Sounds like when you loosen the head arm connection you are cutting it off from a direct connection of the negative, stifling, resonance that takes place in the arm itself. The cartridge sends micro vibrations down the arm and that arm when locked tight fights how the cartridge wants to vibrate. The principle is like the old Victrolas that used to amplify the needle vibrations into a big horn. So.. You are decoupling the arm (to a degree) that has resonances that fight the cartridge from flowing optimally.
Turntable sounds so much better when...
Hi i have a Pioneer pl-510-turntable and when i loosen the screw about a full turn, at the headshell/tonearm connection the sound is Amazingly better!! The Bass tighter then ever...Highs so crisp and Clear...soundstage much improved...im baffled...??!! I have a Denon DL-110 cartridge..PLEASE help me understand..Thank-you Richard