Have 600w amp 2 10's and they aint even bumpin, DO I NEED TO BRIDGE IT

you need to bridge it. this will allow both speakers to be ran to the amp and it will distribute power from the amp evenly you should see a bridge port in your amp

I'd need to know more about the amp, but don't forget, amps are rated as their max power...
So lets take a 300W/channel stereo amp at 8 ohms.
Ok, it's stereo, so there's 600W
But the amp is capable of 4 ohm loads...well, now you can deliver 600W/channel, for a total of 1200W
In this scenario, your amp is doing exactly what it was designed to do with those speakers.
If you wanted to get the full 1200W out of the amp, you'd have to hook up 2 more speakers in parallel to the ones already there. This drops the impedance to 4 ohms per channel = 600W / channel.
Yes, the power is split among the apeakers...300W per speaker into 4 speakers = 1200W
so any way you look at it, there's your 1200W

Make sure the ground is securely fixed, power cable too. Also check the ohms of each speaker and the output of the amp. If you have two 4 ohm subs (2ohm load) running of the bridge of that amp, it aint gunna work. Im sure that amp can only run 4ohm. Try not bridging it.

No - it is not 2 ohm mono stable

• 1000W max power
• 165W x 2, 20Hz - 20kHz, @ 0.04% THD + N, at 4 Ohms
• 200W x 2, 20 - 20kHz, @ 0.15% THD + N, at 2 Ohms
• 400W x 1, 20Hz - 20kHz, @ 0.1% THD + N, at 4 Ohms
• OTL (Output Transformerless) circuit
• Pulse power supply
• Line & High Level Inputs
• .3-6V Level Adjustment Control (RCA Pin Jacks) 1.2-12V (High Level Input)
• 80 Hz, -18dB/octave Low Pass Filter Switch

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make sure ur rca inputs and outputs are hooked up firmly if so u may have an amp or stereo problem

No, thats what you don't what to do. Even if you have 2 matching amps you don't do that. Every amp puts out different, and for 2 subs, you want to play at the the same time. If your only running 2 10's, I personal would just run the alpine (it's a mono amp made especially for subs) thats plenty for what you have. make sure you bridge them to get the full response. And your other amp i would use for your highs or mids, but run it @ stereo , which is 300 w @ 4 ohms. (Note: 600w @ 2ohms would be bridged and would play in Mono)

Building Competition stereo's is a big hobby of mine.

as long as the speakers are wired in parallel it should be ok dont wire them in series as they will overload the amp it is designed to run at 4 ohms

naz, get a hold of crown, tell them whats up. check all fuses and connections first. the unit is worth $900.00. they should be a little understanding.

Features 

• 2-ohm dual (per channel) : 1200W
• 4-ohm dual (per channel) : 900W
• 8-ohm dual (per channel) : 600W
• 4-ohm Bridge : 2500W
• 8-ohm Bridge 2100W

• Indicators for : Signal, Clip, Power, AC Mains, Fault, Bridge, Temp.
• Housed in a rugged, all-steel 2U chassis
• Microprocessor-controlled protection system.
• Flow-through ventilation from front to back.
• Internal heat sinks with forced-air cooling for rapid, uniform heat dissipation.
• EIA Standard 19-inch rack mount width
• Safe with all types of loads.(2 to 8 ohms in Stereo, 4 to 8 ohms in Bridge Mono.)

Inputs 

• XLR-¼" combo connectors: One per channel
• 3-pin female XLR connector and TRS ¼" phone jack accept balanced or unbalanced signals.
• 3-pin Phoenix-style connectors (2-channel models only),One per channel, accepts balanced or unbalanced signals.

Output 

• Balanced XLR connectors (2-channel models only)
• One per channel, 3-pin male XLR connector in parallel with XLR-¼" combo and Phoenix-style input connectors for daisy-chain operation.
• 5-Way binding post output connectors: One pair per channel; accept banana plugs, spade lugs or bare wire.
• 4-Pole Speakon output connector (2-channel models only)
• Accepts a 4-pole Speakon connector.

Your "bumpin" may have killed the amps "bumpin" Was the amp secure when you were sliding? So wires are ok, and lights and finas running. You have power but no output..Check the settings on the amp, also the fuse. Something might be earthing itself to the amp as well.

Power Output (1 kHz*) Stereo Bridge-Mono 8 Ohm 4 Ohm 8 Ohm XLS 802 500W 800W 1600W XLS 602 380W 600W 1200W XLS 402 300W 450W 900W XLS 202 200W 300W 600W *1 kHz Power: refers to maximum average power in watts at 1 kHz with 0.5% THD. It depends on the impedence of the speakers. Carfull as you could burn up this amp if you exceed the resistance rating on it. Go here on all of the specs of this model of crown amps. http://www.crownaudio.com/amp_htm/xlsspec.htm Good Luck