Dear Stan,
The difference between the K 240 studio and the K 240 monitor is the impedance the monitor has 600 ohms and the studio 55 ohms, also the sensitivity is different monitor 88 dB/mW and studio 91 dB/mW. In the studio version is now built in a new capsule with varimotion technology and so the audio bandwidth is raises up to 15-25.000 Hz, but the sound of k 240 monitor and studio is the same. Also new is that the k 240 studio has now a plug on cable.<>Best regards,
HapeS
prodmgnt@akg.com