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In Reply to: RE: What did the mat do other than change VTA? nt posted by volunteer on October 18, 2014 at 19:03:22
According to Rick the SRA setting was what he was having trouble setting. He was unable to achieve the 92 degrees he was attempting. As a result he tried a mat and found that it calmed down the brightness and also increased the bass. My tonearm is an Origin Live modded RB250. He was unable to lower it enough to achieve the angle on the stylus he desired. He felt the mat helped achieve the SRA angle.
I tried with and without the Mat and found that Rick's recommendation worked and worked well. I am not exactly sure how increasing the height of the LP would compensate for the SRA angle. But what ever it did it seemed to work.
Richard
Follow Ups:
The platter/bearing can be raised by turning the "screw" on the bottom of the bearing.
That may be the simplest solution.
What stopped me is the possibility of him having the inverted bearing.
I didn't think the inverted bearing has that adjustment.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
nt
"He was unable to lower it enough to achieve the angle on the stylus he desired. He felt the mat helped achieve the SRA angle."
"I am not exactly sure how increasing the height of the LP would compensate for the SRA angle. But what ever it did it seemed to work. "
Lowering the back of the tonearm or raising the height of the platter (adding a mat) would change the SRA in the same way.
I don't understand why he couldn't lower the back of the tonearm enough.
I assume that with your VPI HW 19 MKIV you have the thicker VPI arm board?
Maybe going to the thinner VPI arm board, or a custom thickness arm board, would have been a solution?
The VPI platter was made to be used without a mat. The vinyl is suppose to be clamped directly to the platter and that system works very well.
A mat, IMO, is a compromise. I would lower the height of the arm board.
Thinking this all the way through, I'm a little surprised that Rick didn't suggest changing the thickness of arm board to get the tonearm at the proper height.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I am not sure why Rick did not suggest that. I appreciate the idea, I think it is an idea worth pursuing.
Thanks
Richard
I think it's good to have options.
Options that can get you back to having the vinyl in direct contact with the platter.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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