R7 - May Cause Fire (EDM t-shirt)

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This customer received 15 t-shirt designs from 7 designers. They chose this t-shirt design from db1404 as the winning design.
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We are an EDM duo called Rubicon 7 that play and produce high-energy electro house music. We want a t-shirt design that uses "R7" and the phrase "may cause fire" along with the symbol in the attached file. The symbol is a circle with flames on top...but we want line-art headphones added to it in the same style. The overall icon can be updated/modernized, but still needs to be recognizable as a play on the original icon.
The R7 should be prominent in the design. Be creative with the "R7" portion of the design. Should be something that can stand on it's own, perhaps a stylized font instead of Arial or Helvetica.
No limit on number of colors.
Updates
Note: Be creative with the "R7" portion of the design. Should be something that can stand on it's own...not necessarily a full logo, but certainly a stylized font instead of Arial or Helvetica. Added Tuesday, March 17, 2015
Target Market(s)
EDM fans
Industry/Entity Type
House
Font styles to use
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.