Im sure this has been asked before but her it goes. Does a bike with an aftermarket stereo need a DSP for the best sound ? I have the Sony XAV-AX100 on my 18 RGS and a Focal FDP Sport amp, speakers are still up in the air i may go pro audio but right now i have DB Drive Moto 6.5 and 6x9's, im thinking about getting the Dayton DSP 408 while im doing upgrades.
Depends on ur speakers & the capability of the HU. In ur case, when u define the exact speakers then it will be a bit more clear on how much u need to manage them.