show coffin was on top of a twin mattress.  That worked great.


Sent from my iPhone using Tapatalk
Logged

Richard Turner

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 522
Re: All possible turntable feedback fixes.
« Reply #2 on: February 07, 2015, 02:35:57 pm »

Sorry, search didn't give me enough. Friend has a basic 2 table DJ setup...mixer and 2 QSC K12's.
He is getting lower freq feedback. Table shoukd be in a foam bottom case.
Thanks.

http://www.juno.co.uk/products/free-float-deck-stabilizers-black/254042-01/

I've seen anything and everything, suspending tt rig from chains or rubber strap or rigid suspension, concrete block for the table

at a certain point you will get that LF howl feedback no matter what you do if the booth isnt isolated from playback sources.
Logged
Looking at retiring. Local PA market has shrank to 2 guys with guitars and bose l1 compacts or expecting full line array and 16 movers on stage for $300... no middle left going back to event DJ stuff, half the work for twice the pay.

Tim Padrick

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 903
  • Indianapolis
    • T.P. Audio
Re: All possible turntable feedback fixes.
« Reply #3 on: February 12, 2015, 02:08:18 am »

Some of the big euro festivals are using turntable on yoga mat on 1" concrete paver on yoga mat.  Others are using isolators made from 2" tall pieces of 3" or 4" plastic pipe with wide rubber bands crisscrossed over them.
Logged

Rob Spence

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 2958
  • Boston Metro North/West
    • Lynx Audio Services
Re: All possible turntable feedback fixes.
« Reply #4 on: February 12, 2015, 11:19:39 pm »

Low freq feedback from a pair of K12s? Really?
Something else is going on...

Where are the speakers relative to the turntables?


Sent from my iPad using Tapatalk HD
Logged
rob at lynxaudioservices dot com

Dealer for: AKG, Allen & Heath, Ashley, Astatic, Audix, Blue Microphones, CAD, Chauvet, Community, Countryman, Crown, DBX, Electro-Voice, FBT, Furman, Heil, Horizon, Intellistage, JBL, Lab Gruppen, Mid Atlantic, On Stage Stands, Pelican, Peterson Tuners, Presonus, ProCo, QSC, Radial, RCF, Sennheiser, Shure, SKB, Soundcraft, TC Electronics, Telex, Whirlwind and others

Chris Lave

  • Newbie
  • *
  • Offline Offline
  • Posts: 9
Re: All possible turntable feedback fixes.
« Reply #5 on: February 24, 2015, 08:35:30 pm »

    Sorry, search didn't give me enough. Friend has a basic 2 table DJ setup...mixer and 2 QSC K12's.
    He is getting lower freq feedback. Table shoukd be in a foam bottom case.
    Thanks.

    I agree with others' assertions, sounds like something else is going on to get feedback from two K12s, unless proximity wise they are really close.  I’ve been spinning since 1985 and in the old days my needles did feedback on occasion depending on a few things:

    *Speakers facing me (line of sight with turntables), usually caused by subs (120 -70 Hz)
    *Turning up the channel gain too high
    *Anything that absorbed the frequency, such as wooden floors, stages, and tables without something to dampen the transfer of energy (i.e. carpet and/or rubber or plastic feet for table or stage)

    Notably, the phenomena are rare nowadays since the control vinyl most DJs use on turntables is a “noisemap control tone” which doesn’t produce low frequencies.  Also, I DJed last week with an EAW LA 118 less than 5 feet away from my TTs with no issues.  Below are a few possible solutions or viewed another way, causes of hum:

    *Make sure ground wire from TT is screwed into the mixer’s ground screw
    *Some TTs don’t require ground wires with ceramic cartridges, try using a different input on the mixer (i.e. tape/cd)
    *Check the needle’s headshell and cartridge wires, typically 4 wires, should have tight connections
    *Make sure needle cartridge is screwed into tonearm firmly
    *Clean dust from needle and vinyl
    *Replace needle or cartridge
    *Make sure none of the RCA plugs and wires are damaged, bad plugs and other internal TT connections will pickup hums
    *Lastly, evaluate your environment (location of DJ setup, speakers, tables, flooring, etc.), cut frequency that's feeding back

    Hope this helps[/list]
    Logged

    Scott Holtzman

    • Hero Member
    • *****
    • Offline Offline
    • Posts: 5009
    • Ghost AV - Avon Lake, OH
      • Ghost Audio Visual Systems, LLC
    Re: All possible turntable feedback fixes.
    « Reply #6 on: February 24, 2015, 10:55:32 pm »

      I agree with others' assertions, sounds like something else is going on to get feedback from two K12s, unless proximity wise they are really close.  I’ve been spinning since 1985 and in the old days my needles did feedback on occasion depending on a few things:

      *Speakers facing me (line of sight with turntables), usually caused by subs (120 -70 Hz)
      *Turning up the channel gain too high
      *Anything that absorbed the frequency, such as wooden floors, stages, and tables without something to dampen the transfer of energy (i.e. carpet and/or rubber or plastic feet for table or stage)

      Notably, the phenomena are rare nowadays since the control vinyl most DJs use on turntables is a “noisemap control tone” which doesn’t produce low frequencies.  Also, I DJed last week with an EAW LA 118 less than 5 feet away from my TTs with no issues.  Below are a few possible solutions or viewed another way, causes of hum:

      *Make sure ground wire from TT is screwed into the mixer’s ground screw
      *Some TTs don’t require ground wires with ceramic cartridges, try using a different input on the mixer (i.e. tape/cd)
      *Check the needle’s headshell and cartridge wires, typically 4 wires, should have tight connections
      *Make sure needle cartridge is screwed into tonearm firmly
      *Clean dust from needle and vinyl
      *Replace needle or cartridge
      *Make sure none of the RCA plugs and wires are damaged, bad plugs and other internal TT connections will pickup hums
      *Lastly, evaluate your environment (location of DJ setup, speakers, tables, flooring, etc.), cut frequency that's feeding back

      Hope this helps

    Like a microphone feeding back you should be able to "ring out" the config and equalize out the offending frequency. 
    Logged
    Scott AKA "Skyking" Holtzman
    River Delta Audio is now:

    Ghost Audio Visual Solutions, LLC
    Cleveland OH
    www.ghostav.rocks
    Pages: [1]   Go Up
     


    Page created in 0.056 seconds with 22 queries.