[The Kid!]

Originally Posted by rockabilly69

I send a full range DI signal to it and it works fine, and it has both parallel and crossover'd outs if you want to send a signal to another smaller HF cab...

https://www.schertler.com/en-US/shop/amplifiers/bass

You shouldn't be sending a full range signal to the sub unless it automatically filters out anything above (approx) 100hz. In that case, the tops should have a high pass of 100hz.

It's still better to use an active crossover. That way you can even select the freq and balance the sub and tops. Rolls makes a tiny two way crossover that I keep right on my board for when I run my sub.