TSB-15-250

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TSB-15-250TSB-15-250TSB-15-250TSB-15-250
back side of the TSB-15-250
front side of the TSB-15-250
terminal of the TSB-15-250
side of the TSB-15-250
ToneSpeak's seven year warranty logo
RoHS-Compliant logo
Made-in-Minnesota logo
ISO 9001-2015 certification logo
Klippel-verified logo

Take your bass tone to new depths with the TSB-15-250, a 15-inch bass guitar speaker engineered for power, clarity, and rich low-end response. Designed with a 7 oz. neodymium magnet, this speaker delivers massive tone while maintaining a lightweight build, making it an ideal choice for gigging bassists and professional setups.

With 250 watts AES and 500 watts program power handling, the TSB-15-250 provides deep, controlled bass with a smooth midrange and articulate highs. The 2.5-inch inside/outside copper voice coil, wound on a fiberglass former, ensures optimal heat dissipation and reliability, even during extended play. A paper cone with a cloth M-roll surround enhances the warmth and resonance needed for a full, immersive bass sound.

Key Features:

  • 15-inch (381 mm) bass guitar speaker with pressed steel frame
  • 250 watts AES / 500 watts program power handling
  • 7 oz. neodymium magnet for high-powered, lightweight performance
  • 2.5-inch inside/outside wound copper voice coil with fiberglass former
  • Paper cone with cloth M-roll surround for deep, resonant bass
  • High sensitivity (98.5 dB SPL) for superior projection

For bassists looking for a speaker that delivers both thunderous lows and balanced clarity, the TSB-15-250 offers the perfect combination of power and performance.

sensitivity & impedance curves

Input: 2.83 volts measured at 1 Meter

frequency and impedance response graph of the ToneSpeak of the TSB-15-250
0 deg response
30 deg response
60 deg response
impedance

general specifications

Nominal Diameter (in & mm)15" (381 mm)
Nominal Impedance (Z) (Ω)
Rated Power IEC268-5 (W)250
Program Power (W)500
Magnet Weight (g)198.4
Voice Coil Diameter (mm)63.5
Sensitivity (dB SPL)98.5
Frequency Range (Hz)45 - 4000

small signal parameters

Resonant Frequency (Fs) (Hz) +/- 15%38
DC Resistance (Re) (Ω)5.7
Voice Coil Inductance (Le) (mH)0.51
Moving Mass (Mms) (gm)73.3
Suspension Compliance (Cms) (mm/N)0.24
Motor Force Factor (BL) (T•M)15.1
Mechanical Q Factor (Qms)10.24
Electrical Q Factor (Qes)0.43
Total Q Factor (Qts)0.42
Compliance Equivalent Volume (Vas) (L)251
Surface Area of Diaphragm (Sd) (cm²)855.34

material description

Basket TypePressed steel
Magnet MaterialNeodymium
Cone Body MaterialPaper
Cone Surround MaterialCloth
Dust Cap MaterialFelt
Spider Material
Voice Coil Wire MaterialCopper
Voice Coil Former MaterialFiberglass
Voice Coil Winding StyleInside / Outside

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