Stig Carlsson, a pair of 'Kolboxen' speakers, 1959-62.

According to information from Carlsson Planet,
bass reflex speaker in teak with built-in tube amplifiers, 4 Peerless MT20HFC mounted in a cross around the upper opening's 8-inch midrange unit, the later classic broadband Philips 9710 AM and downwards at the bottom a Peerless 10-inch bass together with the advanced amplifiers Height 95 cm.

Renovated by Åke Skans in 2019.