Alright vamp I see you have another pointless person replying who won't give
you a straight answer over 4 messages.
At the moment mate for cheapness sake i just wired both my RCA outputs (L +
R) into 2 splitters then into the amp to pump the sound to Front and Rear
channels (2 6 x 9s (Front 1ch + 2ch) and a bridged sub (Rear 3ch + 4ch)).
This is only because im using a cheapo head unit with a high to low
convertor (only gives 2 RCA out).
Are you sure you've wired up the sub to the amp right? Youll no doubt need
an amp (just in case you were wiring from head unit straight to the driver).
Some subs have an inbuilt amp though.
When you say it doesn't work what happens exactly?
Matt
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for a friend really. mate has a new head unit with a sub
out
but
the
head
unit sub out is a single
RCA but his sub is a double? he tried a splitter but that
didn't
work,
is
there a special way to
wire it up?
Sounds like the blind leading the blind, take the car to a
specialist or
wait for some other to answer your post, you wouldn't like
my
real
reply....
bit harsh mate, i managed to hard wire his wires to an ISO
connector
but i
don't mess with amps,
well not yet 
exspect more stupid questions i'm affraid
The fire service can be called free by dialling 999 or 112,
check
the
car is
insured for fire damage.
funny ****er aint you but i see no where on the newsgroup where it
says no
newbies.
There is nothing wrong with being a newbie at all, but from what you
typed
earlier, both you and your friend should not indulge in diy when it
comes to
ICE, quit the arguing as anyone coming to view the thread will only
join an
argument and your original issue will not get resolved, note i have
answered
your originalquery by suggesting you take the vehicle to someone
that
knows
what they are doing.
it's not that i'm completely clueless, i'm very unlikly to wire an amp
up
without an inline fuse for
example and i wired the ISO via a pin out map i found just when it
came to
the sub it throw me off a
bit.
anyway arguments aside is there a way to wire this to the head unit?
Yes.
you mean if i use a Y cable or just plug 1 RCA in it'll work
thanks 
and i got that in another non car audio newsgroup!