Not a woofer, he wants an external amp to drive better sound to his speakers ie. IMDNLe, which has a crappy on board amp.
I know people recommend Pyle
https://www.amazon.com/Power-Home-HiFi-Stereo-Amplifier/dp/B0071HZ5LE/ref=sr_1_28
I need to get this going as well. My IMDN should sound much better. You figure with the price tag, Stern could have given us a better amp {sheesh}