Rms...coil layers and size.....Motor Force....cooling
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thanks fo the help i think i got it
brand is not everything look at this 750watts 3 inch voice coil for $62
NEW STEREO 12" DUAL VOICE 4 Ohm 12" 1400W CAR AUDIO SUB SUBWOOFER 1400 WATT M2 | eBay
I look at RMS, and Peak,DB level,HTZ,Coil size, Cooling,and the recommended CU.Ft>needed.,as well as Reliability/reviews of woofers/performance.I try to buy USA made subs mainly...Keeping it Home,my next line will be a choice of FI, or PSI
i like those fis