A:Answer Be advised. If these online tech advisors tells you it'll cost $19.95 and 15 minutes, it is good for mounting a subwoofer speaker only, nothing else. You may have to purchase an amp and it may cost you at least $129.95 or more and at least two to three hours to install them. Better to visit their mobile installation directly and ask for their advice. Stay away from going online for pricing and advice.