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You are bidding on a pair of fully working Sonab OA4 Type2 Omni Direction Speakers 1970s. Condition is Used.
OA-4 was the low budget version of the 1960s great success the OA-5. The difference between these models is primarily that the OA-4 has a smaller cabinet and one tweeter less, giving a slightly degraded frequency range compared to OA-5. It also had a somewhat less robust electronic design.The model lived very much on the success of the OA-5 and was an alternative for all who couldnt afford the larger model. OA-4 looked just like the OA-5 but was smaller but the Swedish loudspeaker guru, Stig Carlsson, had made the design!
OA-4 was, like the other models from the sixties, equipped with one of the cheap but very good sounding eight inch full range units, Philips 9710 in the eight ohms version. The tweeters were also like the other models from the sixties the Peerless MT 20 HFC. Unlike the OA-5 it used only three inwards firing tweeters instead of four. The filters were of good quality and made with air cored inductors and quality capacitors.There are no real bass reflex tubes in the speaker only two round holes cut out under the box that are damped with damping material. The downside of the simplified design without port tube is something that the OA-4 has inherited from its big brother, the OA-5. This is a cheap solution to save costs in the production. Apart from this the speaker is well designed with a well braced box, quality components and a thorough design. This results in a good sound reproduction for its time.
TECHNICAL DATA SONAB OA-4 TYPE 2
According to the SONAB manual and/or HiFiHandboken
Volume: 36 litresMeasures: 24 x 49 x 43cm (W x H x D)Weight: 9 KgPrinciple: Omni-directional. Bass reflex. (Editors comment: Well. The models lack a real bass reflex tunnel. There are only two round holes in the bottom with glass wool inside, almost a like Dynaudios bass vented systems. Due to production technical reasons, was Sonabs excuse, greediness we say. Stig Carlsson never used this solution in any of the following models.)Impedance: Approx. 7 ohmFrequency range: 44-18.000 HzFrequency response: 48-15.000 Hz +/- 5 dB on the floor against a wallCross over frequency: 3500 Hz (6/12dB)Full range unit: 1 22 cm 8 ohms Philips 9710 full range unit.Tweeter: 3 pc 5 cm, Peerless MT20HFC. One 16 and two 8 ohms.Finishes: Rosewood, walnut, teak, oak and white lacquer.
Obviously there are a few marks to this pair of speakers but the work and operate perfectly I dont have any original packaging or manual But it can be safely packed for shipping Bid with confidence and thanks for looking
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Category: Sound and Vision:Home Audio and HiFi Separates:Speakers and Subwoofers
Location: Stourbridge