Check the listing for details. 15" WOOFER 15" SPEAKER JBL COMPONENTS IN A PMR FRAME LINE ARRAY SUBWOOFER / WOOF. Condition: New. Listed at 249.99 USD. *******************SEE MY OTHER LISTINGS!!!**************************For demanding bass and mid bass applications, we are fabricating a limited series of 8 of these 15" extra heavy duty subwoofers/woofers.Being assembled with JBL components inside of the heaviest PMR frames we offer, these provide that JBL tonality and performance at a fraction of the cost.Providing powerful lower octave output, and ear shredding bass/ mid-bass, these are a great solution to high output PA systems, monitors, as well as bass guitar applications.Here's some info:Frame- heavy cast aluminumMagnetic composition- samarium cobaltHook up- Spring loaded bare wire terminalsSpider- treated cloth/ high compliance/excursion textileLitz wires- .060 " woven conductorsDust cap- repressed smooth pulpFront mounting gaskets- yes/ poly foam rubber 4/8 hole patternSurround- heavy duty textile/ triple "M-Roll" profileCone profile- deep curve-linear/ partially ribbedCone composition- poly pulp hybrid ( water/ weather/ UV resistant)Voice coil former- aluminum/ radially ventedVoice coil diameter- FOUR inches! (4")Windings- SOLID copper wire (not CCAW)Impedance- 8 OhmsSPL- 96dBPower- 800 RMSResponse- 25Hz-1KhzFs- 26hzQts- 0.44Vas-210 LITERSDCR- 6.3Core- longitudinally ventedExtra venting- radially vented under neath of the spider directly to the atmosphereWeight- 21 pounds 2 ouncesDepth-7.25"That'll give you guys a good idea of what's these are actually made of, and how they will perform.These have great "power compression " numbers, due to the ability of the overall design to keep the voice coil running cool. The core is vented in a traditional manner, but if you look at the pictures, you can see how the coil and former themselves are exposed directly to the air for unbeatable heat exchange through the radial vents that are between the magnet and the spider itself.Plus, with the JBL parts, you get really high performance and using an OEM AMERICAN made JBL cone, you get that JBL tonality and appearance.I'm confident enough that you'l love these, that I am including my 15 day NO GAMBLE return option from delivery date (((less customer damage))) if for ANY REASON you simply don't like it.So, if you need a REALLY beefy 15" driver(or 8), then here ya' go!ANY questions or concerns, just ask.Thanks guys