Re: Yet another subwoofer integration question
Is the subwoofer active? Does the full-range signal from the power amp pas into the sub, then on to the SHL5? Or is the sub somehow connected between the pre and power amps?
90Hz probably is a bit high - I'd personally have preferred a lower frequency of (say) 50Hz.
Linkwitz-Riley (LR) describes the shape and sharpness of the filters in the crossover region. As you can see from the graph, the filters have steep slopes (this is a confirmation of their LR nature). As to whether this will effect the overall sound in the all-critical midband, I can't be sure.
One very important thing to keep in mind is this: if the subwoofer and main speakers are at slightly different places in your room (I'm sure that they will be) there will be time differences between the signals arriving at your ears from the sub compared with main speakers. This difference could be of loudness or phase - simply due to the longer/shorter path lengths to your ears and the slow velocity of sound waves equating to phase shifts in the audio band. I'd think that it would be really essential that the sub has a variable phase control that you can experiment with to bring the sound from the sub and main speakers into best possible phase (time) alignment.
Be realistic about what can be achieved at low frequencies in a real-world living room.
Alan A. Shaw
Harbeth Audio UK