Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

---

[ Follow Ups ] Thread: [ Display  All  Email ] [ Tweakers' Asylum ]

---

[ Alert Moderator ] [ Edit ] [ Delete ]

---

Re: Semantics and wording

209.215.72.242

Posted by Jon Risch on May 23, 1999 at 18:25:03

In Reply to: Semantics and wording posted by Sean on May 23, 1999 at 10:44:26:

Sean,

The crest factor with even heavy rock is at least 10 dB, most classical or jazz or blues is way more, on the order of 16-20 dB worst case. So thw average elvel of the THERMAL heating effects longterm are going to be way down compared to peaks. Due to thermal mass, wires take a while to heat up.

According to Beldens chart in the backl of their catalotgs, a 10 degree C rise in temp from 25 degree C ambeint is for approx. 3.6 amps for 20 gauge wire, 2.8 amps for 22 gauge, and 2.1 amps for 24 gauge wire. Amperage paeks witrh music would be at ten to 100 times that, asumign the system capable of such peaks.

For the 3000 ppm that Dave cites, that would mean a 3% increase in resistance for a 10 degree C rise in temperature. A 35 degree C rise for those three gauges would result from a current of 6.2, 4.8 and 3.7 amps respectively, and that would be a 10.5% increase in resistance, or less than 1 dB of compression. The full amount of compression would only be reached when the wire heated up to it's final amount, and the amount on transients would be much less.

Since power supplies and speaker cable seldom use single 24 gauge strands, the effect of such power related compression is going to be much worse in the loudspeaker than in the wiring, or the PS.

Good pro loudspekaers are doing good to keep compression down to 1 dB or so, and most good home speakers are on the order of 4-2 dB.

Jon Risch

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

Parts Connexion

---

[ 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 ]

---