Can I run 2.7ohm speakers off a Fusion(4 ohm 4X50w) HU?
GrumpySmurf
Posts: 1
Hi, I am starting a new install on my new boat. I have no desire at all of using an amp (due mainly to cost as well as battery usage during hours of sitting around fishing).
I have already ordered 2 pairs of Polk's MM651 (2.7ohm). I think I may have made a mistake there and should have gotten the MM651um (which are 4 ohm). I wish to run these speakers off a Fusion MS-RA205 http://www.fusionele...series/ms-ra205 which is rated at 50W x 4 (at 4 ohm).
I am now very worried I may blow something (I will turn the volume right up during skiing). And that I have to try and return the MM615 for the MM615um.
The retailer (other side of the country from me) assured me that it will be OK, but I am still worried! So should I go through the expense and hassle of swapping these for the 4 ohm speakers, or am I worrying about nothing? On another note, the speaker's box does say it is compatible with 4 ohm outputs.
I have already ordered 2 pairs of Polk's MM651 (2.7ohm). I think I may have made a mistake there and should have gotten the MM651um (which are 4 ohm). I wish to run these speakers off a Fusion MS-RA205 http://www.fusionele...series/ms-ra205 which is rated at 50W x 4 (at 4 ohm).
I am now very worried I may blow something (I will turn the volume right up during skiing). And that I have to try and return the MM615 for the MM615um.
The retailer (other side of the country from me) assured me that it will be OK, but I am still worried! So should I go through the expense and hassle of swapping these for the 4 ohm speakers, or am I worrying about nothing? On another note, the speaker's box does say it is compatible with 4 ohm outputs.
Post edited by GrumpySmurf on
Comments
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I too,would like to know about this!!! Very important!!
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Yes, you can and itll be fine. Those are "nominal" impedance ratings. Theyll fluctuate around and wont be that all the time. But yes, itll work just fine. Dont sweat it.polkaudio sound quality competitor since 2005
MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st
polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D -
The link you provided does not work so here is a link to the radio. And on page 4 of the owners manual it says "Note: Minimum load Impedance 4 ohms" page 6 of the owners manual! So no you cannot drive 2.7 Ohm speaker off it, but if you do try it might cause a issue with the deck itself!
http://www.fusionelectronics.com/marine/products/head-units-200-series/ms-ra205
http://www.fusionelectronics.com/content/product_downloads/MS-RA205_Manual_Singles_30-11-12.pdfAlpine CDA-7863 HU
Alpine MRP-M240 50x4 F&R amp
Alpine MRV-M450 Sub Amp (2ohms)
Polk Audio DXi124 DVC (2ohms)
Alpine SPS-510 x4 F&R Speakers
Alpine CHA-S604 6 disk CD-Changer
