Hi there TBs.I have an Peavey Tour 450 head and want to play with it through my Ashdown 550 Spyder combo for next few weeks (got no money for cab now

) - mean to use only speakers, so is it good idea to plug out the cabel coming out from my Ashdown cab and use it to take Peaveys signal or should it be connected through send and return inputs-if yes what is order to?Just to mention that there is PRE/POST switch "toggle" on this Ashdown if that could help.Thank you very much