This (fire) problem seems to be centered around the sub on-board [amplifier] itself. I believe these amplifiers are designed and manufactured by a third party (possibly Bryston?).
Otherwise, I would'nt be concerned with other, conventional, speaker products (ie. C-50's, C-100's, C-200's, C-300's, C-500's, Take-Series, RC-10's, 30's, 70's, Veritas, etc.,...).
Actually, I (still) plan to purchase an RC-Sub10 (or RC-Sub12) once they re-issue them with retro-fit amplifiers. I understand they are very good.