Tweeters in the A pillar is a good plan. If you can get tweeters that handle a lower crossover point that will help bring the sound stage up higher.

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My Car Domain page
2006 Nissan Frontier Nismo 4x4
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2008 Results:

Oct 19, 2008 - 2nd Place - SQi Rookie, Team Shadow (IASCA Canadian Western Finals)

Sep 21, 2008 - 2nd Place - SQi Rookie, 604 Autosound (IASCA Event)

Aug 10, 2008 - 3rd Place - SQ Rookie, Andre's Audiotronic Kamloops

July 20, 2008 - 1st Place - SQ Rookie/3rd Place - Best SQ, Andre's Audiotronic Penticton

Jun 15, 2008 - 2nd Place - SQi Rookie, Sounds Good Auto (IASCA Event)

May 18, 2008 - 1st Place - SQ Open Class, Absolute Car Audio