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I'm in the process of setting up my 2012 210's stereo. I pulled the stock Polk speaker out of the gunnel to double check the model number so I would know the impedance. I guess there are some boats that ship with the Polk MM 651 and others that ship with the Polk MM 651 UM. According to Polk's site, the UM version's impedance is 4 ohms, while the non UM is 2.7ohm. The back of my speaker lists the model as "MM651 UM"; however, it says "3ohms / 100W" under that. To further confuse me, the speakers look just like the non UM version on Polk's site; however, I was told that Polk makes the UM version in black as a special order for Nautique. Can someone shed some light on this for me? Do I have the non UM version? Is the speaker's true impedance 3ohms, 2.7ohms, or 4ohms? I am hoping to run these in parallel, but I won't be able to if they are anything less than 4ohms. Thanks.
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The simple answer is to obey the manual. The slightly less simple way is to get a multi meter and check the ohms yourself. -
I don't have an owners manual; however, the owners manual on Polk's site for the MM 651UM (which is what the label on the back of the speaker says) states a nominal impedance of 4ohms. The speaker itself just says "3 ohms". My multimeter says 3.1-3.2. From what I gather, this reading is not a true measure of impedance, it is resistance, and it may not line up with the speakers nominal impedance as stated by the manufacturer. I am thinking that it is a 4ohm speaker, and it will be fine to run in parallel to a 2ohm stable amp, but I am just hoping someone has some insight before I destroy my amp. The amp I am hoping to run to is the Polk D4000.4.Comment
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yes, they are an odd ball impedence at 3 ohms.
They are designed to be run 3 in series on a bridged pair of amplifier channels resulting in design load on the amp.Comment
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