What speakers have I used the crossover on? Anything I can get my hands on! I'm like a kid with a new toy, experimenting with it everywhere.I've used it to cross the HF and LF on my Theatre-3. I've crossed the Delta12LF and midrange horn. Crossed the LF and HF on my DIY JBL speaker. Crossed my Studio-1 with the JBL2235. But I have not crossed anything on a boat with a goat.