Studio microphone large diaphragm microphone series akg project studio line dimensions 54 x 165 mm weight 530 g suitable for recording studio acoustic guitar vocals brass instruments home recording transducer type condenser directivity cardioid noise level 155 db sensitivity 1khz 20 mvpa impedance 200 ohm frequency response 20 20000 hz plug xlr operating controls level lowering switch low cut filter function noise squelch