I belong to the PT Cruiser Club:
http://www.ptcruiserclub.org/
There is great information there on upgrading your speakers. You will however have to join. I think it is well worth the money. Here is a tidpit from the speaker upgrade guide. You will have to join to get the rest. You won't be sorry if you join. Believe me, it is a geat site that has a good forum too.
PT Cruiser Club Customizing Tip
"How to install upgraded speakers in a PT Cruiser."
Where do I start?
Decide which speakers you want to replace: The PT Cruiser has front dash speakers, front door speakers, and rear pillar speakers. You can replace all six speakers at once, or just replace any pair by itself. Some my also desire the added bass of the Mopar Subwoofer that installs in the left rear quarter panel. You will get the biggest improvement from installing upgraded dash speakers and from installing a Mopar Subwoofer.
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2003 Electric Blue GT. Mods - BTG lowering springs, Polished Blane hood struts and hatch strut covers, chrome door handle scratch guards, molded rear splash guards, BTG polished strut tower brace, BTG axle back exhaust, K&N drop in air filter with baffles removed, Royal Purple synthetic motor oil and K&N filter, Polished front and rear sill plates, Chrome \"PT CRUISER\" rear license plate frame, chrome door spear covers, Chrome antenna bezel, Get the BEST detail products from Gary here: http://www.perfectautofinish.com/
See my PT and mods here:
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http://www.imagestation.com/album/?id=4289059783
MY EMAIL ADDRESS: stephenlarson@adelphia.net