forum.zelfbouwaudio.nl

koifarm schreef:

Het is helemaal niet erg om de Ncore niet mooi te vinden, jammer is dat straks een hele horde jou gaat vertellen dat je iets niet goed heb gedaan.

... And you really need to be extremely careful with these things, because a lot of audio equipment is astonishingly sensitive, sonically, to any of this high-frequency noise circulating around power cables, speaker cables, and interconnects.

As a reference, I keep a CD player at home which sounds quite good, but which is fairly typical in its sensitivity to this noise, so I can do listening tests on power amplifiers and switching-mode power supplies to judge whether the power supplies are quiet enough not to disturb the connected equipment. As a rule of thumb, for something that is directly connected to a source, like a preamplifier, the power supply ought to have a measured EMI performance that is at least 20dB, and preferably better than 30dB, quieter than the legal FCC requirements. Simply designing a power supply that complies with FCC class-B is not good enough for good sound quality -- it actually has to drop off the scale of the measuring instrument entirely. Then you can be quite sure that whatever source you are going to connect, it is not going to be bothered by this RFI.

ds23man schreef:

Mmm, voedingskabels die bovenop de uitgangspoel liggen, een luidspreker kabel die bovenop de print ligt...

Mmm, voedingskabels die bovenop de uitgangspoel liggen, een luidspreker kabel die bovenop de print ligt, 220volt las die met slechts een hulsje in de behuizingsprofiel ligt, een 220volt kabel die strak op een voedingsconnector ligt.......