Are there any vibrators with independent frequentcy and…

With the most common design (rotating unbalanced weight) I don’t think that’s possible because increasing the power means increasing the speed of the motor, which means the frequency also increases. And I like my vibes rumbly, which means I’m stuck at low power levels

I’m not planning to put it into any holes so a wand or bullet type would be ideal (if it even exists). Thanks.

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