Parts-Express recently agreed to let us start sharing our projects while they are still in development instead of waiting until they are finished, so this is the start of my next build.
"Yeah. All right, you primitive screwheads, listen up. See this? This...is my BOOMSTICK! It's a 4" quad woofer tower, S-Mart's top-of-the-line. You can find this in the electronics department. That's right, this sweet baby was made in Ann Arbor, Michigan. Retails for about $299.95. It's got a MDF stock, brushed aluminum and a hair trigger. That's right. Shop Smart. Shop S-Mart. YA GOT THAT!?"
It is a slim-line, high-WAF tower using four Dayton RS100-8 woofers and one Dayton ND25 tweeter per side. The f3 should be in the upper 40s with f10 around 40 Hz and can take about 30-40 watts above tuning without exceeding x-max and good cone control below x-max for a ported design. Overall, it will have about the same cone area as a 6.5" woofer, but the cabinet is only 5.5" wide.