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

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Embrace the Legacy of Alnico

Since the early days of electric guitar amplification, alnico magnets have been revered for their warm, responsive tone. Today, they continue to be the cornerstone for musicians seeking that authentic "vintage" sound. Like our Dartford 1220, Alnico speakers excel in delivering the tonal qualities cherished by blues, rock, and jazz enthusiasts worldwide.

Meet the Dartford 1220: A Masterpiece of Sound Engineering

Our 12-inch Dartford speaker combines a powerful alnico magnet with a British paper cone to enrich your music with warm, resonant mids, punchy lows, and the classic chime of highs. This speaker isn't just a component; it's the heart of your musical expression.

  • 12" (305 mm) steel basket diameter
  • 20 watts
  • 8 ohm
  • 99 dB SPL
  • 1.75" copper, with a paper former
  • Full paper, with proprietary edge doping
  • 34 oz. alnico ring

Why Dartford 1220?

Turn your amplifier into a conduit of time-traveling sound with the Dartford 1220. Engineered for those who crave depth and detail in their music, this speaker is a testament to decades of innovation and sound perfection. ToneSpeak speakers are crafted from extensive research and dialogue with top musicians — when you choose ToneSpeak, you're choosing the pinnacle of sound excellence.

Explore a world where premium sound meets historical craftsmanship. Play the best. Play ToneSpeak.

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