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Is the at 150mlx a bad match on the jmw9 tonearm

I am asking because I just installed the at150mlx on my vpi scout 1.1 and am getting woofer pumping. I had a ortofon 2m blue before this and had no pumping. The table is on a flexy style stand with 4 butcher block shelves and a laminated top shelf of 1/2" acrylic ,1/2" aluminum, 1/2" acrylic. The table sits on the top shelf on top of a sand box. The stand is spiked into carpet on a concrete slab. It is located about 12' away from the right speaker behind the listening position. I am not sure what other information would be helpful but it seems to happen at normal listening levels( slightly louder than conversation).If it is a bad match I would like to figure it out ASAP and return it for something else. Thank you for any help.
wilson667

Showing 3 responses by zd542

zd542
5,339 posts
 
Did you change the settings on your phono stage to what the specs call for on the new cart?
zd542
5,339 posts
 
"09-19-15: Stringreen
What doesn't look right to me is flexistand? Don't know what that is, but VPI's don't like flex."

Look at the pic of his rack. I think he meant plexy not flexy.
zd542
5,339 posts
 
"I did say [www.tnt-audio]flexy[/url] It is not quite the flexy stand outlined by tnt audio with only three legs it is more like a salamander nock off it has 4 legs and i used salamander's points for the feet.it is a very solid stand.
Wilson667 (System | Threads | Answers | This Thread)"

I see it now. The top shelf looks like plexiglass, so that's where I got the idea from. I have 2 Scouts and one of them is on a stand similar to this. Its one of the ones that Michael Green designed and sold through The Cable Co. I've never had any problem like this with either one. The only real difference I can see is that I use lower output MC carts, but I don't see why that would make a difference. Of all the answers so far, Johnnb53's seem to be the most plausible.
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