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<blockquote data-quote="robertsean350" data-source="post: 8834822" data-attributes="member: 688491">Want to reach out and say hello to everyone, new to forum.Working on my first custom build.&nbsp; I have modded factory installs and built boxes, but not completely designed and built an audio system from the ground up. The current project must still sound great, but only on the inside. I started with sound suppression and am now moving into speakers etc. &nbsp;&nbsp; I have always enjoyed quality music. Getting my jeep to sound good on the highway was my biggest challenge until now.&nbsp; Interior db was measured @90+/- going 75mph.&nbsp; No music, just the roar of the vehicle as equipped.&nbsp;&nbsp; Trying to remember the box design name. The port&#039;s area= to the speakers area and length was 1/4 the length of the targeted frequency wavelength.&nbsp; Very big box for a single speaker, but it did get the job done.&nbsp; I keep thinking it was called a transmission line, but google searches are not showing me the design I used.&nbsp; I wanted to try and replicate using 4 or 5 inch woofers and PVC.</blockquote>

[QUOTE="robertsean350, post: 8834822, member: 688491"] Want to reach out and say hello to everyone, new to forum. Working on my first custom build. I have modded factory installs and built boxes, but not completely designed and built an audio system from the ground up. The current project must still sound great, but only on the inside. I started with sound suppression and am now moving into speakers etc. I have always enjoyed quality music. Getting my jeep to sound good on the highway was my biggest challenge until now. Interior db was measured @90+/- going 75mph. No music, just the roar of the vehicle as equipped. Trying to remember the box design name. The port's area= to the speakers area and length was 1/4 the length of the targeted frequency wavelength. Very big box for a single speaker, but it did get the job done. I keep thinking it was called a transmission line, but google searches are not showing me the design I used. I wanted to try and replicate using 4 or 5 inch woofers and PVC. [/QUOTE]

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