FAQs didnt have anything.

I have an alpine 4 channel amp.
I know how to bridge the sub on channels 3 and 4
But for my front two do I want to use 1 channel for one and 2 channel for the second
Or should I take the positives of both and put them on channel one positive and take the negatives of both and put them on the negative of channel 2(is this method bridging?

 

use ch1 for one and ch2 for the other

 

You will run the amp tri mode you will have two channel stereo then you will have a bridged mone channel as the third

 

neither of those helped

 

yes one channel for one door speaker, one channel (channel #2) for the other door speaker

the bridge channels 3 and 4 for your sub.

 

each door speaker needs a positive, and a negative. you can't wire two positives to one speaker and two negatives to the other. that's not bridging; that's called setting your amp on fire.

 

I don't get how mine didn't help... you even listed it as one of the options in your post:
Since I don't know how to be much clearer... I'll draw it out for you:

CH1+ Speaker 1 Pos
CH1- Speaker 1 Neg
CH2+ Speaker 2 Pos
CH2- Speaker 2 Neg
CH3+ Sub Pos
CH3- (Empty)
CH4+ (Empty)
CH4- Sub Neg

Of course, you may want to make sure that your amp is capable of doing 3 channel bridging (CH3+CH4 = Sub) before you do this.
-Doug

 

that is not what im talking about

positvie on speaker a
positive on speaker b
going to pos on channel 1

negative on speaker a
negative on speaker b
going to negative on channel 2

 

No, that would be bridging the front channels most likely giving you a bridged 2 ohm load which I doubt your amp can do. Plus you would have mono and not stereo sound. You should have 8 speaker terminals on the amp:

Channel 1: +positive (1)
-negative (2)
Channel 2: +positive (3)
-negative (4)
Channel 3: +positive (5)
-negative (6)
Channel 4: +positive (7)
-negative (8)

Channel 1 goes to 1 front speaker. Channel 2 goes to the 2nd front speaker. Channel 3 and 4 are bridged to you sub (I'm guessing that you have a sub). To bridge channels 3 and 4 take the + of 1 of the channels to the + of the sub then take the - of the other channel and take it to the - of the sub. Your amp owners manual will say which channel to hook to for the plus and which to hook to for the minus or it will be drawn on your amp. If this doesn't help you atleast some then you should have someone else install it for you.

Tell us the model number of your amp.

 

It is what you're talking about... you gave two options in your orig post saying should I do "this" or "that"

What you're explaining is the "that" and what I'm saying you need to do is the "this"... I already explained how you need to hook it up with a wire-by-wire reference so I don't really know how else to explain it (short of drawing a diagram which I'm not going to do...the users manual probably has one in it though), so with that... I'm done and good luck.
-Doug

On edit:
While searching the FAQ (bored) I found a diagram.. go figure: