New to diy, so please bear with me. Before I start to build a sub, I have a couple of questions. My current setup consists of an 8 inch KLH sub with a 120 watt amplifier that goes from "30-40 to 120" hrz. This sub is hooked up to my receiver which is a Yamaha RX-V 630 (about 2 yrs old). If I understand it correctly, I think that it is rated at about 75 watts per speaker (not sure how accurate that is, though). I do not plan on upgrading my receiver anytime soon. I have been thinking about using either a Shiva or Tempest driver and combining it with a 250 watt amp either from Adire or Parts Express. If I use one of these combinations, can I hook it up to my Yamaha (I have nothing else to hook it up to) similarly to how it is now hooked up to the KLH? Will this supply me with the correct/adequate power, etc to play the sub? If I am totally off base or way out in right field, please let me know. Depending on your answers, other questions are forthcoming. thx, Frank p.s. I have been reading all of the diy posts on this and other forums for the past 3 weeks or so, but at my age, I forget about 90% of what I read.