If anyone is on the fence about adding these amps to your pins, don't be. These are fantastic! I have recently added these to 9 of my games and the difference is mind blowing. If you've ever listened to a game through headphones, you'll notice sounds that you've never heard before. These do the same thing for the speakers. The clarity and volume are at another level.
I have installed them with Pinwoofer speakers, Flipper Fidelity speakers and the PinSound kit. They all sound fantastic!
Dan's customer service is top notch and he will make sure you get up and running as easily as possible. Highly recommended.