Bowers & Wilkins - Series 600 - DM610 - Speakers Serial numbers; 044979 / 044980 The set is in beautiful condition and has been tested working, see the extensive photo series for the right impression which is also part of the description. Specifications: Vintage: 1991 model System type: 2-way sealed box infinite baffle Power rating : 20W to 100W RMS at 8 ohms, for undistorted music, or 30W to 150W for amplifiers capable of 4 ohm load Impedance: 4 ohms nominal Dimensions [H x W x D]: 490 x 236 x 303 mm Weight: 7.8 kg each - packed ~ 9.5 kg each Will be carefully packaged and shipped with Track & Trace code.