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Here's one for ya Part 2

So,this am the cartridge plays fine.I do have hum but only when I turn the pre up.No hum with a signal.But what I have now is a horrible case of acoustic feedback.So I took the table down and put a heavy patio block on the wall TT shelf.This has always done the trick with other tables.But I still have acoustic feedback.Come to find out I only have acoustic feedback with the clamp on! I tried it loose,tight still feedback.I tried a rubber puck I have also but still feedback.
With no clamp no prob.I have the Delphi level and set up so when I push down on the platter it bounces 3 times then stops.I was told this was correct.
Any thoughts?
I would like to thank Tom for all his help in my return to vinyl.Thanks Tom (aka TWL)
david99
david99 OP
1,467 posts
 
Sean-Thank you for the information.
The wall the TT shelf is bolted through is load bearing.
The speakers are located 4 feet from the front wall and 2.5 feet from the side walls.
I mentioned the speakers are located 4 feet on each side of the room extention.Not the side walls.
I forgot to mention:
I have a closed stairway on the side of the room that is ~ 3 feet wide by 6 feet long.So ~2/3 of the room is 15' wide and 1/3 is 12' wide.There is a door on the stairs.The right speaker faces the door of the stairs ~ 8 feet away.I have very good imaging and can notice no ill effects from this.
I re-measured the lenght of the room and it is 19 feet long,not 20.
I have bass traps and first reflection point treatment along with corner tunes.
I should have been more precise,Im sorry.
I look forward to you giving me feedback (pun intended) on this information.
Thank you Sean.
sean
6,231 posts
 
David, sorry for the misinterpretation but i was basing my response on your first two posts that you provided here. While it seems as if you're doing the best you can with what you've got and have the basics covered in terms of room treatments, my assesment of the TT feedback / suspension resonance still seems to apply. As such, is it possible to "re-tune" the Oracle suspension in any way ? I am not familiar with this table, so i don't know exactly how it works. I have my doubts about that approach though as i doubt that you could really shift it enough to make a worthwhile difference. Sean
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david99 OP
1,467 posts
 
Thanks Sean-
I'll see if the suspension can be tuned.
Right now its sounding mighty fine but some tweaking is still in order.
I'll let you know.
Dave
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