Abstract Acoustics manufactures or has manufactured the following equipment (click to expand models list):Dynamic Speakers
TAC (October 12, 2007): Abstract Acoustics was a brand from Audiosphere Technology .
Bob (October 28, 2009): Audiosphere was a Canadian brand, based in toronto. The parent company had multiple brands they sold under during the 80's and early 90's. They are generally not considered to be an audiophile speaker. Audiosphere used woofers made by the now defunct Cambridge Loudspeaker Manufacturing facility in "Cambridge" Ontario. The mids were usually of Asian descent, as were the horn tweeters.