My favorite HU's are Alpine and Nakamichi and usually match them with their respective same make amplifiers that meet my needs. But also like/have used Rockford Fosgate and Kicker Amps in my other cars. My friend has a Soundstream amp and it is impressive. Speakers, IMHO, is a subjective choice. Everything depends on the music you listen to and what you expect/want your favorite songs to sound like. I find all speakers "color" the sound in one way or another. Then some like to argue which is better: 2-way, 3-way, and/or separates. IMHO, IF you have the room and there is no interference with anything, add foam baffles to whatever speakers you finally decide on.
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2002 Almond Pearl Limited Edition PT Cruiser 27K
It's nice to be important but it's more important to be nice.
http://sci-fi.ptenthusiasts.net/

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