This pair of KEF Calinda SP 1053 Speakers are in full working order, but the tops of both cabinets are stained, as shown in the picture.They have consecutive serial numbers and were bought new by my father, then passed to me twenty years ago.I am not aware of any repairs or maintenance, but wires connecting the tweeters are black on one unit and blue on the other, so perhaps this is the result of a replacement. I am selling them as a result of moving to a smaller home.A Google search reveals more information, including the specification below. Due to their size and weight I am selling on the basis of the buyer collecting, but please contact me if you would like to discuss alternative arrangements. System Type: Two-way, floor standingEnclosure Type: Passive radiatorSystem: SP1053Drive Units:Bass Unit : B200 (SP1054),Passive Radiator : BD139 (SP1042),Tweeter : T27(SP1032)Crossover: SP1055Input Impedance: 8 ?Rated Maximum Power: 100 W programmeAmplifier Requirements: 15 - 100 watts per channel into 8 ?System Resonance: 28 Hz, mechanical reflexFrequency Range: 40 - 30,000 Hz, ±3 dBSensitivity: 12.5 watts for 96 dB at 1 m and 400 Hz in anechoic conditionsCrossover Frequency: 3,500 HzInternal Volume: 45 litresFinishe: TeakGrille: Mokka brown clothDimensions (W x H x D): 700 x 280 x 350 mm (27.5 x 11 x 13.8)Weight: 19.1 kg (42 lb)