In a two-dimensional magnetic recording (TDMR) system, a first finite impulse response (FIR) filter processes data read from a track of a magnetic medium by a first head using first filter tap values determined a priori independently of a second head. A second FIR filter processes data read from a track by the second head using second filter tap values determined a priori independently of the first head. An off-track detector detects whether one or more of the first and second heads is off of the tracks being read. A gain controller controls gains for the first and second FIR filters based on whether one or more of the first and second heads is off of the tracks being read.