Sooo I have this pr of old midrange cones, not sure what the mfg is. There response is confusing me. I mounted on a large approx 2 ft by 3 ft 3/4 in mdf board to take some measurments using the Omnimic. Going down in freq. the response is reasionably level then shelfs down approx 5 db from 2khz to 1khz then is level again untill about 500 hz then falls off . HOWEVER when I mount one on the cabinet ( 9 inch wide x 33 tall) I get a flat response down to about 700 hz. What happened to the shelf down at about 1.5k?? It seems to me if it was going to show a shelf down it would be on a small baffle not the large one ?