I have been trying to figure out how to add a Pro Audio setup to my lowers using the Bt 4180. I also have a hard time sending frequencies to a speaker it was not made to produce! I see that DD has a crossover CC2 under archives that is used for the VO6 and B3 horn that has 5 levels of tweeter attenuation fom 0 to -12 db... anybody seen or tried this set up! I was wondering why you couldn't buy a PA component type set up (horn, x-over and woofer) then you wouldn't have to run a DSM (signal processor) now I have found one. On another note I see American Hard Bags has the Hertz Sv 165.1 ST25 horn and the grill, to mount in the fairing of a 13 and older SG for $599 which speakers alone are worth about $480 not a bad deal!