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In Reply to: RE: target arm/cartridge resonance when playing 78s? posted by Tre' on May 27, 2017 at 11:00:26
The requirement is for the LF resonance to be at least one octave below the lowest audible frequency, not with respect to what is cut in the groove so having the LF resonance at 14Hz in the Technics 12g arm as John calculated is perfectly fine irrespective of the record speed. Any higher and you may start getting other arm related issues becoming an issue.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
Follow Ups:
"For best performance, the tonearm and cartridge must be matched. All cartridges will not work with all tonearms, and vice versa. To insure a proper match, one must be aware of the mechanical specifications of both the arm and phono cartridge. To see how these characteristics interact and determine compatibility, we must first understand the dynamics of the relationship.Any cartridge/tonearm combination will exhibit resonance at a specific frequency (or frequencies). This resonance is due to the interaction of the cartridge (acting as a spring), and the weight of the arm (acting as a mass). The "springiness" of the phono cartridge is described as compliance, the weight of the arm is specified in mass. As an example, a heavy weight on a light spring would obviously over-flex the spring, conversely, a light weight on a strong spring would not allow sufficient flexion.
At resonance, the arm/cartridge combination produces a dramatic rise in output. An increase of 3 to 6dB or more is common. This tremendous boost can cause severe problems if it occurs in the region of recorded music (above 2OHz), or in the area where record warps and rumble are problematic (below 5Hz). A cartridge/arm whose resonance occurs in the region above 20Hz can be influenced by music on the record. At this frequency a significant jump in output (resulting in a "bloated" or "tubby" sound) will be experienced. In extreme cases, the stylus may actually jump out of the groove. Similarly, a cartridge/arm combination that exhibits a resonance below the desired range will exaggerate the effects of record warps, or rumble produced by the turntable."
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/04/17
All valid points but in this particular situation, not the full explanation for the sound of the DL301 in my 12g (Technics) arm.
I use fluid damping and my DL304 has a very flat response all the way up from the presence band to the upper HF band. It has a higher compliance to the highest of the two DL301s I have, but has different damping characteristics so perhaps that is the main difference.
I happily use higher compliance MMs such as the Shure V15V/SAS and Pickering D4000 which don't exhibit the same trend in the frequency response which leads me to think that the DL301 response is a deliberate voicing. Don't get me wrong, it's not "bad" sounding! Just that in my system it requires EQ in my recordings to restore correct tonal balance.
BTW thanks for the link! Very handy :)
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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