Dartford 1220

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Dartford 1220Dartford 1220Dartford 1220Dartford 1220
back side of the Dartford 1220
front side of the Dartford 1220
terminal of the Dartford 1220
side of the Dartford 1220
ToneSpeak's seven year warranty logo
RoHS-Compliant logo
Made-in-Minnesota logo
ISO 9001-2015 certification logo
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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

frequency and impedance response graph of the ToneSpeak Dartford 1220
0 deg response
30 deg response
60 deg response
impedance

general specifications

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

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

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

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