We look at joint regular variation properties of MA(∞) processes of the form X = (X k , k ∈ Z) where X k = ∞ j=0 ψ j Z k−j and the sequence of random variables (Z i , i ∈ Z) are i.i.d. with regularly varying tails. We use the setup of M O -convergence and obtain hidden regular variation properties for X under suitable summabality conditions on the constant coefficents (ψ j : j ≥ 0). Our approach emphasizes continuity properties of mappings and produces regular variation in sequence space.

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