Originally Posted by Nyal Mellor
If you measure the main speakers by themselves you can 'craft' the sub crossover to fill in the bottom end. That's how I do it when I integrate subs into a system without a crossover for the mains. See the blog article
I like using 2-way monitors in my smallish room and have found that they benefit greatly from having 60 hz and below taken off them. It increases their clarity/crispness in the mid-range... and especially when I want to crank the volume!
Most subs I have looked at in my price range don't have speaker output after its crossover. So without an AVR or added digital processing unit it was impossible to crossover from monitors to subs. I could only run monitors full range with the subs in support.
And I would also be dubious on relying on a sub crossover to feed my speakers even if it had one. I have two identical subs in my room that were purchased new at the same time. A while back I thought I had blown one of them because it was sounding very muddy and booming compared to the other one that was very tight and tactile. Turns out the problem was that the low pass filter bypass switch had been knocked and the sub's low pass filter was active (even though it was set as high as it would go at 120 hz) Flicking the switch back to 'bypass' instantly solved the problem. I was astonished at the difference between the digital crossover in the AVR compared to a physical low pass filter.