Question about Noise Floor

[Claudio]

Hi @Vinylitic. Try reading this post, I think it will be helpful.

Measuring Amp Noise with the QA451 and QA401

This post explains how to measure amplifier output noise using the QA401 Audio Analyzer and the QA451 Programmable Load. Amplifier output noise is generally expressed as an RMS voltage reading in a given bandwidth. Since most finished amp makers are pretty loose with their specs, let’s turn to the silicon vendors as a first point of reference. Below is the spec for the TI TPA3255: [image] Notice they have specified 85 uV, A weighted, with an AES17 filter and the amplifier input grounded. We …