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A dual frames multiplier is an operator consisting of analysis,multiplication and synthesis processes, where the analysis and the synthesisare made by two dual frames in a Hilbert space, respectively. In this paper weinvestigate the spectra of some dual frames multipliers giving, in particular,conditions to be at most countable. The contribution extends the resultsavailable in literature about the spectra of Bessel multipliers with symboldecaying to zero and of multipliers of dual Riesz bases.

On some dual frames multipliers with at most countable spectra