I have been dragging my feet on building a custom fiberglass box for my 12" Alpine Type R shallow sub for a few years now. I tried the Soundstream 13BX and it sounded terrible since it wasn't vented. This cab has a horrible midbass hump and no cabin gain. I had it powered by a Zapco Studio 500. I have been looking at "cough, cough" kicker's truck box offerings with the passive radiator. I don't have the time to dedicate to this so maybe for the short term a prefab box would suffice in the meantime. I have always been interested in Alpine's PLT-5 system as well. Finding one locally would prove difficult though. I just want some bass to round out the tunes for now. The Soundstream is pretty much the size depth wise that I can fit so extreme shallow only. Ideas welcome.