LTSpice plotting of crossover filters - question

[TAJ]

I am just goofing around learning LTSpice. This is not a real project, but it's certainly a real puzzle (for me at least).

I created a simple L-R 2nd order crossover schematic and plotted the individual filter outputs with success (wuhoo!) See pics.

But I cannot figure out how to plot a summed result. I understand 2nd order filters need a polarity reversal at one output to sum properly, and that's what's probably giving me the grief. Everything I try gives me completely unusable results. I've tried putting the midrange's filter components on the ground side. I've tried using a separate signal source for the mids with reverse polarity, ...

Has anyone done this before and can show me the err of my ways?

Thanks!
..Todd

[feyz]

But I cannot figure out how to plot a summed result

You need to add a trace manually, from the top of my head right clicking on the plot area or where the current trace names are and then selecting add trace. Then type in the sum you want, like V(woofer) + V(tweeter). If you want phase reversed you type minus like V(woofer) - V(tweeter)

[TAJ]

Oh! It worked. Thank you feyz.

It never occurred to me to do it in the plot window. I was trying to wire up a sum on the schematic and plot its output.

Thanks!

..Todd