Adapter: 2" compression driver, 1" horn

There is scarce availability of horns for 2" compression drivers without 18TPI screw on adapters.

I'm running my driver at very low SPL but would like to experiment with a wider range of horns. The airflow diameter will be restricted before opening up in this scenario.

I purchased ADM25-50, hoping to couple the horn with drivers, but this adapter is meant to be used the other way around.

Do you know where to find a 1 3/8 male-to-male threaded coupler?

Thanks in advance!
 
Use two adapters:

2" --> 1"
and
1" bolt on (driver side) --> 1" screw on (horn side)

or mount two of the latter back to back,
or chop off the threads of the horn and glue on a DIY adapter plate.
 
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