Use Subwoofer crossover or processor crossover?

Since you havea DD18 that makes things more difficult!
with a typical sub I would say Processor would be the one to set the crossover and slope... but since you have a velodyne with microphone.... you need to use the process with the velodyne which will allow you to integrate the volumn and everything (including crossover) by using the microphone that is included.... Follow their manual to the "T".. your results will be pretty close to amazing!

Synergy or Integration is key!
Chris

PS: the DD18 is awesome for movies!!!

I used to own a Velodyne DD-15 and Velodyne suggested that I use the processor's crossover for best results. BTW, how do you bypass the crossover in your pre/pro anyway???

Unless you have a feature that can be turned on or off, you can bypass the crossover in your pre/pro by setting the crossover point to the highest value (i.e. 199 hz or what ever the highest value is). You then use your subwoofer from your sub to integrate with your speakers. Have fun...

I run 5 equal channels in LARGE and use a pair of subs for the x.1 signal only (crossover fully bypassed). I use my DVD Player's DAC for my main listen (audio out) and bypass my receivers DSP all together.

When I upgrade my AVR I plan on using the receivers Front L/R pre-outs to the sub's Line-In, employing the sub's crossover to help fill the bottom end of my front speakers. Hopefully this will smooth out my rooms low end response (the current graph looks like a mountain range).