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Originally Posted by vollev
I will be looking to install an the ever popular Avic D3. I was hoping to keep the subwoofer and tweeters functioning, so I was going to use this method instead of the bypass.
Now, I have researched the options, and assumed everything would be all fine using this approach. However, now its getting a little hairy when you talk about line level outputs, sound quality, etc. I apologize is this sounds silly, but what exactly are you talking about? I haven't received my D3 yet, nor do I have extensive car audio knowledge. Is there anything I should be cautious about when using this method to ensure the sound quality remains excellent?
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An after market HU will have two types of outputs, line level and speaker level. The RCA jacks on the back carry the line level signal and the speaker wire outputs carry the speaker level outputs. Generally a HU will be cleaner on the line level outputs, but this isn't always the case. In some cars, like newer VWs with the Monsoon system, the extra Voltage from the powered outputs of a new HU is what the system really needs.