Dartford 1220

British flag
Dartford 1220Dartford 1220Dartford 1220Dartford 1220
  • ToneSpeak's seven year warranty logo
  • RoHS-Compliant logo
  • Made-in-Minnesota logo
  • ISO 9001-2015 certification logo
  • Klippel-verified logo

Since the earliest days of electric guitar amplification, alnico magnets have shaped the warm, dynamic tones that define blues, rock, and jazz. The Dartford 1220 continues this tradition, offering players a vintage-inspired sound with modern reliability.

This 12-inch speaker pairs a powerful 34 oz. alnico magnet with a proprietary British paper cone, delivering warm, resonant mids, punchy lows, and a signature chime in the highs. With its naturally responsive and expressive character, the Dartford 1220 enhances the depth and detail of your playing, making it an essential upgrade for musicians seeking tonal perfection.

Key Features:

  • 12-inch (305 mm), 20-Watt power handling at 8 Ω impedance
  • 99 dB SPL sensitivity for rich projection
  • 34 oz. alnico ring magnet for vintage warmth and dynamics
  • 1.75-inch copper voice coil with a paper former for authentic tone
  • Full paper cone with proprietary edge doping for enhanced response

Crafted for those who crave classic tone and expressive articulation, the Dartford 1220 transforms your amplifier into a vehicle for timeless sound.

sensitivity & impedance curves

Input: 2.83 volts measured at 1 Meter

Input: 2.83 volts measured at 1 Meter

0 deg response
30 deg response
60 deg response
impedance
  • Where to Buy
  • General Specifications
    General Specifications for the Dartford 1220 speaker
    Nominal Diameter (in & mm)12" (305 mm)
    Nominal Impedance (Z) (Ω)
    Rated Power IEC268-5 (W)20
    Program Power (W)40
    Magnet Weight (g)964
    Voice Coil Diameter (mm)45
    Sensitivity (dB SPL)99
    Frequency Range (Hz)75 - 5000
  • Small Signal Parameters
    Small Signal Parameters for the Dartford 1220 speaker
    Resonant Frequency (Fs) (Hz) +/- 15%91
    DC Resistance (Re) (Ω)5.8
    Voice Coil Inductance (Le) (mH)0.32
    Moving Mass (Mms) (gm)30.17
    Suspension Compliance (Cms) (mm/N)0.1
    Motor Force Factor (BL) (T•M)9.66
    Mechanical Q Factor (Qms)18.78
    Electrical Q Factor (Qes)1.07
    Total Q Factor (Qts)1.01
    Compliance Equivalent Volume (Vas) (L)36.55
    Surface Area of Diaphragm (Sd) (cm²)502.7
  • Material Description
    The Material Description for the Dartford 1220 speaker
    Basket TypeStamped steel
    Magnet MaterialAlnico
    Cone Body MaterialPaper (Kurt Muller)
    Cone Surround MaterialPaper (Kurt Muller)
    Dust Cap MaterialCloth
    Spider MaterialCotton
    Voice Coil Wire MaterialCopper
    Voice Coil Former MaterialPaper
    Voice Coil Winding StyleSingle Layer
  • Documents

featured demo