Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

---

[ Follow Ups ] Thread: [ Display  All  Email ] [ Propeller Head Plaza ]

---

[ Alert Moderator ]

---

Where is Jneutron when we need him :)

Posted by Tony Montana (A) on October 21, 2004 at 19:54:25

In Reply to: Re: Whether to terminate IC shield to ground with a Cap or not? posted by Jon Risch on October 21, 2004 at 18:00:05:

You said:"As a simple way of explaining it, an overall shield for a twisted pair does not require counter-circulating currents, it acts as an electrostatic shield."

So I guess the question is wether electrostatic shield is as effective as shields that have counter-circulating currents?

An according to the following experiment, answer is probably no...at least for RCA connections.

They did an experiment (in an unbalance system) where they tied power cord to 20 feet of several coax ICs-and Belden 1800F which is a twisted pair with shield, and tested their shielding capability against 60 Hz hum.

They said that coax cables did good, but Belden 1800F used in an unbalance connection performed miserably against 60 Hz hum rejection. Assuming they hard wired the shield to ground for this test, if one end was terminated to ground via a cap, the result [for low frequency rejection] would have been probably worse ;)

Here is full report:

• Hum Rejection in Unbalanced Audio Cables.   (Open in New Window)

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---