Usually when I do a review on a product I will run it in one of the work vehicles for a week or two testing out different settings and getting a general feeling of how it functions, sometimes I even push the items to its limits. Writing a product review on the Digital Designs M4a is slightly different in this case since I have been running two in ABTEC3 for about a year now and have used them for everything from SPL, Ground-Pounding to just playing Ordinary Everyday Music. The build quality of the M4a is just flawless, not just...