At American Hard Bag we offer only the highest quality audio for your Harley-Davidson bagger. DSP or Digital Sound Processors allow you to fine-tune and get the most out of your Harley audio system. With offerings from Rockford Fosgate like the popular DSR1 and the powerful new Helix M FOUR DSP, we've got you covered. Need help deciding or have questions? Speak now to one of our sales consultants or support team.