I don't know which radio you have but, in my '15 cougar, the radio's channels A & B are 20 watt channels. Channel C, which is what the outside speakers are hooked to, is only 10 watts. What this means is the external speakers are not being driven nearly as hard as the inside speakers which means they will be much quieter for the same volume level. This issue annoyed me as well. My fix is to pull the radio and switch the outside speakers to channel B, and one set of inside speakers to channel C.
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2015 Cougar X-Lite 31SQB
2015 Chevy 2500HD Z71 Duramax
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