Upgraded the factory radio with the xav-ax5000, multimedia reciever, with android auto and apple CarPlay, by Sony. Upgraded the front speakers with 6.5" drivers, ecx165.5, by Hertz. Added a hefty amplifier under the ferring, t400x4ad, by Rockford fosgate. Left power and wiring to add 6x9s in the saddle bags at a later date. Even with just 2 speakers in the front of this bike, the sound is substantial and impressive.