Dear fleib: """ A unipivot maintains stability by the distribution of mass and the center of gravity in relation to the pivot. .......... If the center of gravity is too low or high, it will be unstable. """
Weight or no weight during playing stability is not mantained:
a friend of mine that is a scientist and was the director of science area in the principal of México universities and that works for the NASA and today is working somewhere in Asia has three hobbies:
first how the Universe born?, live music and home audio system to listen music.
One day I received a call from he to invite me the Sunday of that week to one of the University science laboratory and that’s the only information he gaves me.
I attend to and he brought his TT with two mounted tonearms ( the one that uses I seen at his home. ) and 3-4 LPs and our meeting main target was to observe through an electronic microscope the cartridge ridding on the LPs at microscopic level ( I only seen that through internet latter on. ), I was really exited to see it for the first time in my life live.
Everything started and through a screen I seen those LP groove modulations in macroscopic way even at normal speed and in low and very low motion.
Both very well regarded tonearms and cartridges ( but diferent in between. ). We were seen it different kind of track modulations including the 1812 overture and was amazing to see what really happen there when the cartridge is " fighting " against those modulations to ridding it.
Well, suddenly I noted/observed that in one of cartridge/tonearm combinations exist a very especial kind of minuscle motions when seen in low motion status through the micro screen and I told to my friend and as a researcher he wanted to " investigate " what could be happening in that combination and over some tests/views that he runned we took in count that those minuscle motions were coming from the tonearm pivot. Then he did it the same tests with the other cartridge combination and had not those minuscle motions. This combination was with a gimball tonearm and the other was an unipivot design.
I don’t took this in count was only an experience and I bought unipivots tonearms additional to the pivoted ones but " today " that " old " experience was and is a learning one.
What produce that to low or high center of gravity in any pivoted tonearm design is that the cartridge could starts to mistracking.
""" The difference between bearing friction and high inertia is in the type of resistance to movement. Effective mass and inertia are the same. """
everyone knows that and as many times happens my meaning was not to ask that
""" Neither the DP8 or 507 II are unipivots. They both use high mass (inertia) in the horizontal plane to optimize tracking and bass response """
I can’t speak for the DP8 but for the 505/507 and I can tell you that the bass response is not up to the quality level in other more " simple " tonearm designs. So, for me is a faulty design, not a bad one because nothing is perfect but maybe you can tell us the 505/507 first hand advantages through your experiences.
Btw, all your posts comes to tell you disagree with my experiences/opinions but with no better solutions to.
The three ( 3 ) questions I did it to you are in stand by by you with no single answer.
Now, please tell us your overall solution to wrm ( op ) and why that solution is better than mine.
Why your solution or solutions meets better the cartridge needs? WHY?
I hope that sometime you can answer about.
If you decide don’t post your answers is useless and futile you go on and on " over " me because you share no real contribution to help.
Good luck.
Regards and enjoy the music,
R.
Weight or no weight during playing stability is not mantained:
a friend of mine that is a scientist and was the director of science area in the principal of México universities and that works for the NASA and today is working somewhere in Asia has three hobbies:
first how the Universe born?, live music and home audio system to listen music.
One day I received a call from he to invite me the Sunday of that week to one of the University science laboratory and that’s the only information he gaves me.
I attend to and he brought his TT with two mounted tonearms ( the one that uses I seen at his home. ) and 3-4 LPs and our meeting main target was to observe through an electronic microscope the cartridge ridding on the LPs at microscopic level ( I only seen that through internet latter on. ), I was really exited to see it for the first time in my life live.
Everything started and through a screen I seen those LP groove modulations in macroscopic way even at normal speed and in low and very low motion.
Both very well regarded tonearms and cartridges ( but diferent in between. ). We were seen it different kind of track modulations including the 1812 overture and was amazing to see what really happen there when the cartridge is " fighting " against those modulations to ridding it.
Well, suddenly I noted/observed that in one of cartridge/tonearm combinations exist a very especial kind of minuscle motions when seen in low motion status through the micro screen and I told to my friend and as a researcher he wanted to " investigate " what could be happening in that combination and over some tests/views that he runned we took in count that those minuscle motions were coming from the tonearm pivot. Then he did it the same tests with the other cartridge combination and had not those minuscle motions. This combination was with a gimball tonearm and the other was an unipivot design.
I don’t took this in count was only an experience and I bought unipivots tonearms additional to the pivoted ones but " today " that " old " experience was and is a learning one.
What produce that to low or high center of gravity in any pivoted tonearm design is that the cartridge could starts to mistracking.
""" The difference between bearing friction and high inertia is in the type of resistance to movement. Effective mass and inertia are the same. """
everyone knows that and as many times happens my meaning was not to ask that
""" Neither the DP8 or 507 II are unipivots. They both use high mass (inertia) in the horizontal plane to optimize tracking and bass response """
I can’t speak for the DP8 but for the 505/507 and I can tell you that the bass response is not up to the quality level in other more " simple " tonearm designs. So, for me is a faulty design, not a bad one because nothing is perfect but maybe you can tell us the 505/507 first hand advantages through your experiences.
Btw, all your posts comes to tell you disagree with my experiences/opinions but with no better solutions to.
The three ( 3 ) questions I did it to you are in stand by by you with no single answer.
Now, please tell us your overall solution to wrm ( op ) and why that solution is better than mine.
Why your solution or solutions meets better the cartridge needs? WHY?
I hope that sometime you can answer about.
If you decide don’t post your answers is useless and futile you go on and on " over " me because you share no real contribution to help.
Good luck.
Regards and enjoy the music,
R.