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Hi there. Thanks for your question! The price does go up a little from $119 to $129 when changing from a 2 channel amp to a 4 channel amp. You can view more about this service by visiting: https://www.bestbuy.com/site/4-channel-amplifier-installation-hardware-not-included/3582096.p?skuId=3582096. I hope this helps! Please let us know if you have any further questions.
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