TSB-15-250

American flag
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

Input: 2.83 volts measured at 1 Meter

0 deg response
30 deg response
60 deg response
impedance

general specifications

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

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

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

featured demo