Google makes it easy to find good vocabulary. In regards to Ebay, you would be better off ordering direct from Axioms Factory Outlet. In most cases, the price is about the same. Besides you get the full warranty and Axiom's great customer service backing. Many have found after they bought on Ebay that they payed close to the same price they could have received direct from Axiom, besides Axiom has no shipping.

http://www.axiomaudio.com/factoryoutlet.html

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