What amplifier should I use for 2 650W Subs?

What is the watts on the head unit and if its got 50 x 4 channels that should be enough to run the front dash and door speakers if not then a 4 Channel amp while do the trick but if the head unit has the 50 x 4 channels witch is 200 watts and it does fine running the dash and door speakers all you need is the amp to run your subs and make sure you tune it well cause that makes all the difference also...

There could be several reasons why the head unit for your car does not work. The most likely issue is that the head unit is not compatible with your stereo system. You can consult your vehicle owner's manual for speaker issues.---------------------------------------------------------------------------------------
Diagnostic VAG

you cna switch the working rca's to the sub out put to check for sound if u get sound it means your rca's are bad but if no sound then your other outputs in your radio may be deffective

depending on how many channels the amp is, you may not be able to hook everything up to it.

usually you have a separate amp for subs. 4 channel amp for the speakers in the car, and a mono amp for the subs.

To hook them all up to the same amp you would need an amp with 5 channels. It wouldn't work out right.

If you have a mono amp its only for subs.

If you have a 2 channel you can either hook it up to the rear speakers or bridge them to mono to run the subs.


you need a channel per speaker basically.

IMO, I suggest for head unit go for pioneer that also goes to the seps and mid speaker. for subs and amp try getting a kicker.

pioneer head units only distribute like 200 rms or so to the speakers. you might have to find a blue maybe even blue with white striped wire and nick it just enough to tie your amp wire around it. tape it up and see if it works.

Head unit - JVC Camelion
Front - Sony Xplode 4 way 8" 150w (will need door pods)
Back - Kenwood 7x10, 4 ways, 320W, (these will act like subs for you)
Wiring - Make sure you use competiton wiring in the system.

Also here is a site to help you install

http://www.ehow.com/how_5829_wire-car-stereo.html

The wiring is fairly straight forward. Along the top row of the ten pin plug =
(Left to Right)

Front Left positive,

Front left Negative,

Control wire from your stereo head unit should be thin blue wire sometimes listed as Remote Wire this switches your amp on and off via your head unit so you don't run your battery flat,

Front Right Negative,

Front Right Positive.

Bottom Row=(Left to Right)

Left Back Positive,

Left Back Negative

Centre Nothing

Right Back Negative

Right Back Positive

These are all inputs from your head unit.

To bridge from 4 channel to 2 you connect

one left speaker to Ch B Left Positive and Ch A Left Negative

one Right speaker to Ch B Right Negative and Ch A Right Positive

Ten Switching the Input Select switch to 2CH

Alternatively if your unit has RCA's on the back of the Head unit you can use them to run your subs.
Hope that helps.

you could try to wire the subs in a series which all positives are connected in a line from amp to pos of sub to pos of other sub , same for the neg.
heres sum extra reading materials:
http://www.crutchfield.com/ISEO-rgbtcspd/learningcenter/car/subwoofers_wiring.html

I Had That Happen To Me Its A Ground Problem. Check The Negtive Speaker Terminal And The Ground Wire Runing To The HeadUnit This Should Fix It.