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“OD-111a” Omni directional loudspeaker for mounting on a wall, high power version

The design idea
The speakers are easy to place in a home due to their small measures and multiple ways to be placed. They can be placed wall hanging, standing in a bookshelf or standing on the floor.
This three way version is a larger and more potent version of the OD-11. It was designed at the same time and, as you can see, after the same ideas.
The OD- series was intended for two- or four channel stereo sound reproduction.
The bass reflex port is placed on the backside facing the wall where the feet ensure the correct distance to the wall. Stig Carlsson talked about these speakers mostly as wall hanging. Midrange and high range are tilted inwards in order to have a better stereo effect in the entire room. This design ensures small variations in sound in different positions.


Box volume: 30 litres estimated
Measures W x H x D: 40 X 40 X 30 cm

Drive units:
Woofer: 1pc. 23 cm
Midrange: 1 pc horn speaker
Tweeters: 1 pc. 5 cm 8 ohms Peerless MT 20 HFC

Cross over frequencies: 1200 and 4500 Hz

Explanations to figure:
4: Back side with feet and bass reflex port
10: Woofer
11: Mid range horn
12: Tweeter
13: Baffle
14: Concave part of baffle for woofer
15: Concave part of baffle for mid range

Martin Dellstig – Co-Editor

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