ToneSpeak Belfast 820 - 4 Ohm 8" Guitar Speaker 20 Watt

SKU: Belfast-820

Canadian Dollar Price:
Sale price$103.99
In stock (8 units)



The Belfast 820 provides players and listeners with a well-tailored and satisfyingly clear response. This model gives your tone a defined contour⁠—open and present lows, soft mids, and glassy/articulate highs—that will make your lead and solo lines soar.

Upgrade your 8" guitar speaker cabinet with this high-sensitivity driver, combining a powerful ferrite magnet motor, a 1" copper voice coil, a paper composite cone, a pair of dual terminals for easy connectivity and installation, with a sturdy steel basket to hold it all in place.

  • 8" guitar speaker
  • 20 watts, 4 ohm
  • 10 oz ferrite magnet
  • Paper composite cone
  • 1" copper voice coil, Kraft paper former

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.

Download Product Specifications (PDF) »

More Information
Brand Name ToneSpeak
Size, Nominal (inch & mm) 8" (203 mm)
Shape of Speaker Round
Speaker Type Guitar Speaker
Application Musical Instruments
Environment Indoor
RoHS Compliant Yes
Nominal Impedance (Z) (Ω) 4
Rated Power IEC268-5 (W) 20 Watts
Rated Impedance (Ω) 4
Continuous Power (W) 20
Program Power (W) 40
Frequency Range (Hz) 88 - 11,000
Sensitivity (dB SPL) ¹ 97
Resonant Frequency (Fs) (Hz) 155
DC Resistance (Re) (Ω) 3.4
Voice Coil Inductance (Le) (mH) 0.12
Mechanical Q Factor (Qms) 15.49
Electrical Q Factor (Qes) 1.77
Total Q Factor (Qts) 1.59
Mechanical Resistance (Rms) (kg/s) 0.58
Compliance Equivalent Volume (Vas) (L) 8.31
Suspension Compliance (Cms) (mm/N) 0.11
Surface Area of Diaphragm (Sd) (cm²) 226.98
Moving Mass (Mms) (gm) 9.22
Magnetic Gap Height (mm) 6.0
Coil Winding Height (mm) 6.35
Motor Force Factor (BL) (T•M) 4.17
Efficiency (η₀) (%) 1.69
Efficiency Bandwidth Product (EBP) (Fs/Qes) 87.88
Basket Type Stamped steel with black powder coating
Terminal Size (mm) 5.2 x 0.5
Voice Coil Diameter (mm) 25.4
Voice Coil Wire Material copper
Voice Coil Former Material Kraft paper
Voice Coil Winding Style Single Layer
Magnet Material Ferrite
Magnet Weight (gm) 283.5
Cone Body Material Paper composite
Dust Cap Material Paper
Spider Material Cotton
Net Weight (kg) 1.02
Technical Notes

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

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