You don't have to pay for Audiolense unless you choose to use it in the end. There is a satisfaction guarantee attached. The purchase fee is like a deposit; You can get a 100% refund if you are not satisfied.

Or you can send me a mail and maybe we can find a way where I can generate a set of trial filters for you. But that will only be a first taste, and not likely to produce the best sound you can achieve with Audiolense. Crossover optimization introduces quite a few significant variables compared to tweaking a set of passive speakers.