@atmasphere
Interesting test, Ralph. Just did it with two test LP's.
The first was a 20-20K sweep on a highly dished test LP. The sound was audible with no amplification from the seating position.
But, with the Analogue Productions test LP, in new condition, bands 6 and 7 generated almost no audible sound, peaking at about 400Hz (Side 1, band 6 is 1K to 20K sweep, band 7 is 1K to 20). This would appear to indicate a good coupling between the record and platter.
But the upper platter is isomolded graphite (GM-10), with a listed hardness of 65psi. This would seem to be notably harder than the vinyl used in LP's - but my interpretation of the data I could find, may be wrong.
What are your views?
Interesting test, Ralph. Just did it with two test LP's.
The first was a 20-20K sweep on a highly dished test LP. The sound was audible with no amplification from the seating position.
But, with the Analogue Productions test LP, in new condition, bands 6 and 7 generated almost no audible sound, peaking at about 400Hz (Side 1, band 6 is 1K to 20K sweep, band 7 is 1K to 20). This would appear to indicate a good coupling between the record and platter.
But the upper platter is isomolded graphite (GM-10), with a listed hardness of 65psi. This would seem to be notably harder than the vinyl used in LP's - but my interpretation of the data I could find, may be wrong.
What are your views?