A:Answer This such a vague question because there are so many options. It depends on what you’re willing to spend and how good do you want it to sound. There’s low price, low quality. Medium for medium and so on. Rear component speakers medium quality will run you around 500 with installation. Of course you can go cheaper components cheap sound. If you’re talking about subwoofers it’s the same deal cheap speakers and low power amplifier will give you cheaper sound. I installed medium range speakers 2 pioneer 12’s with a good amplifier. The cost for box, speakers, amplifier, wiring kit and installation came out around $1,000 but you can spend alot more. The morale of the story is you will get what you pay for. Do alot of research before making your decision.