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RE: Multimeter with max voltage hold

You noted: "speaker is a near-perfect resistive load"

I have never heard this before. In EE, we modeled a speaker as an RLC circuit where L was a dominant factor that changes with F. However, it was not very linear (perfectly resistive). Speakers are actually quite complex... I link to a loudspeaker model below, but also of note are:

Note in this presentation how R is parabolic in nature and no where near-perfect.
Modeling Large signals in microspeakers


ST Microelectronics compensation, see pg 24

Still, to get to your original question if you want a max hold, Fluke makes a series of handheld DMMs that will hold max, min or average. (in fact the Fluke 187, Fluke 189 and Fluke 87V can do this)

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