i am going to get my new 410's in the morning i can not wait. i going to pit this on top of my 15. the 410 is a crate that i found in a pawn shop for $190 i have played on it and it sounds great, but it doesn't have a horn. can i put one in the 410 and if i can how would i exactly wire it up? if i put an 8 ohm horn will it make the cab 4ohms if it is originaly 8 ohms? what kind would you suggest? how about carvin?