I'm planning a small-ish electronically-assisted sealed sub for my small HT setup. Priorities are: * High-quality response down to 20Hz * Compact size (10" or 12" driver max) * Low cost * Very high WAF I am not interested in high SPLs, and will be driving it from a BK Electronics 100W MOSFET amp I have lying around. I'll build a suitable circuit around the ESP Linkwitz Transform circuit once I've selected a suitable driver for the box. For an example, using a JBL GT3 12" would give me up to 92dB at 30Hz and 80dB at 20Hz, limited by amplifier power. This is more of a design and construction question than a speaker design question. See the rendering below - the top is 1.5" pine, and the legs are 3" diameter pine with a 90 degree "cutout" to hold the black-finished MDF box. The MDF box has the down-firing speaker 3" off the ground in a 45L enclosure, with a small upper cavity for the electronics. The pine top has a glass inlay, and the blue thing is a 12" ruler for scale. The MDF isn't translucent - that's the reflection of the skirting board in my perfect piano-gloss finish. Any comments on construction? I plan on getting a local pine shop to do the pine bits, but I'm concerned about the feasibility of the accurate 90deg cutout in the legs.