Dartford 1220 - 12 in. Guitar Speaker, Alnico Magnet, 20 Watt, 8 Ohm

Brand Name
ToneSpeak
Part #
86078
In stock
$299.99

Guitar speakers with alnico magnets have been around since the dawn of guitar amplification. Known for their warm tone and fast response, they have remained a mainstay among tone purists despite the advancements of more modern magnet materials. When compressed, alnico speakers can produce the most desired “vintage” tonal characteristics, and are a favorite choice for blues, rock and jazz guitarists worldwide.

The 12” Dartford guitar speaker is no exception, harnessing the magical combination of alnico with a British paper cone to produce those highly sought after warm, full and throaty mids. The moderately full lows are tight and punchy, while the highs offer the classic bell-like chime.

  • British tone guitar speaker
  • 12" (305 mm) steel basket diameter
  • 20 watts, 8 ohm, 99 dB SPL
  • 1.75" copper voice coil, paper former
  • Full paper cone
  • Proprietary edge doping
  • 34 oz. alnico ring magnet

Turn your amp into a vintage time machine with the Dartford 12” alnico guitar
speaker from ToneSpeak.

ToneSpeak guitar speakers are the result of years and years of the deep-dive for the perfect tone.  Decades of testing, field experience and conversations with elite tone-chasers have all been poured into these fine products.  When you play ToneSpeak, you play the best.

More Information
Brand Name ToneSpeak
Size, Nominal (inch & mm) 12" (305 mm)
Shape of Speaker Round
Speaker Type Guitar Speaker
Application Musical Instruments
Environment Indoor
RoHS Compliant No
Nominal Impedance (Z) (Ω) 8
Rated Power IEC268-5 (W) 20 Watts
Continuous Power (W) 20
Program Power (W) 40
Frequency Range (Hz) 75 - 5,000
Sensitivity (dB SPL) ¹ 99
Resonant Frequency (Fs) (Hz) +/- 15% 91
DC Resistance (Re) (Ω) 5.8
Voice Coil Inductance (Le) (mH) 0.32
Mechanical Q Factor (Qms) 18.78
Electrical Q Factor (Qes) 1.07
Total Q Factor (Qts) 1.01
Mechanical Resistance (Rms) (kg/s) 0.71
Compliance Equivalent Volume (Vas) (L) 36.55
Suspension Compliance (Cms) (mm/N) 0.1
Surface Area of Diaphragm (Sd) (cm²) 502.7
Moving Mass (Mms) (gm) 30.17
Motor Force Factor (BL) (T•M) 9.66
Motive Force (BL²/Re) (T•m²)/Ω) 16.09
Efficiency (η₀) (%) 2.44
Efficiency Bandwidth Product (EBP) (Fs/Qes) 84.05
Basket Type Stamped steel
Terminal Size (mm) 5.2 x 0.5 (Dual lug)
Voice Coil Diameter (mm) 44.5
Voice Coil Wire Material Copper
Voice Coil Former Material Paper
Voice Coil Winding Style Single Layer
Magnet Material Alnico
Magnet Weight (g) 963.9
Cone Body Material Paper (Kurt Muller)
Cone Surround Material Paper (Kurt Muller)
Dust Cap Material Cloth
Spider Material Cotton
Net Weight (kg) 2.72
Technical Notes

¹ Sensitivity is measured with 2.83 volt input, measured on-axis at 1 meter distance