Putting the JiPS-250i’s $50 price advantage aside for a moment, Altec’s and Jensen’s speakers have a lot in common. Both are made predominantly from plastic, placing two speakers inside a weighted base with a T-shaped mounting arm jutting out of the top and front. While each system is technically compatible with other Apple devices, their arms are highly specific to the size and shape of the 2010 iPad, using rigid arms that can’t…