Finally getting around to start to tackle this problem it is not the TT or the cart.. I have 2 TT's each with different carts and they both do it one TT is a JVC direct drive with a pickering XV15 cart I was running it through a pioneer SX939 doe the preamp section into the PL400 with that combo when the needlw would land even on the edge of the record the woofers would shake before music even started...
Now I am running a Music Hall MMF7 with a gold ring MC cart through a Caver C-1 preamp into a WOPL400. I want to make my own TT with this new set up it is no where as bad I was able to play a reord at low volume and it was ok but turn it up much and the woofer would go ape shit then that feedback hum would come out... I went to a local lumber yard to see if I could get some type of sound deadening board to layer maybe with foam in between but they had noting at all. I had some 1/2" sheet rock pieces around so just to try it out I cut 2 pieces and put thin foam between the 2 pieces and I had some drum head gel strips here I put under each corner to separate the sheet rock from the shelf top...
I was able to crank the 400 so it was near red lining before I got the humming feed back but this was with the bass backed way off so it looks like I am going in the right direction but I have to find the right board to use.. as a last resort I will make some spikes for the speakers.
