What might be ballpark L&C to make a 1K2 lowpass to get some "boost" ?

I have a little horn loaded with a Tymphany 10" speaker which has to mate with a horn and B&C DE25. The Tympnayh could use a bit more output in the 1K or so region. (will look at hornresp)

It will be driven with a TPA3255


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What you want to do seems reasonable, ie using a higher Q filter to fill the knee.

It's not so clear what is to be done about the impedance peaks, they don't have to be a problem. If you plan to attenuate, it can help to know in advance.

I'd suggest tracing the impedance and response for starters.. or we could help with that.