I'm sorry, I forgot to ask if you are going to run a mono or stereo system....
Okay, there are two ways to build a VSX preset:
- using a reference microphone and a Fast Fourier based software program like SMAARTLive, you can best pick which crossover point and filters are going to give you the smoothest transition from the subs to the tops. Peavey has made the presets for their speakers but has not branched out to other cabinets.
- find an existing preset and modify it until you like what you hear.
JBL should have some information on what they recommend for low freq cutoff and filter. Getting the subs to the top smoothly is going to be another story unless you measure it yourself.
There is another option, and I do not recommend it often:
See if dBx has a preset already made for the DriveRack for your speakers. If so, I would return the VSX-26 and get a DriveRack and use the preset.