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Which wire would you recommend?


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leiden 
Member - Posts: 3
Member spacespace
Joined: January 03, 2007
Location: New Zealand
Posted: January 03, 2007 at 9:42 PM / IP Logged  

Hi,

I recently installed a small 85x4WRMS Amp under my drivers seat in my car to power my four 250WRMS door speakers. At the moment I am running the Amps output back up to behind the car stereo to the factory speaker wiring. I would like to run my own wiring to the doors though. I've also got a 600WRMS Amp in the boot that will eventually run a pair of 12" subs when I get around to buying them. I'm currently using 8 Gauge wire to power the under-seat Amp. 

So heres my questions:

What size wire should I run to the 250WRMS 3-Way speakers?

Is it possible to use 2x 8 gauge wires in parallel instead of a 4 gauge wire?
Is it ok to ground to the Amps metal chassis (which is screwed to the car chassis)?
I would greatly appreciate anyone who would have some information regarding my above questions. Thanks in advance! :)

stevdart 
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Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: January 03, 2007 at 10:19 PM / IP Logged  

1.  16 ga. speaker wire.

2.  DO NOT double up power wires to the same amplifier.  Buy a new wire and fuse if you need it.  (..and two 8 ga. does not equal one 4 ga.)

3.  No.  Ground directly into the sheet metal floor pan.  Remove and clean all traces of paint and bolt / screw securely.

You can certainly power the sub amp with a separate power wire.  It would be attached to the battery positive as well as your other amp's power wire, but it must have its own fuse.  In a way, I guess you could say they would be parallel, as such.  But they wouldn't be referred to that way.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
leiden 
Member - Posts: 3
Member spacespace
Joined: January 03, 2007
Location: New Zealand
Posted: January 03, 2007 at 11:07 PM / IP Logged  

Thanks for the reply.

I will purchase a roll of 16ga next week and wire the door speakers directly from the underseat amp. The price difference between 8 gauge ($3.62/m) and 4 gauge ($18.50/m) is rather large so I'd rather use two 8 gauge running side by side and joining at the fuse holder, and the other side on the amp.

So would running two 8 gauge wires give me any more current handling than just running a single 8 gauge wire. Is it worth spending the large amounts of money on 4 gauge?

Thanks.

aznboi3644 
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Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: January 03, 2007 at 11:23 PM / IP Logged  
well your 4 channel only needs 8 gauge.
For a 600 watt amp 8 gauge is perfecty fine
leiden 
Member - Posts: 3
Member spacespace
Joined: January 03, 2007
Location: New Zealand
Posted: January 05, 2007 at 6:03 AM / IP Logged  

Hey, its a 600W RMS Amp putting out 1800W Max. It has 3 25A fuses on the Amp so I assume it needs around 75A capable power wire? Last I checked 8 gauge was only up to around 55A - 60A. I have blown a 40A fuse with this Amp and it wasn't over half volume.

So yeah, would wiring 2x 8 gauge wires allow it to be able to carry more amps. Cheers.


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