Things they forgot
The XSP-1 has provision for 2 subwoofers with bass management for normal listening but it only has one subwoofer input for home theater bypass operation. So it seems to me they forgot to have 2 subwoofer inputs. This makes the home theater bypass function unusable if you wish to have both of your subwoofers connected to the XSP-1. Your only choice is to send the subwoofer output output from the XSP-1 and your home theater receiver to your subwoofers separately, if your subwoofer has 2 inputs. If it doesn't, a 2 into 1 switch would be required. If you have both of your subwoofers connected to the XSP-1(L and R outputs), you still cannot use the home theater bypass feature for one of them by connecting to the one subwoofer input from your home theater receiver, as the left and right outputs on the XSP-1 are attenuated by 3 db each.That's a deal breaker for me, as the whole reason I'm looking for an analog preamp is for home theater bypass operation. 2 subwoofer outputs with only one subwoofer input makes no sense