N7R 7" Reference Series Speaker - 4 OHM - (Pair) White The 7" would be equally at home in a high definition home audio / theater or on your boat.  As all the Reference Line are a cut above, this will play down to 35 Hz and cleanly to 20 kHz.  The sensitivity is 92 dB so you can play very loudly with little power. Having a 1.5" voice coil, it will handle 80W continuous and 300W peaks.  It has a cast aluminum frame with a special two part coating to guarantee years of trouble free use in all applications. 4 OHM speakers are recommended for installing speakers in the same zone/channel. Features:100% WaterproofUV and Salt Water ResistantFull Range (No Crossovers)Spiderless (Less Resistance)Light (Neodymium Magnets)∗3 Year WarrantyWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.