Railmaster DHB8 8 ohm, 2 watt, 28mm x 28mm x 13mm(1.1” x 1.1” x .44”). Frequency range 200 – 20,000 Hz. Keith 6 years ago Railmaster DHB8 8 ohm, 2 watt, 28mm x 28mm x 13mm(1.1” x 1.1” x .44”). Frequency range 200 – 20,000 Hz.