Originally Posted by Sfniner
I'm wondering we're should I set my svs pb13 ultra at 80hz or what ?
Crossover depends on -3dB point of your speakers. For an HT application; setting it half an octave above the -3dB point of your speakers is a good start. If you feel you're having weak bass; raise the crossover.
80Hz is not a de facto; you can choose any value based on your speakers and room acoustics. Also, it's better to use bass management in the AVR and bypass LPF on the sub.