The fourth version of our acclaimed E series has been refreshed for 2020. Since we introduced the first E series in 2012 we have sought to push the limits of entry-level woofers forward. Typical entry level woofers are highly limited in terms of linear excursion, mechanical ruggedness, and thermal performance – all of these bars have been raised once again for our fourth generation E series. The v.4 update is a minor refresh from the v.3 featuring a new custom-tooled, stronger stamped steel frame and a upgrade to our directional forced-air cooling spacer. A double stacked magnet structure and an extremely long voice coil allow us to achieve a class-leading linear x-max of 14mm one-way in addition to high mechanical clearances (over 2” peak-to-peak before physical coil bottom). The E v.4 series has been upgraded to a full 2.5” diameter coil (this started with the v.3) compared to the 2” coil of previous generations (v.1 and v.2). The tinsel leads have been upgraded to a new “Mini-XL” lead containing 63-strands of conductor (a full XL is 84-strands and previous leads contained 42-strands) to help prevent potential failure due to amplifier clipping. The spider itself is a high-strength poly-cotton blend designed to handle the full capacity of the motor. To provide an additional level of ruggedness the spider is bolted down and glued to the frame.Bottom-line; if you are looking for a great subwoofer option and do not want to break the bank the Sundown E-Series woofers are for you & these are the best E series made to date. They are ideal for anyone from beginners to seasoned professionals seeking industry leading performance at a value price point.Physical Dimensions FEATURES: Xmax = 14mm one-way by 70% BL RMS Power = 500-watts (300-watts 8”) Vented magnetic gap Vented pole piece with optimized geometry (solid pole for 8”) Black Aluminum 2.5” voice coil former for superior heat dissipation (2” coil for 8”) High Temperature 4-Layer copper voice coil wire Spring Loaded Terminals Stitched-On “Mini-XL” Tinsel Leads to prevent fatigue and failure Bolted-on Spider Pack Bolt-through motor design to ensure maximum longevity and ruggedness against mechanical failures High strength stamped steel frame Optimized for ported enclosures SPECIFICATIONS:  T/S Specs E v.4 12" D2 E v.4 12" D4 RE (Ohms) 4.030 6.130 FS (Hz) 28.480 28.373 VAS (L) 53.059 54.292 Qes 0.509 0.570 Qms 5.249 3.542 Qts 0.464 0.491 BL (NA) 17.576 20.249 Mms (Grams) 217.987 213.033 Cms (mm/N) 143.258 146.589 Sens (dB @ 1w/1m) 85.7 85.3   ENCLOSURE SPECS: Ported Enclosure Size: 1.75 cuft net Port Area: 26 sqin Port Tuning: 35hz Sealed Enclosure Not Recommended Displacement: 0.12 cuft.  Depth:  6.50" Outside Diameter: 12.250" Cutout: 11.125"