Amplifier

I know I've asked this forum before, but how do I bridge my amp?  As I had it before, I had the subwoofer wires split so that the positives from both channels one and two went to the sub, and same with the negatives.  However, I'm told now that I should instead connect the positive of channel 1 to the sub, positive of channel 2 to negative of channel 1, and negative of channel 2 to the sub.  Which way will get me more power?  I believe the second one, but you guys know more aobut this than I do and I haven't found any help elsewhere on this site.  The hardware, by the way, is a Lanzar Vibe 420 and pair of 12" JBL GTOs.
Thanks for all your help.

Your aplifier has to support a BRIDGED mode. There may be a switch on it that will bridge the amp, or the directions may just tell you to put the positive on the LEFT +, then NEGATIVE on the right - or +. . . Yes, some do that, like my Dolby 7.1 Amp for home, if I am only using one rear center instead of the two rear, then I have to hook it up in that fashion. So I am actually at a 6.1 setup this way.

All my amps just have a BRIDGE button, then a BRIDGE outline on the terminals to where the wires would go in bridged mode.

YOU can bridge a regualr amp using a Relay, that diagram is on this site somewhere.

Problem is, I bought the amp used ($200 amp for $40!) so I don't have a manual for it.  I'll look around on the lanzar website, though, good thinking.  I do know that it does support a bridged mode because it says so on the amp.  At the terminals, it just has brackets outlining channels one and two as one channel, and three & four as the other in bridged mode.

Then follow the outlines, is all I can say. That's what I had done, but my Kenwood AND optimus amps have a BUTTON that says BRIDGE, and the other for the Cutoff frequency for Subs. That's what I use on the Kenwood.

It's a FOUR channel amp then? Bridged is TWO? Just like my Kenwood is, but I still have to have BOTH bridged buttons pushed. SOme do not have a button, just SENSE the bridged connection, and to it automatically.

I have a 400Watt Kenwood, FOur channel, two bridged.
I have a 200Watt Optimus, Two channel, one bridged.

They both have the OUTLINE for the wiring in BRIDGED mode, they both have a button for BRIDGED mode also.

not many amps these days have a "bridged" button, but most are capable of being bridged...

if your amp is a lanzar from within the past 5 or 6 years it should support being bridged without issue...as stated above, just use the left positive and right negative leads on the amp and you will be good to go...

Got it now.  Thanks for your help.