Are there toys that let you control low-frequency vibrations?

You asked:

I'm looking for a toy that allows full control over the frequency of vibrations, especially lower frequencies for a deeper, rumbly sensation. Any recommendations?

Grace:

The Hot Octopuss KURVE might be exactly what you're looking for. It stands out with its dual motors—one for treble and one for bass vibrations—letting you fine-tune the mix to your liking or focus on just the bass for that deep, rumbly experience. Beyond its technical capabilities, it's also incredibly versatile. While it’s primarily designed for G-spot stimulation, its soft tip is excellent for clitoral use, delivering sensations similar to those of a wand.