They both SAY LE5-6....

[clmrt]

Left cone is considerably darker than the right, but both mags say 5-6.

Someone recone one with another type in the past? Any ideas?

Lesson learned, always buy in pairs. Even if you have a single and the component is readily available, buy a pair and have a spare.

[John W]

It could be that one speaker was placed by the window and got all the sunlight.

[clmrt]

Good point.