you can do it passive. no idea with your ampli, but if it does have a bridge then you can hook your eq there, series. if it doesn't have then via tape monitor 2 of your kenwood.
onkyo recvr tape 2 record to - kenwood eq in
onyo recvr tape 2 playback - kenwood eq out
that's all. if you want your eq to be active, then switch your reciever to tape2, all selected input in your reciever will by pass through your eq then back to kenwood. you dont have a function for tape 2 input then but your eq will have an extra input for tape, that you can use for your second tape, it will be active only if your reciever is set to tape 2. i hope you got it right.
post back if you got it done