I use a Mesa Boogie Road King 2x12, quip a hp v30 closed and an open black shadow 90. Following a trial I would like to replace the black Sadow by Electro-Voice evm12l. Or on the mesa 1x12 cabinet is closed what will be the impact (since the mine is open)? What Difference between open and closed cabinets in sound? Change a black shadow with a 90 m EV 12l es) that good idea?