Oskar Heil visited our booth in Los Angeles back in 83 or 84. I remember him telling me that he was looking for
several million dollars to develope a low frequency Heil transformer.
Herald Electronics was a retailer of woofers mids ,tweeters , crossovers and other electronic parts.
They got their goods from manufacturers in the USA and Asia. The owner introduced me to people
in the speaker business and that was how I got my start building loudspeakers.
Google L-pad calculator. The first result has the calculator and configuration you need. Try 3 db or 6 db and see what happens,not expensive to experiment.
Brings back old memories. Muscle magnet was a brand distributed by a company called Herald Electronics. I used to buy woofers from them 50 at a time.
The owner got me started with Myron Heppner ,one of the owners of Heppner Mfg. They were great loudspeaker company.