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I run Howard Leight active muffs with Harbor Freight disposable foam plugs. I shoot my .454 with these no problem in an outdoor range with a 8ft awning. No way I'd do this without doubling up on the active muffs.
As some other have stated, passive muffs generally block more noise than active for the same bulk/size. You give up sound deadening material for electronics. Active muffs with the same sound deadening as passive will cost exponentially more.
And to clarify for some reading this now or in the future that don't understand how active muffs work- they don't just allow some sound in and not others. They block everything and there's a little speaker inside that transmits sound outside from a little microphone. Turning them on or off doesn't block more or less sound. They block as much as they're capable.
I can usually still hear standard conversation with foam plugs and active muffs just fine. Much better than just plugs or just passive muffs.
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