Audiophilepure

Read Here

“The EQ, of course, affects only frequencies below the crossover frequency to the subwoofer (I chose 80Hz). And most audiophile preamps don’t offer the ability to deal with a subwoofer, which is best used when both high- and low-pass filters are available. You can drive the AF-61s full range and simply cross over the subwoofer itself at a low-pass frequency selectable in the app, but that could well make it more difficult to blend the outputs of the sub and AF-61s. This arrangement, in which both the main speakers and the subwoofer overlap across a wide range in the midbass, is one reason audiophiles often have problems incorporating a sub, abandon the effort, and become convinced that subwoofers have no place in audiophilia.”