Turntable the cause of speaker cones moving/shudder?

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Tobes

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Hi guys

I need advice please. I noticed that my speaker cones (woofers) are moving at the start of a song and there is no drums or base playing yet, only soft voice. I tested this on my Pioneer amp with the built in phono stage and with the external phono. I also tested this on my Yamaha amp with Yamaha speakers. I even connected the Pioneers speakers on my Yamaha amp. With all these combinations the woofer cones are moving or vibrating or shuddering? It's like they are moving slowly or softly to a frequency you cannot hear (below 10hz) but the song is playing.
Could it be the cartridge?
Stylus?
Motor vibration? There is a slight humming sound when you drop the needle. Table is an AR with Audio Technica cartridge.

Please help  :moron:
 
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