Just wanted to thank Dan for a great product and customer service. I installed a Pinball Pro system designed to work with the 12" sub that Stern included on my original AC/DC Luci, but was never happy with the sound. Was planning to convert back to the original speakers when PinWoofer came along. Dan was wiling to supply a Super Kit to work with the existing huge Stern sub. It took me about an hour to install the new system. I wasn't sure about a couple things so sent Dan an email. He got back to me within minutes to give him a call, and was able to answer my questions right away. I'm still fine tuning the sound but it's vastly improved over the non-amplified Pinball Pro system. I probably could have left the Pinball Pro back-box speakers and L-Pad in place and just added PinWoofer amplifiers, but wanted to start from a clean slate. I'm not that picky about sound but a quality speaker system makes a huge difference on a machine like AC/DC. I have an Avengers Hulk with stock SAM speakers and Polk sub right next to AC/DC, and you can clearly here the improvement with PinWoofer. I installed PinSound on my TZ several months ago and will probably add a PinWoofer system now to get the full benefit.