I posted a message before about converting an 8" sub to a sonosub. I have an Energy e:XL-S8. Thing have changes and so have my ideas. I'm thinking of the 142.5L vented box plan on the Adire site for a Shiva. The specs on the Shiva say it can be driven with most home receivers with 100W per channel. My current sub has a plate amp with 100W RMS, peak of 400W. Would my current sub amp have enough to power the Shiva to a reasonable listening quality? Would it at least get me by until I can purchase something larger? Would a different size enclosure help me out? I use my system for mostly movies. I want a little more oomfph in the base area.