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Old 03-13-2013, 06:26 PM   #1
pooky
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Default Question regarding speaker installation

Well, I started my audio project on my WRX. I just have a quick question regarding the speaker installation.

I bought an independent amp solely for the speakers(fronts/rears). Question is, do I ditch the factory plugs that was in the stock speakers/tweeters? Since I have an amp for just the speakers do I trace new wires from the amp(in trunk) to the speakers/tweeters at the doors?

So to make sure I got it correct, this will be the way I connect everything:

Sub amp connects to Sub
Speaker amp connects to all 4 speakers(fronts are component)
Sub amp & Speaker amp connects together via "remote"?
Head unit connects to either amp(remote also)?
Battery wire(4awg)splits off to the ground/power for both amps
Ditch the stock speaker connectors in doors

Please let me know if you think there is a fault in the direction I will be connecting everything. If you need additional information let me know. Thanks again for any and all help.
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Old 03-13-2013, 08:02 PM   #2
konradlip
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You can use existing wires if you like the easy way out.
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Old 03-16-2013, 12:17 AM   #3
Drink15
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As far as speaker wires go, there was a topic that went over if the stock speaker wire is ok. If I remember correctly, the stock wiring is ok up to a certain wattage. Cant remember what that is.

With out knowing what wattage your running to the speakers, its hard to suggest running new or keeping old.

Also, consider running the tweeters off the radio and not the amp.
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Old 03-16-2013, 09:15 AM   #4
luan87us
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You don't have to ditch the factory plug and wires. They'll work for you application. Buy a 20 pin combine harness from ae64 so you won't have to splice your factory harness.
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Old 03-16-2013, 11:31 AM   #5
klarowe
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The easy way is to just run speaker wire from the amp to the back of the radio... connected to the vehicle side of the radio harness (NOT the radio side). This way if you ever decide to revert back its easy to do. Unless you are going full competition status, you will never hear a difference in quality. The only time I've ever fully rewired a car was for 2 competition vehicles and one really old car where the factory wiring just crumbled in your hand. Otherwise it was always to the back of the radio. Make sure to run power wires and signal wires on opposite sides of the car. And use a factory bolt with all paint sanded off for your grounds.
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Old 03-16-2013, 11:33 AM   #6
klarowe
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What amp kit and RCA's are you using? There is plenty of crap out there to avoid like the plague.
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Old 03-23-2013, 12:57 AM   #7
stDragoon
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I would run new wires. Factory wire isn't meant to handle the power from an amplifier.
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Old 03-23-2013, 08:59 AM   #8
klarowe
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Wrong. Factory wires are completely capable of handling the additional power from 90% of the amps out there. You MAY lose some signal quality, but it won't be anything that the human ear can pick up. The only time you need to worry about changing the wires are for competition or if the factory wiring is bad. I've seen plenty of competition vehicles that used factory wiring with no issues.
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Old 03-23-2013, 03:27 PM   #9
stDragoon
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Quote:
Originally Posted by klarowe View Post
Wrong. Factory wires are completely capable of handling the additional power from 90% of the amps out there. You MAY lose some signal quality, but it won't be anything that the human ear can pick up. The only time you need to worry about changing the wires are for competition or if the factory wiring is bad. I've seen plenty of competition vehicles that used factory wiring with no issues.
Stock wires are what 20ga? (not even going to get into quality and inflation)
Anything bigger than 50 watts is going to have a loss.
Using a 20ga instead of a 16ga will cost you 10% of your output to resistance.
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Old 03-23-2013, 07:56 PM   #10
klarowe
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Yes, you will have a loss, but not enough for the human ear to hear a difference (unless you are a complete audiophile). I've seen many competition installs that maintained the factory speaker wiring without any loss. I've also installed hundreds of amps, a few that included a full rewire and I never heard a difference. In my old Dodge ram I had a Kicker 5 channel that was pushing around 75w rms to each speaker. After my factory wiring had issues (typical Dodge Ram broken wires in the door jams) I rewired it with 14awg speaker wire. I did not hear any difference in sound quality... and I normally hear the imperfections that most don't. The OP can do as he pleases, but the added time and cost just isn't normally worth the tiny difference you may have.
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Old 03-23-2013, 09:37 PM   #11
stDragoon
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at 75 wrms you're looking at 55w actually getting to the speakers for a 1.25db loss with stock wires.
with 14ga you're looking at over 70w on the speakers and a .15db loss.
That's almost 25% increase by switching wires. Not to mention the headroom.
Your amp will also be working harder to cover the extra .5ohms (clipping).
I'm not sure what kind of competition cars you were doing but comps aren't really known for their "highs", especially when you use the phrase "unless you are an audiophile".
I've installed countless amps using the factory wires but what it boils down to is there is a right way and a wrong way.
You're running wires as it is, just get them through the boot. Take pride.
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Old 03-24-2013, 10:45 AM   #12
klarowe
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I take plenty of pride... I wouldn't be able to open my own business if I didn't. I am not arguing that it is better to rewire each speaker, but it is typically not worth the hassle and added cost for the slight difference you will see / hear. And by competition I am talking SQL not SPL.

IF the factory wiring is only 20awg (most is usually 18awg) then there is a .08ohm resistance per foot. At a 12 foot length, that's a power loss of 7.5w. Rewiring the system with a 16awg speaker wire (.04ohm / foot resistance) would give you a power loss of 3.8w. So in the end you are realistically only losing about .5db by using the factory wiring (assuming it is in decent condition without heavy corrosion anywhere). The average human ear will not hear a .5db difference.

Here is a nice little calculator that I've used before. You can enter in all of the information (power output, speaker impedance, wire size) and it will give you everything including the dB loss. http://www.bcae1.com/images/swfs/spe...rassistant.swf

The only possible issue is that if it is only 20awg then it won't meet the 300 circular mills per amp of electrical current standard... but it just barely doesn't meet it so there really isn't anything major. Plus, most factory speaker wires are 18awg (not sure exactly what Subaru uses).

Last edited by klarowe; 03-24-2013 at 10:52 AM.
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