This is my first real venture into any sort of DIY (if you can even call it that) except for fiddling around with broken speakers. I just bought a Sony SAWM-40 from sears for $150 w/price adjustment to Best Buy's price. I didn't want to spend too much on a sub to be used in a college environment...performance is good for a budget sub, and I would like to keep the overall investment low... ...but I am always looking for an improvement. That said, I was thinking I would swap the driver with an Adire Audio Shiva MKII for $120. After corresponding with Adire, I decided against it (for price reasons it would negate the whole point of buying a budget sub, sony box tuned too high, boost in sony amp at undesirable freq.). I want to keep the price low, and I came across (for $30 each) A 12in. Sony X-plod Driver (with the red motif), and a 12in. Pioneer (which is made to look like metal with little bumps on it, black surround), which supposedly is made to play very deep. Would it be a good idea to do a driver swap with either the sony or the pioneer? Would the fact that they are car subs (4 ohm) ruin the stock Sony amp? I am thinking I would get more power out of the amp because of the ohm ratings but I am afraid I will ruin it. I need enclosure experts! Does anyone think the sony box is tuned too high for either of these drivers? I can put in one of these at a nominal cost, and I would appreciate any feedback I can get. I don't think I am ready for true DIY, so I'd like to start here. Thanks! -Kaaran. P.S. They are Demos so I am trying to find out the model #s, sorry for the lack of information, I am working on it.