I have an amp question..

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Steven72555
Steven72555 Posts: 35
edited September 2013 in Car Audio & Electronics
I drive a Dodge caravan.
I am thinking of installing an amp for more volume from the back only. I won't be putting in subs, just better full range speakers. My current stereo has a "reported" 50watts per channel, I want more! I really don't want to spend a load of money for this project.
I keep looking at BestBuy inventory and I just don't know what I am looking for, I guess.

Any suggestions what I need to look for here?