The Kensington GR is a high fidelity speaker -- not recommended for hard rock/heavy metal. For that you want low fidelity with excessive bass. Hard rock/heavy metal in high fidelity will make you question your self-worth, and you won't like the answer.
I was joking. I don't listen to hard rock/heavy metal so I have no idea how they would sound on my Tannoys, which BTW go down to 16Hz. It all depends on the room, not on the surround.
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