Resistor noise on AUDIO applications

Tech Square

Technical and speculative discussion of amps, cables and other topics.

On the link below (a VISHAY "application note" discussing audio noise reduction through the use of Bulk metal foil resistors) bulk metal foil resistors (such as S102, Z201, TX2575, TX2532, etc.) are specifically recommended for audio applications in order to reduce noise:

http://www.ppinyot.com/resistor/vse-an00.pdf

Another VISHAY application note on Bulk metal foil resistors, however, contains this clear, underlined statement:

"THE LEVEL OF THESE TYPES OF NOISE [thermal noise and shot or fluctuation noise] DOES NOT DEPEND ON RESISTOR TYPE (RESISTIVE ELEMENT MATERIAL)"

http://www.vishaypg.com/docs/49991/linearit.pdf

On the other hand, I understand that CONTACT NOISE (FLICKER NOISE), the other type of noise present on resistors, is dependent on resistor material/size and average *DC* current. But most applications of resistors in solid-state audio circuits SEE NO DC.

What's the sense of using these ultra-expensive resistors, then, in audio applications?

Any input on this matter will be greatly appreciated.

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Topic - Resistor noise on AUDIO applications - megalomaniac 18:51:59 11/27/10 (3)

RE: Resistor noise on AUDIO applications - TimFox 14:33:03 08/05/11 (0)

RE: Resistor noise on AUDIO applications - 13th Duke of Wymbourne 17:06:17 12/01/10 (1)

RE: Resistor noise on AUDIO applications - mcgjohn@yahoo.com 18:50:33 01/07/11 (0)

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