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Loud thud heard through speakers

Noticed a weird sound while listening to music today. A loud thud through the speakers during loud vocal passages. I'm not sure what's causing it but happened twice and on different records. One was Muddy Waters Folk Singer and the other Dire straits Brother in arms. 

Amplifier: Graaf GM50BSpeakers: Wilson Benesch ACTSubwoofer: Sumiko S9
At this time I'm not sure of it's the Sub or the Speakers. Did anyone experience anything like this before?


livin_262002
livin_262002 OP
184 posts
 
Ok, narrowed it down to the Sub. The noise is not coming from the speakers but from the Sub. Not sure why the Sub is popping so loud during loud musical passages even though there's hardly any low frequency information at that moment.
cal3713's avatar
cal3713
1,421 posts
 
You need to better isolate your turntable. You're almost certainly getting bass rumble or feedback. If you post a modified version of this question over in the analog area you'll get a ton of information about how to overcome the issue. 
livin_262002 OP
184 posts
 
@cal3713 Thank you for the suggestion. I'll try playing same tracks from a digital source today and see if I can induce the pop. If there's no pop then as you said it could be a problem in my analog chain.
livin_262002 OP
184 posts
 
Update. It was bad buffer tube in the phono stage. Replaced the tube and all is well now.
cal3713's avatar
cal3713
1,421 posts
 
Great news. Much simpler than my guess. 
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