How to fit a sub onto a Sony xr-4800 unit

hi, i have a sony xr-4800 head unit, and i also brought some new sony 10" explode speakers 2 put in the doors n back shelf.

i've fitted it all succesfuly and it all works, but now i wanted 2 add a subwoofer in the boot. my head unit gives me 4 speaker output @ 35watts 4ohm per speaker. it also had a remote line input on the back of the head unit.

i would like 2 hook up a 12" 300/400 watt sub to my system, can any1 help me with my problem???

also if i can do this without a amp, plz tell me, if not then its ok, as long as sum1 helps me solve my problem, with or without a amp...

thanx very much 2 any1 th@ tries 2 help, very much appricated :)

hi, thanx 4 the reply, ok, its a: RM Audio RMS530 12" Subwoofer

SPECIFICATIONS:

i hope th@ is of help, thanx once again 4 helpin me

Those 10 inch speakers... are they subs?  If this is the case you'll need at least two amps if you want to add a fifth, and some midrange speakers as well.  Even if they're full range speakers, you should get a 4 channel amp as the deck won't power them well.

no sorry, the 4 x 10" ones i have in there now r full range, i just wanted 2 add a sub 2 give me the bass and let the other 4 give me mid/high range...

its only the 1 sub i'd like 2 put in, but i've looked around on the net and they talk of RCA output on the head units??? the 1 i have (sony xr-4800) does not have any, just the 4 speaker outs i'm using, +ve switched, +ve constant, -ve/ground, ilumination (not in use), arial and remote........

i cant figuer out how i would get a sound input from my head unit to 'a amp' sutable for my sub.

i'm very sorry lol, when i say 4 x 10" i mean 4 speakers th@ r 10", 1 in each of the front doors and 2 on the back shelf..... so really i could say take the rear Left +ve/-ve as the left RCA to the amp and take the rear right +ve/-ve as the right RCA to the amp???

and then the amp will feed the sound out 2 the sub??? i was thinking of th@, but the out put on each channle of the head unit is 35watts @ 4ohms, will th@ matter??

yes the output definitely matters, and you shouldn't run subs with a deck.  Those 10" speakers, even though they are full-range, should be powered by an amp.  Check the power handing of them and see what it says. 

Connection-wise, that's exactly what you would do to hook up a LOC.  One side of the LOC has speaker wire and the other has RCA's.  The power from your deck shouldn't be a problem.  Something else you can consider is getting an amp with speaker-level inputs.  Then you can take the speaker-wire and plug it directly into the amp, saving you the trouble of a LOC.

ok cool, did  u have any amps in mind?? on the cheap range

the speakers in there now r sony explode 1's, the RMS is 25watts and the peak is 140watts

sony explode 1's...... hmmm.... never heard of them.  I did a search and couldn't find anything, so I can't help you there.  Those power ratings seem a bit weird for a speaker as well since the rms should be roughly half of the peak.

As far as which amps to recommend, I can't really say because I have no idea what is sold over in the U.K.