Sorry, but I failed to mention the monsoon systems. Some aleros have a premium system that utilitzes a external amp (in the trunk behind the left side wall) and bi-amped speakers. In the event you have a monsoon system, you will require special speakers to get the full bandwidth or going to another external amp.
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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