Vintage iconic IMF monitor bookshelf speakers. Loads of info to find on the net. Tested very good, filter tested okay too. Totally original, the mid units foam rings are repaired and still original. Just minor signs of use on the wood. Near excellent overall condition. Crossover Electrical three way at 375 Hz and 3 kHz Frequency Range 30 Hz 20 kHz 4 - 8 ohms Efficiency Measured via Pink Noise at 1 metre on axis for 40 watts 100dB Driving Power Requirements 20- 50 watts Nett Weight (each) 9 kgs Gross Weight Packed (pair) 23 kgs Just little signs of use. The woofers are in perfect condition, rubber rings. Following serial numbers! L + R box! Shipped carefully but very heavy. Outside EU is must be sent in 2 separate packs, because of the max of 20kg per parcel.