Kenwood how do you connect this amplifier to get a better sound what size of gage wire should i use. im running two 12 inch tipe e alpines with a pio neer head unit.

Bridging an amplifier refers to combining the power of two channels to run one speaker at higher power. If it is wired correctly, your amplifier is running with 4 channels bridged into 2 speakers now.

I'm using that Alpine right now for 2-12" subs and I have compared it to 6 or 7 other amps this month and most were 4 channel 150Watt/Channel Bridged to 300Watts x 2 and found the Alpine to be superior in both sound quality and loudness. The Alpine has also not turned off even with full volume for hours at a time, Very solid amp I was very surprised due to it's size!

As far as I know, your sound will drastically improve if you run them +- and +-. Connect the one speaker correctly (+-) and then with the music still playing, try swapping the wires on the other speaker around and see which sounds better + to + or + to -
Hope this helps

your amp isnt stable at 1 ohm so you have to wire your subs in parallel

You can, but if you wire them in parallel that is a pretty heavy load on your amplifier. It may even sound better to use one sub until you can get some more power behind them.

Rule of thumb, you can never have enough power! Check out my tips on wattage.

your ampifier is in protect mode, try to dettache the speaker and turn on it.if the green ligh on ,one of your speaker is deffective but still the red light on theres something wrong with your amp.

bigger the better my friend. Look at your Peak RMS output, and how long of wire you need. Then you could make the judgment call on how thick or what gauge you need. (2 involved factors power + distance). id say 10 gauge and you would be fine.

That amplifier is 900W x 1 @ 2ohms.
If your subs are 4ohm SVC wired Parallel, resulting in a 2 ohm load, each sub will only see 1/2 of the rated power. (450W ea.)
Your gain (sensitivity) setting should be between 75% and 85% to max. You will be fine.

Sounds like you shorted out the main power wire somewhere and killed the amp. Is the amp on the fuse intact or blown? Do you have 12 volts at the amp? check you connections and see if it helps.

Connect the 2 gage to the battery thru at least s 50 amp fuse, then connect the capacitor in line before the amps. Then run the 2 gage to a connector/splitter block and run 4 gage leads to each amp. You also will need at least 4 gage ground leads from each amp to a body grounded bolt or screw. You need to run a quality set of speaker leads from the head unit to the amps. The speakers will need separate leads from the amp to each speaker.You will need to try some different combinations to get the sound and bass you want. You want to be able to fade from front to rear and control everything thru the head unit.
Use a hole saw to cut a 2 to 3 inch diameter hole in the side of the speaker box for a port to get a better punch from the sub.
Hope this helps some....