TSB-12-250

American flag
TSB-12-250TSB-12-250TSB-12-250TSB-12-250
back side of the TSB-12-250
front side of the TSB-12-250
terminal of the TSB-12-250
side of the TSB-12-250
ToneSpeak's seven year warranty logo
RoHS-Compliant logo
Made-in-Minnesota logo
ISO 9001-2015 certification logo
Klippel-verified logo

Elevate your bass performance with the TSB-12-250, a 12-inch bass guitar speaker designed to deliver deep, punchy lows with excellent clarity and responsiveness. Engineered with a 7 oz. neodymium magnet, this speaker provides rich, resonant tone while keeping the overall weight low for easy portability.

With 250 watts AES and 500 watts program power handling, the TSB-12-250 ensures tight, controlled bass, smooth mids, and articulate highs. Its 2.5-inch inside/outside copper voice coil, wound on a fiberglass former, enhances heat dissipation for consistent performance under demanding conditions. The paper cone with a cloth M-roll surround further refines the balance between warmth and precision.

Key Features:

  • 12-inch (304.8 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, controlled bass
  • High sensitivity (98 dB SPL) for excellent projection

For bassists seeking power, clarity, and portability, the TSB-12-250 delivers a balanced, dynamic tone with the durability needed for any performance.

sensitivity & impedance curves

Input: 2.83 volts measured at 1 Meter

frequency and impedance response graph of the ToneSpeak TSB-12-250
0 deg response
30 deg response
60 deg response
impedance

general specifications

Nominal Diameter (in & mm)12" (305 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
Frequency Range (Hz)50 -4000

small signal parameters

Resonant Frequency (Fs) (Hz) +/- 15%45
DC Resistance (Re) (Ω)5.6
Voice Coil Inductance (Le) (mH)0.53
Moving Mass (Mms) (gm)48.4
Suspension Compliance (Cms) (mm/N)0.26
Motor Force Factor (BL) (T•M)14.9
Mechanical Q Factor (Qms)8.54
Electrical Q Factor (Qes)0.34
Total Q Factor (Qts)0.33
Compliance Equivalent Volume (Vas) (L)104.23
Surface Area of Diaphragm (Sd) (cm²)530.93

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