So i have a 2016 street glide special that i just ordered a set of Mmats PA601CX in 4ohms. I'm trying to piece together a simple setup as i just want to do the fairing speakers. I was looking at the sound digital 800.4 Evox amp and a dsr1 dsp. Is that a ok setup? I'm trying to do all the research before i purchase everything. The reason I'm looking at the 800.4 is later down the line I'm thinking of adding rear lid speakers. Is that a good choice of amp for eventually adding rears later on?

 

the SD amp is goold the Mmats MD4110 is also a good choice. since you are using coaxil speakers, the DSP is not a necessity, but it will give you more control and make it sound better. choose a different unit, though, the DSR1 is less than it appears. the ARC PSM may suite your needs.
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If I decide to not get a DSP, do I still have to flash the stock radio?

 

yes flash will flatten the built in eq from the head unit.