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picked up a dbx223 crossover I want to try it out would it be possible to just sit it on the sub bring input speaker cable to crossover and out to sub..or do I have to put it in front of the amp....

Well they are rack mountable for a reason.

Most that use crossovers have them racked in a case with their amps.

Technically you can place it where ever you like but the best option is to rack mount it and keep it safe.

Generally you would stick you crossover between the mixer & amps ie mixerr outputs to the crossover inputs. Low/LF SUM out to the sub amps & high out to the main cabinets amp. DO NOT connect a speaker cable to it. It is a line level only.

Do you have a separate amp for your subs & top cabinets? Or are your speakers powered?

For testing purposes the unit does not need to be racked.

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yes I do have a seperate amp or the sub, did'nt think about the cables ...thanks

Ok then your mixer to the crossover. Crossover high to your main speaker amps, crossover low/LF to your sub amp.
select the switch in back to 1X & adjust the frequency to anywhere from 75-100hz. THen you can adjust the individual levels from the front. Starting with both at zero level - if you have to cut the volume of one rather than boosting the other if you have to match.

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