Straight from DC's website....
"Level 4 XL
This sub was developed out of demand.
We were getting a lot of requests for something bigger than the LV4 but doesn't kill the gas mileage like the LV5 80+ lbs subs. We were moving a lot of hybrid subs that used LV4 motors with LV5 coils but we knew we could do better than that.
So we thought, everyone likes the LV5, It’s a fantastic sub... Lets use it as the platform for an in-between sub. We played around with a smaller version of the LV5 - That’s exactly what the XL is... It uses all of the same soft parts of the LV5 with a smaller version of the same motor. Just small enough to squeeze through the cut-out hole for a 10" driver. What was the end result? A great sounding high powered daily driver sub that can be used in or out of the competitive lanes. The XL has devastating lows and reliability. It quickly became our best selling sub!
Key Features
• Extremely rigid non-pressed paper cone assembly
• Multilayered polymer foam surround
• Polypropylene dust cover with embossed DC logo
• 8”OD semi cup progressive roll spiders
• Extra heavy duty interweaved tinsel lead wire
• Cast aluminum black frame
• FEA analyzed and optimized motor assembly – Fully CNC machined
• Rubber mounting gasket
• Chrome spring loaded push terminals
• Dual 1ohm , 1.4 or 2 ohm 3” 8 Layer Hi-temp Aluminum voice coil wound on black anodized voice coil former"