Boston 1020

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back side of the Boston 1020
front side of the Boston 1020
terminal of the Boston 1020
side of the Boston 1020
ToneSpeak's seven year warranty logo
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Made-in-Minnesota logo
ISO 9001-2015 certification logo
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Get that classic tone of Alnico with the Boston 1020 by ToneSpeak. This 10-inch speaker brings warmth, articulation, and a touch of vintage compression that enhances your playing dynamics. With rich, full lows, scooped mids, and shimmering highs, the Boston 1020 ensures your guitar tone remains detailed and expressive across the full frequency range.

At the heart of this speaker is a classic 1960s-style 6.8 oz. Alnico magnet, designed for quick impulse response and a naturally dynamic feel. As you push the speaker, the Alnico magnet subtly compresses, delivering a smooth and musical breakup that adds an unmatched sweetness to your sound. Paired with a USA-made seamed paper cone, this speaker delivers the authentic American tone that guitarists crave.

Key Features

  • 10-inch (250 mm), 20-Watt power handling at 8 Ω impedance
  • 96 dB SPL sensitivity for a well-balanced output
  • Classic 6.8 oz. Alnico magnet for vintage compression and dynamic response
  • USA-made seamed paper cone for rich tonal character
  • 1” copper voice coil with Kraft paper former for durability and warmth

Add a touch of timeless American tone to your amp with the Boston 1020—where vintage character meets modern reliability.

sensitivity & impedance curves

Input: 2.83 volts measured at 1 Meter

frequency and impedance response graph of the ToneSpeak Leeds 1020
0 deg response
30 deg response
60 deg response
impedance

general specifications

Nominal Diameter (in & mm)10" (250 mm)
Nominal Impedance (Z) (Ω)
Rated Power IEC268-5 (W)20
Program Power (W)40
Magnet Weight (g)193
Voice Coil Diameter (mm)25
Sensitivity (dB SPL)96
Frequency Range (Hz)65 - 6300

small signal parameters

Resonant Frequency (Fs) (Hz) +/- 15%112
DC Resistance (Re) (Ω)6.2
Voice Coil Inductance (Le) (mH)0.35
Moving Mass (Mms) (gm)15.84
Suspension Compliance (Cms) (mm/N)0.1
Motor Force Factor (BL) (T•M)5.91
Mechanical Q Factor (Qms)18.38
Electrical Q Factor (Qes)1.99
Total Q Factor (Qts)1.8
Compliance Equivalent Volume (Vas) (L)28.27
Surface Area of Diaphragm (Sd) (cm²)397.61

material description

Basket TypeCold-rolled steel
Magnet MaterialAlnico
Cone Body MaterialPaper composite
Cone Surround MaterialPaper composite
Dust Cap MaterialFelt
Spider Material
Voice Coil Wire MaterialCopper
Voice Coil Former MaterialKraft paper
Voice Coil Winding StyleSingle Layer

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