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Old 12-04-2019, 02:33 PM   #1
Scooby Newbie
Member#: 431543
Join Date: Oct 2015
2003 WRX

Default Speaker and Head Unit Upgrade

Replacing head unit and speakers
If I were to upgrade my oem speakers (rear and front) also, head unit. Would I need to buy an amp ? Im currently looking at this list. I want to know what else I need to do to buy these aftermarket purchases. New wiring harness as well? 03 WRX Sedan



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Old 12-04-2019, 02:49 PM   #2
Scooby Newbie
Member#: 337836
Join Date: Nov 2012
Chapter/Region: NESIC
Location: West Hartford, Connecticut
2002 WRX Wagon
Aspen White


You dont need an amp, but the headunit you have linked has an output of 16 watts rms which means you wont notice much of an upgrade from your oem system if it all still works fine.
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Old 12-05-2019, 11:11 PM   #3
Scooby Newbie
Member#: 497099
Join Date: Jan 2019
Location: TN
2007 Outback Sport
Urban Gray


Crutchfield gives you the harness with the headunit, I am also a fan of the posi-products twist caps to secure the wires together too. I just upgraded mine in my 2007 and didnít use an amp, and I had the premium set up from factory with the upgraded speakers. Still probably not great but the head unit alone made them sound so much better. If I were you Iíd splurge on a nicer head unit and see if you really want speakers, a 20RMS or so headunit is a good buy, and if you get a CarPlay one (the Sony XAVaX1000 is what I got) it is super convenient too! With the one you have, you would have to run wires from behind for any kind of physical connection, if that matters to you.

Thereís a thousand opinions on car audio, thatís just my thoughts
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