Ok, so I'm another Prius owner who is short of happy with the JBL audio system. JBL makes some very good components but for some reason they were lacking in the Prius. I felt my Prius needed more bass so I did some researching and had a BAZOOKA 8" base tube installed to help beef up the under cut system Anyway.... I found a thread on Prius chat regarding a bass tube being installed by Circuit City. (http://www.laaudiofile.com/bta6100.html) The person seemed extremely happy with the turnout so I figured I wanted to do something similar. Instead of installing the BTA6100 which is a 6 1/2" 100W bass tube I choose the 8" 200W bass tube and had a circuit city do the installation. I was extremely disappointed in the level of service I received at Circuit City. I made a great effort to tell the person about the car - how to turn it on, drive it, told him about the 12V battery that is located in the rear, and referred him to the amp under the passenger side seat, etc. All this time while telling the manager this, he continued to blow me off. I dropped it off at 1:30 and was scheduled to pick it up at 4:30 that day. I showed up at 4:30 to find out they weren't even half way done. I noticed the manager had the main power wire ran from the back of the car through the firewall and into the engine compartment. I questioned what he was doing and he said hooking up the battery. I was pissed to say the least. After I told him AGAIN about the 12V battery in the back he replied, "Oh thanks, you just saved me 15 minutes." He also didn't know there was a JBL amp under the seat. He didn't listen to a word I said, and now the car isn't even half way done even though it was 4:45. I was upset so I spoke with the Store Manager and he refunded my money back to me for the service installation. Other than the fact that now I have to go back in because they did not snap my dash back together properly I'm pretty happy. The sub definitely helped out. There is a sensation of good, clean, deep sounding bass. It's not overpowering like a typical 12" sub in a box which is good. Next step may be to replace the tweeters. The sub also didn't take up too much cargo space and can be easily removed if need be. All and all I am happy with the sound that this sub produces, as you can tell I just wasn't very happy with the carelessness of Circuit City. A question for you out there, is it ok that circuit city hooked the bass tube up to the amp instead of the rear speakers for a signal? Probably in their minds that was easier than taking the paneling off the doors to tap into the rear speakers.