4 channel amp with one sub

Got a legacy 600 watt 4 channel sub. Was wondering if there was any way I got bridge both channels and run one sub to get max power???

i am guessing you mean you got a legacy 4 channel amp and a sub not a 4 channel sub   haha..   but no you can bridge a 4 channel amp to one sub unless it is a DVC and last i checked legacy didnt make a DVC sub. you will have to run it off 2 channels those you can bridge if you amp will run a 2 ohm mono load.....figureing this based on most legacy subs are 4 ohm,    you need to let us know the model #'s and bridging capacity of your amp and what model sub2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

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Why would the amp need to be able to run 2-ohm mono to bridge 2 channels into a single 4ohm sub???  Wouldn't the amp simply see 4-ohms when bridged?New Project: 2003 Pathfinder

if it is bridged each side would see a 2 ohm load.    some legacys wont even do a 2 ohm load bridged2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

The sub is a pioneer I tried bridgeing channel 1,2 and 3,4 but the sub don't work

jeffchilcott wrote: if it is bridged each side would see a 2 ohm load.    some legacys wont even do a 2 ohm load bridged

I'm sorry, your statement is wrong. 

"Some people say that when an amplifier is bridged onto a 4 ohm load, it 'sees' a 2 ohm load. While it is true that the same current flows whether the amp is bridged on a 4 ohm load or a 2 ohm stereo load, the amplifier is driving a 4 ohm load across its outputs. A single 4 ohm speaker can never be a 2 ohm load."  http://www.bcae1.com/bridging.htm

I think you mean to say this:   If the amplifier is 2 ohm stereo stable (stable with 2-ohms on either of the stereo channels), then it is 4 ohm bridgeable.

Almost no amps are 2-ohm stable in bridged mode.

New Project: 2003 Pathfinder