Originally Posted by
Fast4esT
Check out alpine pdx5, it’s 5 channel amp. You can wire in rca cables from stock headunit to amp. You can use the factory speaker wiring for the rear speakers but will have to run new speaker wire to front doors since you don’t have Bose. The 5 channel amp will provide power for 4 speakers and a sub. You do not have to upgrade speakers right away
I have a PDX F5 (as well as a PDX F4), it's a great amp small enough you can tuck it pretty much anywhere and plenty powerful enough. Assuming you have a Symphony II and not a II+ you can tap into the signal wires at the stock amp to get some RCA cables to connect to an aftermarket amplifier. Depending on your stock amp will determine which wires to tap into, but it should be pretty straight forward.
Originally Posted by
Jaylen11
1) Speaker upgrades do improve quality of music. -but will the HU affect the quality negatively? Currently looking for good speakers on Crutchfield.
2) Subs are a must. -but what does an amp do and is it a must as well if I’m putting subs in?
3) HU upgrade is fairly optional -I like the old aesthetic of the car and don’t want to have a modern looking HU on my A4 (not even the touch screen eBay one with Nav)
1) The HU can negatively affect the sound, crap in = crap out, but with an aftermarket amp and speakers it is not going to be an issue. The Symphony puts out a flat signal, so you can use that to splice in an aftermarket amp.
2) An amplifier is an absolute must if you are putting a sub or subs in, the stock amplifier will not cut it as far as the bass it sounds like you are after.
3) No need to change the HU unless you wanted to do so.
I would look into a 5 channel amp, pick up new component speakers for the front doors, if you want rear speakers pick up a pair for that as well, or spend more money on the fronts and disconnect the rears. Look into a 12" sub in a ported enclosure, be aware that you will lose a good amount of trunk space doing this though. I have a single 10" in a ported suitcase in my trunk, I still have a good bit of room, but it also eats up trunk space. You can put a sealed 10" sub in the cubby behind the door on the left and then remove the factory sub (if you have one) from the door on the right and install the amplifier in there. I have both my amps behind the left door and a DSP and power distribution blocks behind the door on the right.
This is a good place to start if you decide to just install a subwoofer and see if that provides enough of an improvement that you are happy:
http://www.a4mods.com/index.php?page...es/stereo.html
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