Harley Stage 1 & 2 Speakers with Boom Audio Amplifier Guide The stock Boom Box audio system already sounds pretty good compared to previous years, but the Boom Audio Stage 1 & 2 speakers and amplifier ad ons make it even better. But, not without a hefty price tag & confusion by dealerships. Just to get started with the batwing fairing Boom!™ Audio speakers and amp you will be over $1,000. Add more if Boom! Audio System Wiring Harness - 70169-06A | Harley Hi Garey, According to fitment, this would be the right harness for an '11 FLHX if you were to add the Boom!™ Audio iPod Interface P/N 76476-10. If you find yourself having trouble with installation, I definitely recommend having your local dealer take a look.
Related with wiring diagram for a boom audio 76000635