Both ways to set up your subs and mains involve the crossover settings. If your sat's are rated down to 80Hz, then it's a good starting point, but in the OP's case, his sat's are rated at 120Hz, so as already suggested, a setting of at least 120Hz would be good advice. The first way to set up your system is with a crossover controlling both your main loudspeaker’s low frequency roll-off and your subwoofer’s high-frequency cutoff. Setting the Subwoofer / LFE Crossover for Best Performance by Gene DellaSala — August 29, 2004. The -3dB frequency is the frequency you want to use when setting your subwoofer crossover – in the case of the LS50 that would be 79Hz. Most of today’s systems have an EQ feature that will set up the proper crossover automatically based on the specifications of your speakers. The crossover on my Kef eggs/KK DXD808 combination is set to 120Hz (despite the Kef's being rated down to 80Hz) without the sub being locatable. Crossover is the frequency where speakers begin to roll off, and the subwoofer starts outputting bass notes and LFEs. This can be done several ways, but all involve using a crossover. Subwoofer Subwoofer Setup How To Setup A Subwoofer In An Apartment Tips For Getting the Most our of Your Subwoofer 0 comment(s) A major challenge for music and movie lovers who live in apartments or townhomes is striking the balance between getting the full experience from your audio system and being a good neighbor. Setting the correct bass management on receivers and processors is essential to getting the most out of your audio system. Some will say that you should set the crossover point 10% above that -3dB frequency, but with decent quality components it’s really … IMHO you should have your speakers set to Small in the Onkyo and the Crossover Frequency dial (LPF) on the subwoofer set as far clockwise as it can go and just use the crossover in your Onkyo TX-SR608 to low-pass the subwoofer. Setting the Crossover.