The Dayton Loudspeaker Series II woofers were designed to offer a unique combination of high power handling, healthy Xmax, and good sensitivity. This allows them to work well in many different applications, including light-duty pro sound or DJ setups and home theater subwoofers. Treated heavy-duty paper cones, bumped back plates, large motors, rubber surrounds, and vented pole pieces are just a few of the features that ensure high power handling and long-term reliability. These great woofers have been field-tested and proven for over 10 years, and continue to gain popularity!

ST210-8 8" Series II Woofer Specifications

• Power handling: 180 watts RMS/250 watts max
• Voice coil diameter: 2"
• Voice coil inductance: 1.56 mH
• Nominal impedance: 8 ohms
• DC resistance: 7.5 ohms
• Frequency response: 45-3,000 Hz
• Magnet weight: 38 oz.
• Fs: 44.9 Hz
• SPL: 91.1 dB 1W/1m
• Vas: 1.34 cu. ft.
• Qms: 13.54
• Qes: .41
• Qts: .40
• Xmax: 6.4mm
• Net weight: 8 lbs.
• Dimensions:
  Overall Diameter: 8-3/16"
  Cutout Diameter: 7-3/16"
  Mounting Depth: 4"
• Magnet Diameter: 5-1/4"
• Magnet Height: 1-1/2"

ST255-8 10" Series II Woofer Specifications

• Power handling: 250 watts RMS/350 watts max
• Voice coil diameter: 2-1/2"
• Voice coil inductance: 1.23 mH
• Nominal impedance: 8 ohms
• DC resistance: 6.2 ohms
• Frequency response: 35-3,000 Hz
• Magnet weight: 56 oz.
• Fs: 34 Hz
• SPL: 91.7 dB 1W/1m
• Vas: 2.78 cu. ft.
• Qms: 9.50
• Qes: .33
• Qts: .32
• Xmax: 5.5mm
• Net weight: 12 lbs.
• Dimensions:
  Overall Diameter: 10"
  Cutout Diameter: 9"
  Mounting Depth: 4-3/4"
• Magnet Diameter: 6-1/8"
• Magnet Height: 1-1/2"

ST305-8 12" Series II Woofer Specifications

• Power handling: 275 watts RMS/380 watts max
• Voice coil diameter: 2-1/2"
• Voice coil inductance: 2.30 mH
• Nominal impedance: 8 ohms
• DC resistance: 5.7 ohms
• Frequency response: 27-2,000 Hz
• Magnet weight: 56 oz.
• Fs: 27 Hz
• SPL: 92 dB 1W/1m
• Vas: 5.70 cu. ft.
• Qms: 11.72
• Qes: .35
• Qts: .34
• Xmax: 8.0mm
• Net weight: 15 lbs.
• Dimensions: Overall Diameter: 12"
  Cutout Diameter: 11"
  Mounting Depth: 6"
• Magnet Diameter: 6-1/8"
• Magnet Height: 1-7/8"

ST385-8 15" Series II Woofer Specifications

• Power handling: 300 watts RMS/425 watts max
• Voice coil diameter: 2-1/2"
• Voice coil inductance: 4.4 mH
• Nominal impedance: 8 ohms
• DC resistance: 6.3 ohms
• Frequency response: 19-1,000 Hz
• Magnet weight: 90 oz.
• Fs: 19.0 Hz
• SPL: 89.5 dB 1W/1m
• Vas: 9.64 cu. ft.
• Qms: 10.46
• Qes: .35
• Qts: .34
• Xmax: 8.0mm
• Net weight: 19 lbs.
• Dimensions:
  Overall Diameter: 15-1/8"
  Cutout Diameter: 13-7/8"
  Mounting Depth: 6-9/16"
• Magnet Diameter: 7-5/8"
• Magnet Height: 1-7/8"