I Sonab Sweden OD 11, Speakers, tested in beautiful condition and in working condition, with some use tracks, these speakers are for the demanding listener of quality music of any genre. They are omnidirectional speakers that have been designed to be directed upwards and create an incredibly lifelike sound image. The imagery is fantastic and the details are sensational. The units are 26 cm x 26 cm x 26 cm, have an internal volume of 10 litres and each weigh 6 kg. They have a frequency range of 45 Hz to 18,000 Hz and are and 8 ohm 2-way bass reflex design. The woofer is a 6.5 inch Peerless crossover to the tweeter at 1,800 Hz. Designed and made in Sweden by Stig Carlsson in 1978, but they are also exciting to listen to and can be placed almost anywhere, on their side on a bookshelf or on the ground with the front facing up! These units are very efficient and only need an amplifier of 40 watts per channel. However, the better the amplifier, the better the sound...