Can someone please explain to me why so few sub manufacturers offer defeatable crossovers? To me it is entirely an unforgivable omission. Who in this day and age doesn't perform bass-management in the digital domain of their pre/pro. The vast majority of sub users are forced to cascade the crossovers in the sub and the processor which is, believe me, not a great idea. I had the ACI Titan sub (no defeatable x-over) for a short while - There was no way to get the thing to integrate properly except to feed it full range signals from the left/right channel outputs. Sent it back. Just don't get it. Perhaps the Dahrman (sp?) guy can help us understand why he didn't include this feature in his sub?