well, the MM series polks are 2.7 ohm, so two pairs would make a nice wide 4ohm load wired in series
the 4ohm load is said to be much quieter on that amp.
other note: UM have fixed bezels and are harder to fit on bike and some huge assed magnets
the black MM651's with the tiny neo magnet's are the ones you want, think
wired in series is the scary one where you cross wire one positive on one speaker to the negative of the other speaker, then run the opposing leads, + and minus from the two separate speakers to the amp.
not scary, just one of those things, I always check the speaker load before just trying it out with a ohm meter
you do get a louder output wiring in parallel, usually, but depends on what you have in parts, in the case of the MM series, they're throw a 1ohm load and more than likely sound really good for about 10 minutes and then the amp would cook.
2010 FLTRX- r o a d g l i d e
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