Casualmente el otro dia estuve investigando acerca del asunto, y también encontré ésto:
INTERNAL TONEARM DAMPING INSULATION
Cost_$50
This is a Popular Service for NiteClub and Heavy Sound Reinforcement Applications which require additional Vibration Isolation Measures due to Extreme Low Frequency Playback . In these Demanding Applications, Ultra-Low Frequencies resonate back through the Turntable Chassis and get Re-Amplified by the Cartridge and Tonearm, thereby causing LoudSpeaker Rumble in the region below 30hz. This Amplification Loop is extremely difficult to troubleshoot, even for the trained professional, and the result is usually detenuation of Sound Pressure Levels in order to eliminate the situation. Since most High SPL applications require good clean loud undistorted sound, this action is very undesirable. We developed this system to create a solution to even the most difficult of Reverberation Problems you may face in your Niteclub, Bar, or Public Address System. This system is also a popular service for the home studio, or living room concert hall as the damping
action is eliminating the low frequency "arm - cartridge " resonance which in turn will brighten most any speaker system. This also lets the arm mate with a wider array of cartridges providing consistent bass performance. as well as a more solid feel when backcuing and scratching.
dejo el link de la pagina:
http://www.turntabletech.com/sonicmods.htm
Al parecer es una modificación después de la señal recibida de la aguja que elimina la realimentación de las frecuenciaas mas bajas (graves) y evita todos estos problemas de los que hablamos ( no calibra bien traktor, no puedes apretarle al equipo porque se acopla, etc,etc.)
Quizás alguien sepa de que va el rollo y podríamos probar.