My wife and I own a pair of the Near 50se MKII. The impedance of the MKII is 8 ohms, with a sensitivity of 86db/1 watt. This is different from the 1st generation which had a sensitivity of 90db/1 watt. The cause for the change was work on the crossover that reduced a slight midbass hump. The speakers are very easy to drive. I have used 90 watt integrated amps with them with good results (Anthem Integrated 2) as well as larger amps (Mesa Baron and Adcom 5802) also with good to excellent results
