Fahim Foysal
100+ Head-Fier
I understood the large y axis scale makes the manufacturer fr seem very smooth. How do i make another graph for the zs6 compensating for the lack of a ear canal?Compensation schemes and scale have a lot of effect there. The salient point in a comparison graph is how they differ - which is the sort of useful information you can more universally draw from a FR plot since you don't need to carefully consider the measurement setup (which hakuzen described btw, uncompensated, and you can look up the FR variances on his coupler since it's an IEC standards compliant one).
The graphs being posted here as you can see have about a 50 dB spread on the Y axis - this lets you see what's going on in better detail.
As an extreme example, a lot of graphs manufacturers like to post have a 140+ dB spread so everything looks nice and smooth.