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In Reply to: RE: Shield material effect on sound posted by thom70 on February 04, 2008 at 04:37:29
Hi.
Shielding adds shunt capactance to the signal.
For a single conductor coaxial with a round shield, C=7.36e/log10 (D/d) pF/ft, wherer e is the dielectrical constant of the insulation used on the wire. Foamed PE is lowest, next to free air/vacuum, & followed by Teflon (FEP, TFE, PTFE). PVC is the worse among the common insulation dielectric used for wires. The formula also shows the distance btween the conductor & the shield affects the capactance of the cable.
Assuming it is a twisted pair, with an overall shield, braid or foil regardless, the shunt capacitance due to the overall shielding will be increased by the capacitance between the pair of conductors.
It will cause RF roll off if the cable is too long & the sonic effect will be compressed & lack of live to the music.
A proper twisted pair of conductors of equal gause size & same identical construction, even without shielding, can be effective vs RFI inductive coupling up to 1MHz. It is because the RFI noises picked up in one twist will be cancelled out in the next twist downstream.
All the 4N silver ICs I DIYed for my rig & for my audiophile friends are all twisted pairs but UNshielded. This includes the crucial pair linking from my TT to my tube & SS phonostages.
No noise, no hum & sound very dynamic & tranparent! Shileding, IMO, is a sweet poison to the sound.
c-J
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