If it works, I'd make a hard pass on Harrison and go for partsexpress/Dayton crossovers. they are speaker level, however, and you can purchase from individual components to fully assembled.
I used some of harrison attenuators years ago and they were ok. But look at their website, they have more options. Unfortunately I find their website unprofessional, which may or may not reflect on their products. For one, it looks like it was created in the 90s. hlabs.com