amp and ohm

Uh... no.  Subs are loads.  Their impedence (ohms) are fixed.  Amps deliver current into the load.  Amps can only operate into a load greater than their minimum stable rating.  So if your amp says it is "1-ohm stable" then you must place greater than one ohm load on it.  Connecting three 2-ohm subs to a single amp will place either a 6-ohm total load (all three in series) or a 0.66 ohm load (all three in parallel) on the amplifier.  Not a good thing.

I recomend you read through the basics section and the car audio introductory sections of this web site.  See links to the left.  Or, get help from a professional install shop in your area.  It's better to get help than to fry your equipment!

Cheers!

No, it'll give you 6 ohms.  Conencting that to a stereo amp in bridged mode will place a 6-ohm load on the bridged amp.  But where I think you're going it each channel will operate at its 3-ohm rating.

Placing two woofers in parallel and then one in series to achieve a 3-ohm amplifier load is not a good idea as one speaker will always be louder (the one in series.)

The circuit Tekken describes would be wired like this:  Speakers 1 and 2 in parallel and speaker 3 in series.  + from amp to + on speakers 1 and 2.  - from speakers 1 and 2 to + on speaker 3.  - on speaker 3 to - on amp.  All system current will always have to pass through speaker #3 and it will always be louder and will dominate the sound of the system.

The "best" load with three 2-ohm subs and an amp that cannot handle fractional ohm impedence loading is 6-ohms, all three in series.