I know there is a mini-jack to add a standalone speaker for the GPS guidance. However I have the same issue with phone calls that I have with the guidance, it can be hard to hear from speakers so low on my front doors, especially when I have a passenger who's legs, bag, etc. are blocking the speaker. Is there any possible way to install standalone speaker for phone calls, like the GPS guidance has? Currently I am using the RCA outs to an amp. Is there some way to use the front wire leads? Some third party device that can wire in and allow a standalone speaker?

 

Thanks!