Matthew J Poes
AV Addict
Thread Starter
- Joined
- Oct 18, 2017
- Messages
- 1,903
everything over a 6th harmonic looks clipped. Why is that?
Are you referring to the flattening of the harmonics as they approach their frequency limit? That is due to limiting the boost applied by normalisation to 30 dB in the distortion controls, the rise is due to boosting of the noise floor as the level of the fundamental drops.
An easier way to narrow in on rattles or resonances is perhaps to use the sine generator's 'Frequency tracks cursor' option and slide the cursor about on the graph as you listen for them.
Listening position distortion measurements can show up clipping somewhere in the signal chain, or over-driven subwoofers or faulty drivers and the like, so it is worth scanning the distortion plot when a measurement is made. All would show up more clearly on a near field measurement if there is an issue to investigate.