High-quality sound and design - 3 modes of use: with support, without support on a cabinet or hanging from the ceiling. Considering that the Audiorama, each supplied with 12 speakers, transmit in all directions, no limit is applied to the positioning and the listener can be sitting almost anywhere in the room. In order not to compromise the stereo or quadraphonic effect, you should just make sure the distance among the speakers is between 2 and 4 meters, depending on the size of the room. The system has a nominal impedance of 4 ohms, so if you want to connect Audiorama speakers to devices of other manufacturers, be sure that the rated output impedance of the latter is not more than 5 ohms, to avoid damage to the output transistors. GRUNDIG Audiorama 7000 Hi-Fi technical features - Speaker: 4 woofers, 8 tweeters Volume: approx. 11 litres Music power: 70 W Nominal power: 50 W Frequency range: 45 - 20.000 Hz Impedance: 4 Ohms Crossover frequency of the built-in filter: 3500 Hz Original electric wiring - connecting cable securely attached, plug, etc. DIN 41 529 Diameter of the speaker sphere: approx. 30 cm - Height with support: approx. 81 cm Sphere speaker weight (without support): approx. 5.500 kg - with support: 6.400 gr Fair condition, with original connections and rubbers - Not tested, but previously perfectly working - Considering that the speakers are original from the 70s, surface signs of wear (some dent on the grills, repairable because being made of metal - 1 base plate broken, to be replaced, as shown in the pictures) are to be considered normal. Please, carefully look at the pictures, in order to avoid future complaints. For this large and delicate lot the pickup by the buyer would be preferable, in Naples (Italy). Shipping only prior agreement, with costs to be borne by the buyer.