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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

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wilson667 OP
93 posts
 
Zd542 My phono pretty is am Avid Pulsus and is set to 47000 k ohoms and a capacitance of 100pf.
Johnnyb53 I am not sure that I want to add a headshell weight. It sounds like you are saying adding a weight of about 13 to 18 grams.that seem like an awful lot of weight to add.
Stringreen unfortunately I don't believe the damping is an option on this arm.I am not sure the stand is the problem but I am going to try moving the table and see what happens.I think there are some pics of the stand in my system page although most everything else has changed. The stand its self is near 150 pounds and not as flexy as the name would give the impression.
I am kind of starting to think it is just not a good match to the arm. I thought I saw a few threads of folks with it on the same arm but I could be wrong
wilson667's avatar
wilson667 OP
93 posts
 
Hey Johnnyb53
thanks for pointing that out I totally grazed over adding the weight of the cartridge to the calculation.Is there any way to see if the added weight will work perhaps a penny and some blue tack? Another thing has got me confused Audio-Technica does their compliance calculations at 100hz and not 10hz as the calculator calls for. I have no idea how to do the conversion to the 10hz number that is required.
Andrew9405
It is not very helpful in solving my problem to tell me the arm is not very good. It is what I have to work with. I don't want this to devolve in to a debate about how good the arm is or is not.
Zd542
I did say [http://www.tnt-audio.com/clinica/flexye.html]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.
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