I rarely find drivers that meet my standards of performance. However, I have discovered a jewel in the rough. A driver that is suited to sealed alignments, and provides substantial output level down low, and with zero compromise of sound quality. Reasonable cost with extraordinarily linearity; linearity matching, or slightly superior to JL W7, which is a benchmark in high end performance subwoofers.
Purchase the following things:
-Eclipse SW8200 12" Subwoofer $200-$230 (
$220 w/shipping BIN on eBay)
-Dayton Pre-Fab/Pre-Finished 3.0 ft^3 sealed cabinet. Black. $190(
Parts Express Link)
-O Audio 500 Watt Bash Plate Amplifier $230(
O Audio Link)
Total cost: $650 Approximately.
A commercial product of somewhat equivalent quality and performance will cost you at minimum 3x-4x this amount.
All parts here are critical for proper function of the system. The amp is interchangeable only if you find one with equal or greater ACTUAL power AND it must have a true parametric E.Q.. You shall set the parametric E.Q. to 36-38Hz, it shall be set at a Q of 1, and it shall be set to gain of -2dB. The parametric setting is crucial because the 3 cubic foot sealed box creates a natural Qtc of 1.1. This is too high for good sound quality; it results in resonant/peaky response. The parametric filter counter-acts this effect and gives you a perfectly smooth, high sound quality response curve.
Notes: The driver has a motor with 3rd party verified
linearity of outstanding characteristics. Even at 60 mm peak-to-peak, motor BL strength is nearly identical (within about 10 percent) to 1 mm excursion point. This driver shall never enter any excursion in the use above that puts it into a non linear position. It shall have near identical sound quality at 10 watts or 400 watts input power. SPL will be a minimum of 2x of the commercial subwoofers you have considered so far. Sound quality will be radically superior, also. -3dB point will be 26Hz, -6dB will be 21 Hz. Since this is a sealed system, rate of roll off is shallower than ported units. With room gain/LF boost of typical closed 2000 cubic foot room, -3dB in room will be expected to be about 20Hz. You should install high density fiberglass or rockwool/mineral rock/wool fiber - the stiff stiff that comes in 2' x 4' boards - in the cabinet walls for ideal dampening. Use 4" thick on bottom and back panel, and 2" on remaining interior. The material comes most often in 2" thick pieces, so simply double it for 4". Install cloth or thin carpet foam over the fiber material to prevent fibers from possible entering the driver motor vent and causing motor problems.
ALL YOU HAVE TO DO TO BUILD THIS IS CUT A COUPLE OF HOLES. NO SPECIAL SKILLS REQUIRED.
-Chris