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Oliver Acoustic Research AR-94 specifications
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Introduction

At the winter 1998 I started to build second loudspeaker kit, a little less than a year after the first ones were finished. By that time I thought that I was more experienced and had good understanding what I was doing. That made possible to make some slight modifications such as tune it a little differently. Box size is untouched but box tuning is few herts lower than manual suggests. Original responce was very straight at free space so room would have caused few desibel boost at the region of 45 Hz. Same change was made to kit specifications two years later.

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Box structure

Creating the outlook was mainly based on acoustical aspects and only minor compromises had to be made for good outlook. Odin is made of 5 cm thick birchwood except front baffle where is the layer is about 7 cm thick. Box width is kept as small as possible to enchance stereo image. Element mounting plate is extruded about 4 cm from rest of the front baffle. It is also rounded well to diminish diffraction. Elements are flush mounted and attached with bolts.

Dynamic Loudspeakers

Thin structure, unparallel top and bottom sides and plate in the middle all reduce standing waves in the box as well as damping material. Thick walls, cross bracing and weight in bottom of the box reduce box resonances. Remaining box resonances are spread to wider frequency band by using several walls with different thicknesses. Coupling to froor is created with three spikes that eliminates conduction ofresonance to floor. Whole speaker weights about 40 kg. Apparently resonance and standing wave damping is succeeded because there is no sign of booming or annoying colourations even if listened with high levels.

Conclusions

I have been satisfied with the result. It has very good depth image and enough dynamics for most listeners. I haven't even tried to test the limits. Sound remains clear when played with high levels. Bass could have more kick but it is though very pleasant to listen.