Can you put 2 Audio IC's In Series for louder DB?

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I guess if you're only wanting just one frequency, you could get an array of cheap little horn tweeters like this:

2 Units Pair Piezo Horn Tweeters 85 x 85 x 70mm High Impedence Power Max 15W | eBay

depends on what your project is if you need high Fidelity sound or if these are good enough. you can pump allot of power into say, 10 of these; that's allot of spl.

I've used something like these before. they're peaky, brittle and relatively directional, but they are loud for what they are.
 
It would help to know specifically what the tone is for, as geraldfryjr said, it makes a big difference depending how far it needs to carry. If this is some kind of experimental application, maybe testing the resonance of small objects, then perhaps they are within an inch of the driver in a sealed system, so it could be possible. Why one tone and specifically 10kHz (or 2kHz)?
 
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