Combining SPL response and Excess Group Delay in single graph

[satefan]

I have been using REW with great pleasure and it has been my fav tool for acoustic measurements and EQ work etc.

Since a couple of months, i have taken up the challenge of designing a passive crossover (i had only worked with DSP previously). One of the areas I am paying lot of attention to is the fasebehavior of the crossover. The SPL graph and the Group Delay (GD) graph are used a lot to analyze the impact of my modifications.

This made me think, would it be possible to introduce a new graph in REW that combines the SPL response and the excess group delay in a single line. The idea is to keep the SPL curve as is, but use colours to indicate any change in excess group delay. I understand that the information is readily available in the two separate graphs and this should be fine, but I think a coloured SPL line would be very intuitive to use. In fact, it would be great to have such graph for every speaker on the planet :-).

Any thoughts?

Other question is, if such graph can be created in Excel (for example) by exporting the measurements, i don't think the GD data can be exported from REW?

Cheers,

Satefan

Edit: Or, is there an existing grah in REW that does this, that I am simply not understanding well?

 

[John Mulcahy]

There isn't a graph that has SPL and group delay, but you could arrange the main and overlay windows to have both graphs on screen.