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In my experience, you rarely wire speakers in series. The most common time to do this is on subwoofers with dual voice coils when you are trying to acheive a specific load for an amp.

In most...

I have their older version of cans, and YES the hollow points will fit because that is what I upgraded mine too.

Why not run them at 2 ohms? Most every amp can handle 2 Ohm stereo no problem, and you can get more out of your amp. I have these same speakers on my tower and they do need some juice to hear them...