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how to wire rear speakers and subs


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gladrock 
Member - Posts: 1
Member spacespace
Joined: January 06, 2012
Location: Australia
Posted: January 06, 2012 at 6:33 AM / IP Logged  
Hi
i need help with my duaghters system install,
The head unit has front and rear pre amp outs but no designated sub woofer out,
I have 2 amps, 1 x 4 channel amp for the fronts, and rear parcel shelf and 1x mono amp to drive the woofer, My question is how can I get the head unit to drive all this, My thoughts are 2 channels for the fronts and the rear channel with a split RCA cable, one side to the 4 channel amp and one side to the mono amp
What are your thoughts
Thanks in advance for you help
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: January 06, 2012 at 8:08 AM / IP Logged  
Just use either or front or rear pre-outs and feed to an amp with a built in crossover that will also run bridged mono. Many are available at all price/quality levels. Also, look up Armour Auto UK, page 212, PC1-615.
ropuma 
Copper - Posts: 102
Copper spacespace
Joined: February 16, 2010
Location: Illinois, United States
Posted: January 06, 2012 at 8:56 AM / IP Logged  
Use the 4 channel amp to run front and rear, use the mono amp for sub woofer and hope that amp has a switch to control base.
i am an idiot 
Platinum - Posts: 13,597
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: January 06, 2012 at 9:20 AM / IP Logged  
Does the 4 channel amp have a 2CH/4CH switch? Does the 4 channel amp have a set of RCA jacks labeled output?
In order to take advantage of STEREO, you must feed left channel RCA to both left speakers. If your amp has none of the things I asked about, you will have to buy 4 RCA Y adapters, and maybe a short RCA cable as well (The latter depends on the distance between the 2 amps)
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: January 06, 2012 at 10:11 AM / IP Logged  
I should have read the question properly.
If the main 1x 4 amp doesn't have outputs, then use phono "Y" adaptors, PC1-320 or 1 female to 2 male adaptors, PC1-2F page 210 same catalogue.
xchrisx 
Copper - Posts: 197
Copper spacespace
Joined: August 19, 2008
Location: Pennsylvania, United States
Posted: January 06, 2012 at 10:34 AM / IP Logged  
An easy cheap fix is just get a Line Output Converter and wire it up to the rear speaker wires (Grey and Purple sets) from the head unit and plug the Sub amp RCA wires into the LOC and use the Front and Rear RCA outputs from the head unit for the 4ch. amp.
bp
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: January 06, 2012 at 10:35 AM / IP Logged  
Which as t5he above post illustrates, more than one way to skin a cat!

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