I have the alpine 9850ri head uni. With S type alpine speakers in the front and E Type alpine speakers in the back. I have an active sub woofer in the boot of the car. My sub woofer is great, no complaints. My stereo sounds is good as well. But I want more. So recomend me an amp. I like alpine stuff but any brand you know of please Also how easy is it to install an amp into my car myself. I got the original setup done professionally. The shop said they will fit an amp bought from them for free, but it will be cheaper to buy it online and fit it myself. About $200 would be the budget I think. Or if you are in the UK about £200. Thanks!