Let me start by saying it is not the actual driver from Adire, but MY alighnment/enclosure. Previous set-up: 2- 8" 100watt subwoofers that are built into my Infinity RS-8 main speakers. output range:32Hz-110Hz. I want more quality bass and more quantity of bass. Current Set-Up Tell me where I went wrong!) I am NOT acheiving the SPL that I had expected. Also at loud volumes when a loud explosion happens on my dvd, the driver POPS really loud. (I turn down immedialtly to not dammage the driver). The driver distorts too easily at high volumes with music or movies. Shiva in a 4.8 ft^3 effective size (total size minus driver, port, bracing etc..)enclosure made from 3/4" MDF. Port is a Lightning Audio 3" flare port, which tunes enclosure to 23Hz. Parts Express 250Watt plate amp (same a Adire, but still has 30Hz "boost"). The Shiva is wired with both (+)'s on the voice coils connected to the (+) on the amp, and both (-)'s connected to the (-) of the amp. Thus giving a 4 Ohm load to the amp (I think)? I have a H/K AVR 500 receiver. I have all my speakers set to small (100hz-20Khz) and set in the middle of the range (0db) The subwoofer is set on (20Hz-100Hz) and also set at 0db. The bass is set at the middle detent. On the PE plate amp, the level is straight up and down.(halfway between min and max). The cross over is set in the middle (halfway between 40hz and 160Hz) 100Hz. Polarity is adjusted a best as I can determine with my head stuck back there where I can reach it. Here are the enclosure particulars: The Internal dimensions are 22.875" X 23.4375" X 18.25" =9784.424 in^3 - 183 in^3 (driver displacement) - 50.53 in^3 (port volume) - 632.85 in^3 (internal bracing) - 620.5 in^3 (bricks) *see below* -------------------------------- 8297.55 ft^3 =4.8 ft^3 *I had to adjust my volume due to the fact that the internal piece to my port would be less that an inch, which would not work. So I had to fill some space in the enclosure to get the port length and the enclosure volume right. Thus the bricks I added for volume and weight. This thing weighs a TON. Is there something else I can us to take up space w/o the weight? The length of the port is calculated according to the following equation. Lv= 8466.4 X (Vr)^2 ------------------------ - 1.463 X Vr Vb X (Fb)^2 where: Lv= Vent Length 8466.4 = contstant Vr = vent radius = 1.34" Vb= Enclosure volume (ft^3) = 4.8 in^3 Fb= Tuning Freq = 23Hz 1.463 = contstant =4.02" Lv cut center piece of port 3" less to achieve proper length. = 1.02" WHAT IS WRONG? Is the driver wire incorrectly? Is my alighnment off? Is the enlosure volume/tuning incorrect? Will someone please help me!!!!?? I have spent over $350 and a lot of time to get a sub that is SUB standard.