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hartke question

Hello fellow bassists. I have a question. I have a hartke 215 cabinet that runs at 400 watts at 4ohms. Now if i wanted to add a 210 cabinet that handles 200 watts at 8 ohms how would i do this.? i am running on a peavey markVII head at 350 watts at 4ohms right now. So would i have to get another head and run the 210 off the extra head. My question is the 2 cadinets are different ohms so i am thinking i would need 2 separate heads to run both cabinets together does this sound right? How do i bridge 2 heads together by the way I have never had to do this before.
 
Being the 2x15 is 4 ohm and the 2x10 is 8 ohm, the 4ohm 2x15 will draw twice as much power and the 2x10 only 1/4 the power. This may not give you the balance you are after. You'll have to try it out 1st to see if you like it. The other issue may be the minimum ohms the PV will push. If it is rated down to 2ohms then you are OK but, if it is only rated to 4ohms then it may over heat at the 2.666 ohms the above combination will create.