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<blockquote data-quote="jerlands" data-source="post: 8781127" data-attributes="member: 685012">[URL unfurl=&quot;true&quot;]https://www.clublexus.com/forums/lexus-audio-video-security-and-electronics/943659-lessons-learned-es300-audio-upgrade-amplifier-integration-and-bypass.html#post10795426[/URL]Phase 1 - Aftermarket Head Unit connected to Factory Amplifer, Speakers and Subwoofer. Whether you did it yourself or inhereited it from the previous owner, I hope your aftermarket head unit was well chosen and correctly installed using the parts outlined above. This configuration can sound OK, but unless you&#039;re very lucky or using a bunch of filters to hide the problem, you will hear some ground noise (a background hiss or buzz - faint at times and louder at others) along with a higher-pitched whining interference from the alternator that increases with engine RPM. Also, most will hear a solid &quot;Pop!&quot; through the speakers whenever the factory amp turns on or off. I put up with this for a while before deciding to bypass the factory amp: &quot;Phase 2&quot;. Getting from a noisy factory amp &quot;integration” Phase 1 to Phase 2 with the bypassed factory amp is mostly what this post is all about, so details and pictures follow below. To get to Phase 2 from Phase 1, you&#039;ll need the following:</blockquote>

[QUOTE="jerlands, post: 8781127, member: 685012"] [URL unfurl="true"]https://www.clublexus.com/forums/lexus-audio-video-security-and-electronics/943659-lessons-learned-es300-audio-upgrade-amplifier-integration-and-bypass.html#post10795426[/URL] Phase 1 - Aftermarket Head Unit connected to Factory Amplifer, Speakers and Subwoofer. Whether you did it yourself or inhereited it from the previous owner, I hope your aftermarket head unit was well chosen and correctly installed using the parts outlined above. This configuration can sound OK, but unless you're very lucky or using a bunch of filters to hide the problem, you will hear some ground noise (a background hiss or buzz - faint at times and louder at others) along with a higher-pitched whining interference from the alternator that increases with engine RPM. Also, most will hear a solid "Pop!" through the speakers whenever the factory amp turns on or off. I put up with this for a while before deciding to bypass the factory amp: "Phase 2". Getting from a noisy factory amp "integration” Phase 1 to Phase 2 with the bypassed factory amp is mostly what this post is all about, so details and pictures follow below. To get to Phase 2 from Phase 1, you'll need the following: [/QUOTE]

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