SDA 2A question

I fired up the speakers the other day and there was an echo. Almost like one speaker was lagging just slightly behind the other in sound output. I tried a few different tracks and had the same thing so I shut them off to make sure I didn't damage them.
I went and started search for an SDA echo but didn't find anything that answered my question as to why. I did verify that my Onkyo 876 receiver is a common ground. The negative terminals are at .3 ohms. I also verified all my connections.

I fired them up today to try a few different tracks. I started with the same song I started with when I had the echo and it was gone. I am definitely not complaining but still curious. Any insight would be appreciated.

Thanks,
Steve

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