Railmaster DHB27 8 ohm, 2 watt, 27mm x 14.3mm(1.06” x 0.56”). Frequency range 200 – 20,000 Hz Keith 6 years ago Railmaster DHB27 8 ohm, 2 watt, 27mm x 14.3mm(1.06” x 0.56”). Frequency range 200 – 20,000 Hz