The Remo Emperor® SMT™ bass drumhead is a pre-muffled design featuring Sub Muffl® Technology. Constructed with 2-plies of 7-mil and 5-mil Clear or Coated film and an externally mounted dampening profile with free-floating acoustic foam, it enables the head and drum shell to maintain complete sound characteristics with additional attack and low-end frequencies. SMT technology allows a broad tonal spectrum of tuning ranges with controlled high and mid frequencies and deep, powerful low tones.