Im looking at 12 x 100watt horn transducers. This is for an ultrasonic cleaning tub. If the total wattage is 1200 watts for the gen, should I put the transducers in parallel or series? Thanks.

 

Parallel or Series connections are a moot-point.
How You will generate the Power, and the Voltages and Current levels will vary.
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Ok, didnt know if it was standard to connect one way or the other. So what specs should I be looking for? Thx

 

You want an Isolated-Square-Wave-Generator that can comfortably produce ~1500-Watts,
and has an Adjustable-Output.
In case you haven't seen something like this ...........
it will be HUGE, HEAVY, and seriously expensive.

How much Money do You have to spend ?

First, obtain a Specification-Sheet on an individual Transducer.

Since You will be using 12 of them, it will probably be best to drive them in parallel,
or maybe even create an individual Driver for each Transducer.
But all of the Drivers will require a Power-Supply.
1 big Power-Supply is generally cheaper, and takes-up less Real-Estate, than 12-smaller ones.

The Driver-Circuitry can not be safely designed without a Specification-Sheet for the Transducers.
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How will you prevent destruction of your hearing? 20kHz is not ultrasonic, instead it is sound that will be extremely loud.

 

We don't know the Resonant-Frequency of the Transducers yet.
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As a "cheating trick," you can ask the transducer manufacturers if they have a preferred driver circuit to match the transducers you are buying. Probably they do.