N4R 4" Reference Series Speaker - 4 OHM - (Pair) White This is a state-of-the-art 4" speaker.  It has a 1.5" Voice coil and a Neo magnet structure.  The magnet has a copper Faraday ring for less induction.  It is a great mini monitor with bass below 60Hz and clean to 20kHz (+/- 3dB).  It has a 90dB efficiency and a really smooth impedance curve.  It is also impervious to the elements so can be used outdoors, PWC, ATV, etc. This speaker would be right at home as a mini monitor for your computer, home theater or a wide-band driver in a two or three-way system.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.